feat: close preprod observability loop

.gitea/workflows/deploy-socialize.yml

@@ -0,0 +1,75 @@
+name: deploy-socialize
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  image:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Docker CLI
+        run: apt-get update && apt-get install -y docker.io
+      - name: Login to Gitea container registry
+        env:
+          REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
+          REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
+        run: printf '%s' "$REGISTRY_PASSWORD" | docker login git.mapachotes.com -u "$REGISTRY_USER" --password-stdin
+      - name: Build images
+        run: |
+          docker build \
+            -t git.mapachotes.com/jbourdon/socialize-api:${{ gitea.sha }} \
+            -t git.mapachotes.com/jbourdon/socialize-api:latest \
+            -f backend/src/Socialize.Api/Dockerfile .
+          docker build \
+            --build-arg VITE_API_URL=/ \
+            -t git.mapachotes.com/jbourdon/socialize-web:${{ gitea.sha }} \
+            -t git.mapachotes.com/jbourdon/socialize-web:latest \
+            -f frontend/Dockerfile .
+      - name: Push images
+        run: |
+          docker push git.mapachotes.com/jbourdon/socialize-api:${{ gitea.sha }}
+          docker push git.mapachotes.com/jbourdon/socialize-api:latest
+          docker push git.mapachotes.com/jbourdon/socialize-web:${{ gitea.sha }}
+          docker push git.mapachotes.com/jbourdon/socialize-web:latest
+
+  deploy:
+    needs: image
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install SSH client
+        run: apt-get update && apt-get install -y openssh-client
+      - name: Deploy on sobina
+        env:
+          DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}
+          DEPLOY_USER: ${{ secrets.DEPLOY_USER }}
+          DEPLOY_SSH_PRIVATE_KEY_B64: ${{ secrets.DEPLOY_SSH_PRIVATE_KEY_B64 }}
+          SOCIALIZE_IMAGE_TAG: ${{ gitea.sha }}
+        run: |
+          : "${SOCIALIZE_IMAGE_TAG:?SOCIALIZE_IMAGE_TAG is required}"
+
+          mkdir -p ~/.ssh
+          printf '%s' "$DEPLOY_SSH_PRIVATE_KEY_B64" | base64 -d > ~/.ssh/deploy_key
+          chmod 600 ~/.ssh/deploy_key
+
+          write_env_value() {
+            key="$1"
+            value="$2"
+            escaped_value="$(printf '%s' "$value" | sed "s/'/'\\\\''/g")"
+            printf "%s='%s'\n" "$key" "$escaped_value"
+          }
+
+          deploy_env="$(mktemp)"
+          {
+            write_env_value SOCIALIZE_IMAGE_TAG "$SOCIALIZE_IMAGE_TAG"
+          } > "$deploy_env"
+
+          scp -i ~/.ssh/deploy_key -o StrictHostKeyChecking=accept-new "$deploy_env" "$DEPLOY_USER@$DEPLOY_HOST:/srv/prod/socialize/.deploy.env"
+          rm -f "$deploy_env"
+          scp -i ~/.ssh/deploy_key -o StrictHostKeyChecking=accept-new deploy/compose.yml "$DEPLOY_USER@$DEPLOY_HOST:/srv/prod/socialize/compose.yml"
+
+          ssh -i ~/.ssh/deploy_key -o StrictHostKeyChecking=accept-new "$DEPLOY_USER@$DEPLOY_HOST" \
+            'test -r /etc/socialize/socialize.env && cd /srv/prod/socialize && ./deploy.sh'

.github/workflows/backend-ci.yml

@@ -1,39 +0,0 @@
-name: Backend CI/CD
-
-on:
-  push:
-    branches: 
-      - main
-
-env:
-  AZURE_WEBAPP_NAME: hutopy-backend-api
-  DOTNET_VERSION: '10.0.x'
-
-jobs:
-  build_and_deploy:
-    runs-on: ubuntu-latest
-    environment: dev
-    steps:
-
-      # Checkout the repository
-      - uses: actions/checkout@v2
-
-      # Setup .NET Core
-      - name: Setup .NET Core
-        uses: actions/setup-dotnet@v1
-        with:
-          dotnet-version: ${{ env.DOTNET_VERSION }}
-
-      # Run dotnet publish
-      - name: dotnet build and publish
-        run: |
-          cd backend
-          dotnet publish --configuration Release --artifacts-path ./publish/ Socialize.slnx
-
-      # Deploy to Azure WebApp
-      - name: Deploy to Azure WebApp
-        uses: azure/webapps-deploy@v2
-        with:
-          app-name: ${{ env.AZURE_WEBAPP_NAME }} 
-          publish-profile: ${{ secrets.AZURE_WEBAPP_PUBLISH_PROFILE }}
-          package: './backend/publish/publish/Socialize.Api/release/'

.github/workflows/frontend-ci.yml

@@ -1,38 +0,0 @@
-name: Frontend CI/CD
-
-on:
-  push:
-    branches:
-      - main 
-
-env:
-  AZURE_SWA_NAME: hutopy-portal
-
-jobs:
-  build_and_deploy:
-    runs-on: ubuntu-latest
-    steps:
-      
-      # Checkout the repository
-      - uses: actions/checkout@v2
-     
-      # Npm install
-      - name: npm install
-        run: |
-          cd frontend
-          npm install
-      
-      # Npm run build
-      - name: npm run build
-        run: |
-          cd frontend
-          npm run build
-
-      # Deploy to Azure SWA
-      - name: Deploy to Azure SWA
-        uses: azure/static-web-apps-deploy@v1
-        with:
-          action: "upload"
-          app_location: 'frontend'
-          output_location: 'dist'
-          azure_static_web_apps_api_token: ${{ secrets.AZURE_SWA_TOKEN }}

.gitignore

@@ -22,6 +22,10 @@ Thumbs.db
 # .NET
 bin/
 obj/
+**/[Bb]in/
+**/[Oo]bj/
+**/[Bb]in[\\]*
+**/[Oo]bj[\\]*
 TestResults/
 
 # Node
@@ -30,6 +34,7 @@ dist/
 .vite/
 
 # Local environment files
+.env
 *.local
 .env.local
 .env.*.local
@@ -38,5 +43,11 @@ App_Data/
 # Local SSL certificates
 *.pem
 
-# Ai
+# AI agent local state
+.agents
+.agents/
 .codex
+.codex/
+
+# Generated local artifacts
+.artifacts/

README.md

@@ -76,6 +76,47 @@ http://localhost:8080
 http://<this-machine-lan-ip>:8080
 ```
 
+For preprod deployment, configure the `POSTGRES_PASSWORD`, `RESEND_API_KEY`,
+`RESEND_FROM_EMAIL`, and `JWT_SIGNING_KEY` Gitea secrets.
+The deploy workflow writes the remote `.env` file and syncs `deploy/compose.yml`
+before running the server deploy script.
+Use the raw Resend API key value for `RESEND_API_KEY`, without a `Bearer ` prefix.
+
+## Preprod Observability
+
+The optional observability overlay runs a self-hosted Grafana stack for preproduction:
+
+- Grafana `13.0.1`: dashboards
+- Prometheus `v3.11.3`: metrics and local alert rules
+- Loki `3.7.1`: Docker/container logs
+- Tempo `2.10.3`: traces
+- Grafana Alloy `v1.16.0`: OTLP receiver and Docker log collector
+
+Start the app with observability:
+
+```bash
+docker compose -f deploy/compose.yml -f deploy/observability/compose.observability.yml up -d
+```
+
+Grafana is exposed at:
+
+```txt
+http://127.0.0.1:3000
+```
+
+Default credentials are `admin` / `admin` unless `GRAFANA_ADMIN_USER` and
+`GRAFANA_ADMIN_PASSWORD` are set. Set `GRAFANA_HTTP_BIND=0.0.0.0` only when the
+preprod network boundary is trusted or protected by a reverse proxy/VPN.
+
+Set a non-default `GRAFANA_ADMIN_PASSWORD` before exposing Grafana outside the
+host. Prometheus alert rules are provisioned under
+`deploy/observability/prometheus/rules/`; notification delivery is intentionally
+left to the preprod operations environment.
+
+Set `ALERTMANAGER_WEBHOOK_URL` to route alerts to a private notification endpoint.
+See `docs/OPERATIONS/observability-runbook.md` for bring-up, alert triage, and
+the optional protected Caddy configuration for Grafana.
+
 ## Solution
 
 ```bash
@@ -90,6 +131,24 @@ cd frontend
 npm run build
 ```
 
+## Database Diagram
+
+Start PostgreSQL, then generate a local schema diagram:
+
+```bash
+./scripts/generate-db-diagram.sh
+```
+
+The script writes an HTML viewer, SVG, PNG, and Graphviz source under:
+
+```txt
+.artifacts/db-diagrams/
+```
+
+Use `DATABASE_URL`, `PGPASSWORD`, or `~/.pgpass` to provide local database credentials.
+When using the repository infrastructure script, the diagram script can read from the
+running `socialize-postgres` container directly.
+
 ## Agentic Workflow
 
 Start here:

backend/.github/workflows/build.yml

@@ -1,82 +0,0 @@
-name: Build
-
-on:
-  pull_request:
-    branches: [ main ]
-    paths-ignore:
-      - '.scripts/**'
-      - .gitignore
-      - CODE_OF_CONDUCT.md
-      - LICENSE
-      - README.md
-
-  workflow_call:
-    inputs:
-      build-artifacts:
-        type: boolean
-        required: true
-        default: false
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v3
-      name: Checkout code
-
-    - name: Cache NuGet packages
-      uses: actions/cache@v3
-      with:
-        path: ~/.nuget/packages
-        key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
-        restore-keys: |
-          ${{ runner.os }}-nuget-
-
-
-    - name: Install .NET
-      uses: actions/setup-dotnet@v3
-
-    - name: Restore solution
-      run: dotnet restore
-
-    - name: Build solution
-      run: dotnet build --no-restore --configuration Release
-      
-    - name: Test solution
-      run: dotnet test --no-build --configuration Release --filter "FullyQualifiedName!~AcceptanceTests"
-
-    - name: Publish website
-      if: ${{ inputs.build-artifacts == true }}
-      run: |
-        dotnet publish --configuration Release --runtime win-x86 --self-contained --output ./publish
-        cd publish
-        zip -r ./publish.zip .
-      working-directory: ./src/Web/
-
-    - name: Upload website artifact (website)
-      if: ${{ inputs.build-artifacts == true }}
-      uses: actions/upload-artifact@v3
-      with:
-        name: website
-        path: ./src/Web/publish/publish.zip
-        if-no-files-found: error
-    
-    - name: Create EF Core migrations bundle
-      if: ${{ inputs.build-artifacts == true }}
-      run: |
-        dotnet new tool-manifest
-        dotnet tool install dotnet-ef
-        dotnet ef migrations bundle --configuration Release -p ./src/Infrastructure/ -s ./src/Web/ -o efbundle.exe
-        zip -r ./efbundle.zip efbundle.exe
-      env:
-        SkipNSwag: True
-
-    - name: Upload EF Core migrations bundle artifact (efbundle)
-      if: ${{ inputs.build-artifacts == true }}
-      uses: actions/upload-artifact@v3
-      with:
-        name: efbundle
-        path: ./efbundle.zip
-        if-no-files-found: error

backend/.github/workflows/cicd.yml

@@ -1,42 +0,0 @@
-name: CICD
-
-on: 
-  push:
-    branches: [ main ]
-    paths-ignore:
-      - .gitignore
-      - CODE_OF_CONDUCT.md
-      - LICENSE
-      - README.md
-
-permissions:
-  id-token: write
-  contents: read
-
-jobs:
-
-  build:
-    uses: ./.github/workflows/build.yml
-    with:
-      build-artifacts: true
-
-  deploy-development:
-    uses: ./.github/workflows/deploy.yml
-    secrets: inherit
-    needs: [ build ]
-    with:
-      environmentName: Development
-
-  deploy-staging:
-    uses: ./.github/workflows/deploy.yml
-    secrets: inherit
-    needs: [ deploy-development ]
-    with:
-      environmentName: Staging
-
-  deploy-production:
-    uses: ./.github/workflows/deploy.yml
-    secrets: inherit
-    needs: [ deploy-staging ]
-    with:
-      environmentName: Production

backend/.github/workflows/deploy.yml

@@ -1,107 +0,0 @@
-name: Deploy
-
-on:
-  workflow_call:
-    inputs:
-      environmentName:
-        required: true
-        type: string
-
-permissions:
-  id-token: write
-  contents: read
-
-jobs:
-  
-  validate:
-     runs-on: ubuntu-latest
-     environment: ${{ inputs.environmentName }}
-
-     steps: 
-
-     - uses: actions/checkout@v3
-       name: Checkout code
-
-     - uses: azure/login@v1
-       name: Login to Azure
-       with:
-         client-id: ${{ vars.AZURE_CLIENT_ID }}
-         tenant-id: ${{ vars.AZURE_TENANT_ID }}
-         subscription-id: ${{ vars.AZURE_SUBSCRIPTION_ID }}
-
-     - if: inputs.environmentName == 'Development'
-       uses: azure/arm-deploy@v1
-       name: Run preflight validation
-       with:
-         deploymentName: ${{ github.run_number }}
-         resourceGroupName: ${{ vars.AZURE_RESOURCE_GROUP_NAME }}
-         template: ./.azure/bicep/main.bicep
-         parameters: >
-           environmentName=${{ inputs.environmentName }}
-           sqlAdministratorUsername=${{ vars.AZURE_SQL_ADMINISTRATOR_USERNAME }}
-           sqlAdministratorPassword=${{ secrets.AZURE_SQL_ADMINISTRATOR_PASSWORD }}
-           projectName=${{ vars.PROJECT_NAME }}
-         deploymentMode: Validate
-
-     - if: inputs.environmentName != 'Development'
-       uses: azure/arm-deploy@v1
-       name: Run what-if
-       with:
-         failOnStdErr: false
-         resourceGroupName: ${{ vars.AZURE_RESOURCE_GROUP_NAME }}
-         template: ./.azure/bicep/main.bicep
-         parameters: >
-           environmentName=${{ inputs.environmentName }}
-           sqlAdministratorUsername=${{ vars.AZURE_SQL_ADMINISTRATOR_USERNAME }}
-           sqlAdministratorPassword=${{ secrets.AZURE_SQL_ADMINISTRATOR_PASSWORD }}
-           projectName=${{ vars.PROJECT_NAME }}
-         additionalArguments: --what-if
- 
-  deploy:
-    needs: [ validate ]
-    runs-on: ubuntu-latest
-    environment: ${{ inputs.environmentName }}
-
-    steps:
-
-    - uses: actions/checkout@v3
-      name: Checkout code
-
-    - uses: actions/download-artifact@v3
-      name: Download artifacts
-
-    - name: Install .NET
-      uses: actions/setup-dotnet@v3
-
-    - uses: azure/login@v1
-      name: Login to Azure
-      with:
-        client-id: ${{ vars.AZURE_CLIENT_ID }}
-        tenant-id: ${{ vars.AZURE_TENANT_ID }}
-        subscription-id: ${{ vars.AZURE_SUBSCRIPTION_ID }}
-
-    - uses: azure/arm-deploy@v1
-      id: deploy
-      name: Deploy infrastructure
-      with:
-        failOnStdErr: false
-        deploymentName: ${{ github.run_number }}
-        resourceGroupName: ${{ vars.AZURE_RESOURCE_GROUP_NAME }}
-        template: ./.azure/bicep/main.bicep
-        parameters: >
-           environmentName=${{ inputs.environmentName }}
-           sqlAdministratorUsername=${{ vars.AZURE_SQL_ADMINISTRATOR_USERNAME }}
-           sqlAdministratorPassword=${{ secrets.AZURE_SQL_ADMINISTRATOR_PASSWORD }}
-           projectName=${{ vars.PROJECT_NAME }}
-
-    - name: Initialise database
-      run: |
-        unzip -o ./efbundle/efbundle.zip
-        echo '{ "ConnectionStrings": { "DefaultConnection": "" } }' > appsettings.json
-        ./efbundle.exe --connection "Server=${{ steps.deploy.outputs.sqlServerFullyQualifiedDomainName }};Initial Catalog=${{ steps.deploy.outputs.sqlDatabaseName }};Persist Security Info=False;User ID=${{ vars.AZURE_SQL_ADMINISTRATOR_USERNAME }};Password=${{ secrets.AZURE_SQL_ADMINISTRATOR_PASSWORD }};MultipleActiveResultSets=False;Encrypt=True;TrustServerCertificate=False;Connection Timeout=30;" --verbose
-
-    - uses: azure/webapps-deploy@v2
-      name: Deploy website
-      with:
-        app-name: ${{ steps.deploy.outputs.appServiceAppName }}
-        package: website/publish.zip

backend/src/Socialize.Api/ApplicationRegistration.cs

@@ -1,5 +1,6 @@
 using System.Text;
 using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Observability;
 using Socialize.Api.Infrastructure.Security;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.AspNetCore.Authentication;
@@ -11,7 +12,7 @@ using Microsoft.IdentityModel.Tokens;
 
 namespace Socialize;
 
-public static class DependencyInjection
+internal static class ApplicationRegistration
 {
     public static IServiceCollection AddWebServices(this IServiceCollection services)
     {
@@ -20,7 +21,10 @@ public static class DependencyInjection
         services.AddHttpContextAccessor();
 
         services.AddHealthChecks()
-            .AddDbContextCheck<AppDbContext>();
+            .AddCheck("self", () => Microsoft.Extensions.Diagnostics.HealthChecks.HealthCheckResult.Healthy(), tags: ["live"])
+            .AddDbContextCheck<AppDbContext>("postgres", tags: ["ready"])
+            .AddCheck<LocalBlobStorageHealthCheck>("local_blob_storage", tags: ["ready"])
+            .AddCheck<EmailerConfigurationHealthCheck>("emailer_configuration", tags: ["ready"]);
 
         services.AddHttpClient();
         services.AddScoped<AccessScopeService>();
@@ -70,7 +74,6 @@ public static class DependencyInjection
         {
             authenticationBuilder.AddJwtBearer(JwtBearerDefaults.AuthenticationScheme, jwtBearerOptions =>
             {
-                jwtBearerOptions.Authority = "https://hutopy.com";
                 jwtBearerOptions.TokenValidationParameters = new TokenValidationParameters
                 {
                     ValidateIssuer = true,
@@ -79,7 +82,7 @@ public static class DependencyInjection
                     ValidAudience = authJwt["Audience"],
                     ValidateLifetime = true,
                     IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(authJwt["Key"] ??
-                        throw new ArgumentNullException("The Jwt Key is missing.")))
+                        throw new InvalidOperationException("Authentication:Jwt:Key is required.")))
                 };
             });
         }
@@ -90,9 +93,9 @@ public static class DependencyInjection
             authenticationBuilder.AddGoogle(GoogleDefaults.AuthenticationScheme, options =>
             {
                 options.ClientId = authGoogle["ClientId"] ??
-                                   throw new ArgumentNullException("The Google ClientId is missing.");
+                                   throw new InvalidOperationException("Authentication:Google:ClientId is required.");
                 options.ClientSecret = authGoogle["ClientSecret"] ??
-                                       throw new ArgumentNullException("The Google ClientSecret is missing.");
+                                       throw new InvalidOperationException("Authentication:Google:ClientSecret is required.");
             });
         }
 
@@ -102,9 +105,9 @@ public static class DependencyInjection
             authenticationBuilder.AddFacebook(FacebookDefaults.AuthenticationScheme, options =>
             {
                 options.ClientId = authFacebook["ClientId"] ??
-                                   throw new ArgumentNullException("The Facebook ClientId is missing.");
+                                   throw new InvalidOperationException("Authentication:Facebook:ClientId is required.");
                 options.ClientSecret = authFacebook["ClientSecret"] ??
-                                       throw new ArgumentNullException("The Facebook ClientSecret is missing.");
+                                       throw new InvalidOperationException("Authentication:Facebook:ClientSecret is required.");
             });
         }
 

backend/src/Socialize.Api/Common/Domain/Entity.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Common.Domain;
 
-public abstract class Entity
+internal abstract class Entity
 {
     public Guid Id { get; init; }
     public Guid CreatedBy { get; init; }

backend/src/Socialize.Api/Data/AppDbContext.cs

@@ -10,16 +10,21 @@ using Socialize.Api.Modules.Feedback.Data;
 using Socialize.Api.Modules.Identity.Data;
 using Socialize.Api.Modules.Notifications.Data;
 using Socialize.Api.Modules.Campaigns.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Data;
 using Socialize.Api.Modules.Organizations.Data;
+using Socialize.Api.Modules.ReleaseCommunications.Data;
 using Socialize.Api.Modules.Workspaces.Data;
 
 namespace Socialize.Api.Data;
 
-public class AppDbContext(
+internal class AppDbContext(
     DbContextOptions<AppDbContext> options)
     : IdentityDbContext<User, Role, Guid>(options)
 {
     public DbSet<Organization> Organizations => Set<Organization>();
+    public DbSet<OrganizationMembershipTier> OrganizationMembershipTiers => Set<OrganizationMembershipTier>();
+    public DbSet<OrganizationMembershipTierTranslation> OrganizationMembershipTierTranslations =>
+        Set<OrganizationMembershipTierTranslation>();
     public DbSet<OrganizationMembership> OrganizationMemberships => Set<OrganizationMembership>();
     public DbSet<Workspace> Workspaces => Set<Workspace>();
     public DbSet<WorkspaceInvite> WorkspaceInvites => Set<WorkspaceInvite>();
@@ -28,6 +33,7 @@ public class AppDbContext(
     public DbSet<Campaign> Campaigns => Set<Campaign>();
     public DbSet<ContentItem> ContentItems => Set<ContentItem>();
     public DbSet<ContentItemRevision> ContentItemRevisions => Set<ContentItemRevision>();
+    public DbSet<ContentItemActivityEntry> ContentItemActivityEntries => Set<ContentItemActivityEntry>();
     public DbSet<Asset> Assets => Set<Asset>();
     public DbSet<AssetRevision> AssetRevisions => Set<AssetRevision>();
     public DbSet<Comment> Comments => Set<Comment>();
@@ -41,6 +47,14 @@ public class AppDbContext(
     public DbSet<FeedbackScreenshot> FeedbackScreenshots => Set<FeedbackScreenshot>();
     public DbSet<FeedbackComment> FeedbackComments => Set<FeedbackComment>();
     public DbSet<FeedbackActivityEntry> FeedbackActivityEntries => Set<FeedbackActivityEntry>();
+    public DbSet<CalendarSource> CalendarSources => Set<CalendarSource>();
+    public DbSet<CalendarCatalogEntry> CalendarCatalogEntries => Set<CalendarCatalogEntry>();
+    public DbSet<CalendarEvent> CalendarEvents => Set<CalendarEvent>();
+    public DbSet<UserCalendarExportFeed> UserCalendarExportFeeds => Set<UserCalendarExportFeed>();
+    public DbSet<ReleaseUpdate> ReleaseUpdates => Set<ReleaseUpdate>();
+    public DbSet<ReleaseUpdateReadReceipt> ReleaseUpdateReadReceipts => Set<ReleaseUpdateReadReceipt>();
+    public DbSet<ReleaseCommit> ReleaseCommits => Set<ReleaseCommit>();
+    public DbSet<ReleaseUpdateEmailDigestReceipt> ReleaseUpdateEmailDigestReceipts => Set<ReleaseUpdateEmailDigestReceipt>();
 
     protected override void OnModelCreating(ModelBuilder builder)
     {
@@ -57,5 +71,7 @@ public class AppDbContext(
         builder.ConfigureApprovalsModule();
         builder.ConfigureNotificationsModule();
         builder.ConfigureFeedbackModule();
+        builder.ConfigureCalendarIntegrationsModule();
+        builder.ConfigureReleaseCommunicationsModule();
     }
 }

backend/src/Socialize.Api/Folder.DotSettings

@@ -1,5 +0,0 @@
-<wpf:ResourceDictionary xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-                        xmlns:s="clr-namespace:System;assembly=mscorlib"
-                        xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-                        xml:space="preserve">
-	<s:Boolean x:Key="/Default/UserDictionary/Words/=hutopy/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

backend/src/Socialize.Api/Infrastructure/BlobStorage/Configuration/LocalBlobStorageOptions.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Infrastructure.BlobStorage.Configuration;
 
-public sealed class LocalBlobStorageOptions
+internal sealed class LocalBlobStorageOptions
 {
     public const string SectionName = "LocalBlobStorage";
 

backend/src/Socialize.Api/Infrastructure/BlobStorage/Contracts/CommonFileNames.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Infrastructure.BlobStorage.Contracts;
 
-public static class CommonFileNames
+internal static class CommonFileNames
 {
     public const string ProfilePicture = "profilePicture";
     public const string LogoPicture = "logoPicture";

backend/src/Socialize.Api/Infrastructure/BlobStorage/Contracts/ContainerNames.cs

@@ -4,6 +4,7 @@ internal static class ContainerNames
 {
     public const string Users = "users";
     public const string Clients = "clients";
+    public const string Organizations = "organizations";
     public const string Workspaces = "workspaces";
     public const string Creators = "creators";
     public const string Feedback = "feedback";

backend/src/Socialize.Api/Infrastructure/BlobStorage/Contracts/ContentTypes.cs

@@ -2,7 +2,7 @@
 
 namespace Socialize.Api.Infrastructure.BlobStorage.Contracts;
 
-public static class ContentTypes
+internal static class ContentTypes
 {
     private const string ImagePng = "image/png";
     private const string ImageJpeg = "image/jpeg";
@@ -39,6 +39,6 @@ public static class ContentTypes
 
         // Check for HTML content by looking for "<!DOCTYPE html>" or "<html>" tags
         string content = Encoding.UTF8.GetString(buffer);
-        return content.Contains("<!DOCTYPE html>");
+        return content.Contains("<!DOCTYPE html>", StringComparison.OrdinalIgnoreCase);
     }
 }

backend/src/Socialize.Api/Infrastructure/BlobStorage/Contracts/IBlobStorage.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Infrastructure.BlobStorage.Contracts;
 
-public interface IBlobStorage
+internal interface IBlobStorage
 {
     /// <summary>
     ///     Upload a file to blob storage.

backend/src/Socialize.Api/Infrastructure/BlobStorage/Contracts/SubDirectoryNames.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Infrastructure.BlobStorage.Contracts;
 
-public static class SubDirectoryNames
+internal static class SubDirectoryNames
 {
     public const string Profile = "profile";
     public const string Contents = "contents";

backend/src/Socialize.Api/Infrastructure/BlobStorage/Services/LocalBlobStorage.cs

@@ -1,19 +1,29 @@
 using Microsoft.Extensions.Options;
 using Socialize.Api.Infrastructure.BlobStorage.Configuration;
 using Socialize.Api.Infrastructure.BlobStorage.Contracts;
+using Socialize.Api.Infrastructure.Observability;
 
 namespace Socialize.Api.Infrastructure.BlobStorage.Services;
 
-public sealed class LocalBlobStorage(
+internal sealed class LocalBlobStorage(
     IWebHostEnvironment environment,
     IHttpContextAccessor httpContextAccessor,
     IOptions<LocalBlobStorageOptions> options,
-    ILogger<LocalBlobStorage> logger)
+    ILogger<LocalBlobStorage> logger,
+    SocializeMetrics metrics)
     : IBlobStorage
 {
     private const long MaxUploadSize = 10 * 1024 * 1024;
     private const string ContentTypeMetadataSuffix = ".content-type";
 
+    private static readonly char[] PathSeparators = [Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar];
+
+    private static readonly Action<ILogger, string, string, string, string, Exception?> LogUploadedFile =
+        LoggerMessage.Define<string, string, string, string>(
+            LogLevel.Information,
+            new EventId(1, nameof(UploadFileAsync)),
+            "Blob storage: Uploaded [{BlobName}] to local container [{ContainerName}] with contentType [{ContentType}] and uri [{FileUri}]");
+
     private readonly LocalBlobStorageOptions _options = options.Value;
 
     public async Task<string> UploadFileAsync(
@@ -23,37 +33,51 @@ public sealed class LocalBlobStorage(
         string contentType,
         CancellationToken ct = default)
     {
-        stream.Position = 0;
+        try
-
-        if (stream.Length > MaxUploadSize)
         {
-            logger.LogError("Blob storage: File size exceeds the maximum allowed size of {MaxUploadSize} bytes.", MaxUploadSize);
+            stream.Position = 0;
-            throw new InvalidOperationException($"Blob storage: File size exceeds the maximum allowed size of {MaxUploadSize} bytes.");
-        }
 
-        if (!ContentTypes.IsAllowed(contentType, stream))
+            if (stream.Length > MaxUploadSize)
+            {
+                logger.LogError("Blob storage: File size exceeds the maximum allowed size of {MaxUploadSize} bytes.", MaxUploadSize);
+                throw new InvalidOperationException($"Blob storage: File size exceeds the maximum allowed size of {MaxUploadSize} bytes.");
+            }
+
+            if (!ContentTypes.IsAllowed(contentType, stream))
+            {
+                logger.LogError("Blob storage: Unsupported file type {ContentType}.", contentType);
+                throw new InvalidOperationException("Unsupported file type.");
+            }
+
+            string relativePath = GetSafeRelativePath(containerName, blobName);
+            string filePath = Path.Combine(GetRootPath(), relativePath);
+            Directory.CreateDirectory(Path.GetDirectoryName(filePath) ?? GetRootPath());
+
+            await using FileStream fileStream = File.Create(filePath);
+            await stream.CopyToAsync(fileStream, ct);
+            await File.WriteAllTextAsync(GetContentTypeMetadataPath(filePath), contentType, ct);
+
+            string fileUri = BuildPublicUrl(relativePath);
+            LogUploadedFile(logger, blobName, containerName, contentType, fileUri, null);
+            metrics.RecordBlobStorageOperation("upload", true);
+
+            return fileUri;
+        }
+        catch (InvalidOperationException)
         {
-            logger.LogError("Blob storage: Unsupported file type {ContentType}.", contentType);
+            metrics.RecordBlobStorageOperation("upload", false);
-            throw new InvalidOperationException("Unsupported file type.");
+            throw;
+        }
+        catch (IOException)
+        {
+            metrics.RecordBlobStorageOperation("upload", false);
+            throw;
+        }
+        catch (UnauthorizedAccessException)
+        {
+            metrics.RecordBlobStorageOperation("upload", false);
+            throw;
         }
-
-        string relativePath = GetSafeRelativePath(containerName, blobName);
-        string filePath = Path.Combine(GetRootPath(), relativePath);
-        Directory.CreateDirectory(Path.GetDirectoryName(filePath) ?? GetRootPath());
-
-        await using FileStream fileStream = File.Create(filePath);
-        await stream.CopyToAsync(fileStream, ct);
-        await File.WriteAllTextAsync(GetContentTypeMetadataPath(filePath), contentType, ct);
-
-        string fileUri = BuildPublicUrl(relativePath);
-        logger.LogInformation(
-            "Blob storage: Uploaded [{BlobName}] to local container [{ContainerName}] with contentType [{ContentType}] and uri [{FileUri}]",
-            blobName,
-            containerName,
-            contentType,
-            fileUri);
-
-        return fileUri;
     }
 
     public async Task<MemoryStream> DownloadFileAsync(
@@ -61,19 +85,43 @@ public sealed class LocalBlobStorage(
         string blobName,
         CancellationToken ct = default)
     {
-        string filePath = Path.Combine(GetRootPath(), GetSafeRelativePath(containerName, blobName));
+        try
-
-        if (!File.Exists(filePath))
         {
-            throw new FileNotFoundException("Blob storage: Local file was not found.", blobName);
+            string filePath = Path.Combine(GetRootPath(), GetSafeRelativePath(containerName, blobName));
+
+            if (!File.Exists(filePath))
+            {
+                throw new FileNotFoundException("Blob storage: Local file was not found.", blobName);
+            }
+
+            MemoryStream memoryStream = new();
+            await using FileStream fileStream = File.OpenRead(filePath);
+            await fileStream.CopyToAsync(memoryStream, ct);
+            memoryStream.Position = 0;
+            metrics.RecordBlobStorageOperation("download", true);
+
+            return memoryStream;
+        }
+        catch (InvalidOperationException)
+        {
+            metrics.RecordBlobStorageOperation("download", false);
+            throw;
+        }
+        catch (FileNotFoundException)
+        {
+            metrics.RecordBlobStorageOperation("download", false);
+            throw;
+        }
+        catch (IOException)
+        {
+            metrics.RecordBlobStorageOperation("download", false);
+            throw;
+        }
+        catch (UnauthorizedAccessException)
+        {
+            metrics.RecordBlobStorageOperation("download", false);
+            throw;
         }
-
-        MemoryStream memoryStream = new();
-        await using FileStream fileStream = File.OpenRead(filePath);
-        await fileStream.CopyToAsync(memoryStream, ct);
-        memoryStream.Position = 0;
-
-        return memoryStream;
     }
 
     internal string GetRootPath()
@@ -106,7 +154,7 @@ public sealed class LocalBlobStorage(
             throw new InvalidOperationException("Blob storage: Blob paths must be relative.");
         }
 
-        string[] pathParts = [containerName, .. blobName.Split([Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar])];
+        string[] pathParts = [containerName, .. blobName.Split(PathSeparators)];
         if (pathParts.Any(part => part is "" or "." or ".."))
         {
             throw new InvalidOperationException("Blob storage: Blob paths must not contain relative path segments.");
@@ -135,7 +183,7 @@ public sealed class LocalBlobStorage(
             ? "/api/storage"
             : requestPath.Trim();
 
-        return normalized.StartsWith("/", StringComparison.Ordinal)
+        return normalized.StartsWith('/')
             ? normalized.TrimEnd('/')
             : $"/{normalized.TrimEnd('/')}";
     }

backend/src/Socialize.Api/Infrastructure/Configuration/WebsiteOptions.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Infrastructure.Configuration;
 
-public class WebsiteOptions
+internal class WebsiteOptions
 {
     public const string SectionName = "Website";
 

backend/src/Socialize.Api/Infrastructure/Development/DevelopmentSeedOptions.cs

@@ -1,8 +0,0 @@
-namespace Socialize.Api.Infrastructure.Development;
-
-public record DevelopmentSeedOptions
-{
-    public const string SectionName = "DevelopmentSeed";
-
-    public bool Enabled { get; init; } = true;
-}

backend/src/Socialize.Api/Infrastructure/Emailer/Configuration/EmailerOptions.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Infrastructure.Emailer.Configuration;
 
-public class EmailerOptions
+internal class EmailerOptions
 {
     public const string ConfigurationSection = "Emailer";
 

backend/src/Socialize.Api/Infrastructure/Emailer/Contracts/IEmailSender.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Infrastructure.Emailer.Contracts;
 
-public interface IEmailSender
+internal interface IEmailSender
 {
     Task SendEmailAsync(string email, string subject, string message);
 }

backend/src/Socialize.Api/Infrastructure/Emailer/Services/LoggerEmailSender.cs

@@ -1,22 +1,24 @@
 using Socialize.Api.Infrastructure.Emailer.Contracts;
+using Socialize.Api.Infrastructure.Observability;
 
 namespace Socialize.Api.Infrastructure.Emailer.Services;
 
-public class LoggerEmailSender(ILogger<IEmailSender> logger)
+internal class LoggerEmailSender(
+    ILogger<IEmailSender> logger,
+    SocializeMetrics metrics)
     : IEmailSender
 {
-    public async Task SendEmailAsync(string email, string subject, string message)
+    private static readonly Action<ILogger, string, string, string, string, Exception?> LogDevelopmentEmail =
+        LoggerMessage.Define<string, string, string, string>(
+            LogLevel.Information,
+            new EventId(1, nameof(SendEmailAsync)),
+            "Development email to {Email} with subject {Subject}:{NewLine}{Message}");
+
+    public Task SendEmailAsync(string email, string subject, string message)
     {
-        try
+        LogDevelopmentEmail(logger, email, subject, Environment.NewLine, message, null);
-        {
+        metrics.RecordEmailDelivery("logger", true);
-            logger.LogInformation("Sending email to {Email} with subject: {Subject}", email, subject);
+
-            await Task.Delay(1000);
+        return Task.CompletedTask;
-            logger.LogInformation("Email sent successfully to {Email}", email);
-        }
-        catch (Exception ex)
-        {
-            logger.LogError(ex, "Failed to send email to {Email}", email);
-            throw;
-        }
     }
 }

backend/src/Socialize.Api/Infrastructure/Emailer/Services/PostmarkEmailSender.cs

@@ -5,7 +5,7 @@ using PostmarkDotNet;
 
 namespace Socialize.Api.Infrastructure.Emailer.Services;
 
-public class PostmarkEmailSender : IEmailSender
+internal class PostmarkEmailSender : IEmailSender
 {
     private readonly PostmarkClient _client;
     private readonly EmailerOptions _options;

backend/src/Socialize.Api/Infrastructure/Emailer/Services/ResendEmailSender.cs

@@ -3,44 +3,95 @@ using System.Text;
 using System.Text.Json;
 using Socialize.Api.Infrastructure.Emailer.Configuration;
 using Socialize.Api.Infrastructure.Emailer.Contracts;
+using Socialize.Api.Infrastructure.Observability;
 using Microsoft.Extensions.Options;
 
 namespace Socialize.Api.Infrastructure.Emailer.Services;
 
-public class ResendEmailSender : IEmailSender
+internal class ResendEmailSender : IEmailSender
 {
     private static readonly Uri EndpointUri = new("https://api.resend.com/emails");
     private readonly HttpClient _httpClient;
+    private readonly SocializeMetrics _metrics;
     private readonly EmailerOptions _options;
 
     public ResendEmailSender(
         IHttpClientFactory httpClientFactory,
-        IOptions<EmailerOptions> options)
+        IOptions<EmailerOptions> options,
+        SocializeMetrics metrics)
     {
         _httpClient = httpClientFactory.CreateClient();
+        _metrics = metrics;
         _options = options.Value;
 
+        string apiKey = NormalizeApiKey(_options.ApiKey);
+        string fromEmail = _options.FromEmail?.Trim() ?? string.Empty;
+
+        if (string.IsNullOrWhiteSpace(apiKey))
+        {
+            throw new InvalidOperationException("Emailer:ApiKey is required when using Resend email delivery.");
+        }
+
+        if (string.IsNullOrWhiteSpace(fromEmail))
+        {
+            throw new InvalidOperationException("Emailer:FromEmail is required when using Resend email delivery.");
+        }
+
+        _options.ApiKey = apiKey;
+        _options.FromEmail = fromEmail;
+
         _httpClient.DefaultRequestHeaders.Authorization =
-            new AuthenticationHeaderValue("Bearer", _options.ApiKey);
+            new AuthenticationHeaderValue("Bearer", apiKey);
 
         _httpClient.DefaultRequestHeaders.Accept.Add(
             new MediaTypeWithQualityHeaderValue("application/json"));
     }
 
-    public async Task SendEmailAsync(string toEmail, string subject, string htmlMessage)
+    public async Task SendEmailAsync(string email, string subject, string message)
     {
-        var payload = new { from = _options.FromEmail, to = toEmail, subject, html = htmlMessage };
+        var payload = new { from = _options.FromEmail, to = email, subject, html = message };
 
         string json = JsonSerializer.Serialize(payload);
-        StringContent content = new(json, Encoding.UTF8, "application/json");
+        using StringContent content = new(json, Encoding.UTF8, "application/json");
-
+        try
-        HttpResponseMessage response = await _httpClient.PostAsync(EndpointUri, content);
-
-        if (!response.IsSuccessStatusCode)
         {
-            string body = await response.Content.ReadAsStringAsync();
+            using HttpResponseMessage response = await _httpClient.PostAsync(EndpointUri, content);
-            throw new InvalidOperationException(
+
-                $"Resend email failed: {response.StatusCode} - {body}");
+            if (!response.IsSuccessStatusCode)
+            {
+                string body = await response.Content.ReadAsStringAsync();
+                throw new InvalidOperationException(
+                    $"Resend email failed: {response.StatusCode} - {body}");
+            }
+
+            _metrics.RecordEmailDelivery("resend", true);
+        }
+        catch (HttpRequestException)
+        {
+            _metrics.RecordEmailDelivery("resend", false);
+            throw;
+        }
+        catch (TaskCanceledException)
+        {
+            _metrics.RecordEmailDelivery("resend", false);
+            throw;
+        }
+        catch (InvalidOperationException)
+        {
+            _metrics.RecordEmailDelivery("resend", false);
+            throw;
         }
     }
+
+    private static string NormalizeApiKey(string? apiKey)
+    {
+        string normalized = apiKey?.Trim().Trim('"', '\'') ?? string.Empty;
+        const string bearerPrefix = "Bearer ";
+        if (normalized.StartsWith(bearerPrefix, StringComparison.OrdinalIgnoreCase))
+        {
+            normalized = normalized[bearerPrefix.Length..].Trim();
+        }
+
+        return normalized;
+    }
 }

backend/src/Socialize.Api/Infrastructure/InfrastructureRegistration.cs

@@ -9,7 +9,7 @@ using Socialize.Api.Infrastructure.Payments.Stripe.Configuration;
 
 namespace Socialize.Api.Infrastructure;
 
-public static class DependencyInjection
+internal static class InfrastructureRegistration
 {
     public static WebApplicationBuilder AddInfrastructureModule(
         this WebApplicationBuilder builder)
@@ -26,8 +26,14 @@ public static class DependencyInjection
 
         builder.Services.Configure<EmailerOptions>(
             builder.Configuration.GetSection(EmailerOptions.ConfigurationSection));
-        builder.Services.AddTransient<IEmailSender, ResendEmailSender>();
+        if (builder.Environment.IsDevelopment())
-        //builder.Services.AddTransient<IEmailSender, EmailSender>();
+        {
+            builder.Services.AddTransient<IEmailSender, LoggerEmailSender>();
+        }
+        else
+        {
+            builder.Services.AddTransient<IEmailSender, ResendEmailSender>();
+        }
 
         builder.Services.AddHttpClient();
 

backend/src/Socialize.Api/Infrastructure/Observability/EmailerConfigurationHealthCheck.cs

@@ -0,0 +1,29 @@
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using Microsoft.Extensions.Options;
+using Socialize.Api.Infrastructure.Emailer.Configuration;
+
+namespace Socialize.Api.Infrastructure.Observability;
+
+internal sealed class EmailerConfigurationHealthCheck(
+    IWebHostEnvironment environment,
+    IOptions<EmailerOptions> options)
+    : IHealthCheck
+{
+    public Task<HealthCheckResult> CheckHealthAsync(
+        HealthCheckContext context,
+        CancellationToken cancellationToken = default)
+    {
+        if (environment.IsDevelopment())
+        {
+            return Task.FromResult(HealthCheckResult.Healthy("Development email sender logs email instead of delivering it."));
+        }
+
+        EmailerOptions value = options.Value;
+        if (string.IsNullOrWhiteSpace(value.ApiKey) || string.IsNullOrWhiteSpace(value.FromEmail))
+        {
+            return Task.FromResult(HealthCheckResult.Unhealthy("Emailer API key or from address is missing."));
+        }
+
+        return Task.FromResult(HealthCheckResult.Healthy("Emailer configuration is present."));
+    }
+}

backend/src/Socialize.Api/Infrastructure/Observability/LocalBlobStorageHealthCheck.cs

@@ -0,0 +1,40 @@
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using Microsoft.Extensions.Options;
+using Socialize.Api.Infrastructure.BlobStorage.Configuration;
+using Socialize.Api.Infrastructure.BlobStorage.Services;
+
+namespace Socialize.Api.Infrastructure.Observability;
+
+internal sealed class LocalBlobStorageHealthCheck(
+    LocalBlobStorage blobStorage,
+    IOptions<LocalBlobStorageOptions> options)
+    : IHealthCheck
+{
+    public async Task<HealthCheckResult> CheckHealthAsync(
+        HealthCheckContext context,
+        CancellationToken cancellationToken = default)
+    {
+        string rootPath = blobStorage.GetRootPath();
+        if (string.IsNullOrWhiteSpace(options.Value.RequestPath))
+        {
+            return HealthCheckResult.Unhealthy("Local blob storage request path is not configured.");
+        }
+
+        try
+        {
+            Directory.CreateDirectory(rootPath);
+            string probePath = Path.Combine(rootPath, ".healthcheck");
+            await File.WriteAllTextAsync(
+                probePath,
+                DateTimeOffset.UtcNow.ToString("O", System.Globalization.CultureInfo.InvariantCulture),
+                cancellationToken);
+            File.Delete(probePath);
+
+            return HealthCheckResult.Healthy("Local blob storage is writable.");
+        }
+        catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
+        {
+            return HealthCheckResult.Unhealthy("Local blob storage is not writable.", ex);
+        }
+    }
+}

backend/src/Socialize.Api/Infrastructure/Observability/ObservabilityRegistration.cs

@@ -0,0 +1,162 @@
+using System.Text.Json;
+using Microsoft.AspNetCore.Diagnostics.HealthChecks;
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using Npgsql;
+using OpenTelemetry.Logs;
+using OpenTelemetry.Metrics;
+using OpenTelemetry.Resources;
+using OpenTelemetry.Trace;
+
+namespace Socialize.Api.Infrastructure.Observability;
+
+internal static class ObservabilityRegistration
+{
+    private const string DefaultServiceName = "socialize-api";
+
+    public static WebApplicationBuilder AddObservability(this WebApplicationBuilder builder)
+    {
+        string serviceName = GetConfigurationValue(builder.Configuration, "OTEL_SERVICE_NAME", DefaultServiceName);
+        string serviceVersion = typeof(Program).Assembly.GetName().Version?.ToString() ?? "unknown";
+
+        builder.Logging.Configure(options =>
+        {
+            options.ActivityTrackingOptions =
+                ActivityTrackingOptions.TraceId |
+                ActivityTrackingOptions.SpanId |
+                ActivityTrackingOptions.ParentId;
+        });
+
+        builder.Logging.AddJsonConsole(options =>
+        {
+            options.IncludeScopes = true;
+            options.TimestampFormat = "yyyy-MM-ddTHH:mm:ss.fffZ";
+            options.UseUtcTimestamp = true;
+            options.JsonWriterOptions = new JsonWriterOptions { Indented = false };
+        });
+
+        bool otlpEnabled = HasOtlpEndpoint(builder.Configuration);
+        if (otlpEnabled)
+        {
+            builder.Logging.AddOpenTelemetry(options =>
+            {
+                options.IncludeFormattedMessage = true;
+                options.IncludeScopes = true;
+                options.ParseStateValues = true;
+                options.SetResourceBuilder(BuildResource(serviceName, serviceVersion));
+                options.AddOtlpExporter();
+            });
+        }
+
+        builder.Services.AddSingleton<SocializeMetrics>();
+        builder.Services.AddHostedService<WorkflowHealthSamplerService>();
+        builder.Services
+            .AddOpenTelemetry()
+            .ConfigureResource(resource => resource.AddService(
+                serviceName,
+                serviceVersion: serviceVersion))
+            .WithTracing(tracing =>
+            {
+                tracing
+                    .AddSource(SocializeMetrics.ActivitySourceName)
+                    .AddAspNetCoreInstrumentation(options =>
+                    {
+                        options.RecordException = true;
+                    })
+                    .AddHttpClientInstrumentation()
+                    .AddNpgsql();
+
+                if (otlpEnabled)
+                {
+                    tracing.AddOtlpExporter();
+                }
+            })
+            .WithMetrics(metrics =>
+            {
+                metrics
+                    .AddMeter(SocializeMetrics.MeterName)
+                    .AddAspNetCoreInstrumentation()
+                    .AddHttpClientInstrumentation()
+                    .AddRuntimeInstrumentation();
+
+                if (otlpEnabled)
+                {
+                    metrics.AddOtlpExporter();
+                }
+            });
+
+        return builder;
+    }
+
+    public static IApplicationBuilder UseObservabilityLoggingScope(this IApplicationBuilder app)
+    {
+        return app.UseMiddleware<RequestLoggingScopeMiddleware>();
+    }
+
+    public static IEndpointRouteBuilder MapObservabilityHealthChecks(this IEndpointRouteBuilder endpoints)
+    {
+        endpoints.MapHealthChecks(
+            "/health",
+            new HealthCheckOptions { ResponseWriter = WriteHealthResponseAsync });
+        endpoints.MapHealthChecks(
+            "/health/live",
+            new HealthCheckOptions
+            {
+                Predicate = registration => registration.Tags.Contains("live", StringComparer.Ordinal),
+                ResponseWriter = WriteHealthResponseAsync,
+            });
+        endpoints.MapHealthChecks(
+            "/health/ready",
+            new HealthCheckOptions
+            {
+                Predicate = registration => registration.Tags.Contains("ready", StringComparer.Ordinal),
+                ResponseWriter = WriteHealthResponseAsync,
+            });
+
+        return endpoints;
+    }
+
+    private static ResourceBuilder BuildResource(string serviceName, string serviceVersion)
+    {
+        return ResourceBuilder.CreateDefault().AddService(
+            serviceName,
+            serviceVersion: serviceVersion);
+    }
+
+    private static bool HasOtlpEndpoint(ConfigurationManager configuration)
+    {
+        return !string.IsNullOrWhiteSpace(configuration["OTEL_EXPORTER_OTLP_ENDPOINT"]) ||
+               !string.IsNullOrWhiteSpace(configuration["Otlp:Endpoint"]);
+    }
+
+    private static string GetConfigurationValue(
+        ConfigurationManager configuration,
+        string key,
+        string fallback)
+    {
+        string? value = configuration[key];
+        return string.IsNullOrWhiteSpace(value) ? fallback : value;
+    }
+
+    private static async Task WriteHealthResponseAsync(HttpContext context, HealthReport report)
+    {
+        context.Response.ContentType = "application/json";
+
+        var response = new
+        {
+            status = report.Status.ToString(),
+            checks = report.Entries.Select(entry => new
+            {
+                name = entry.Key,
+                status = entry.Value.Status.ToString(),
+                description = entry.Value.Description,
+                duration = entry.Value.Duration.TotalMilliseconds,
+            }),
+            duration = report.TotalDuration.TotalMilliseconds,
+        };
+
+        await JsonSerializer.SerializeAsync(
+            context.Response.Body,
+            response,
+            cancellationToken: context.RequestAborted);
+    }
+}

backend/src/Socialize.Api/Infrastructure/Observability/RequestLoggingScopeMiddleware.cs

@@ -0,0 +1,61 @@
+using System.Diagnostics;
+using Socialize.Api.Infrastructure.Security;
+
+namespace Socialize.Api.Infrastructure.Observability;
+
+internal sealed class RequestLoggingScopeMiddleware(
+    RequestDelegate next,
+    ILogger<RequestLoggingScopeMiddleware> logger)
+{
+    public async Task InvokeAsync(HttpContext context)
+    {
+        Dictionary<string, object?> scope = new()
+        {
+            ["trace_id"] = Activity.Current?.TraceId.ToString() ?? context.TraceIdentifier,
+            ["span_id"] = Activity.Current?.SpanId.ToString(),
+            ["http.method"] = context.Request.Method,
+            ["url.path"] = context.Request.Path.Value,
+        };
+
+        if (context.User.Identity?.IsAuthenticated == true)
+        {
+            scope["user.id"] = context.User.GetUserId();
+            scope["user.email"] = context.User.GetEmail();
+        }
+
+        AddGuidIfPresent(scope, "organization.id", context, "organizationId");
+        AddGuidIfPresent(scope, "workspace.id", context, "workspaceId");
+        AddGuidIfPresent(scope, "client.id", context, "clientId");
+        AddGuidIfPresent(scope, "campaign.id", context, "campaignId");
+        AddGuidIfPresent(scope, "content_item.id", context, "contentItemId");
+
+        using IDisposable? _ = logger.BeginScope(scope);
+        await next(context);
+    }
+
+    private static void AddGuidIfPresent(
+        Dictionary<string, object?> scope,
+        string scopeKey,
+        HttpContext context,
+        string requestKey)
+    {
+        string? value = GetRouteOrQueryValue(context, requestKey);
+        if (Guid.TryParse(value, out Guid id))
+        {
+            scope[scopeKey] = id;
+        }
+    }
+
+    private static string? GetRouteOrQueryValue(HttpContext context, string key)
+    {
+        object? routeValue = context.Request.RouteValues[key];
+        if (routeValue is not null)
+        {
+            return Convert.ToString(routeValue, System.Globalization.CultureInfo.InvariantCulture);
+        }
+
+        return context.Request.Query.TryGetValue(key, out Microsoft.Extensions.Primitives.StringValues queryValue)
+            ? queryValue.ToString()
+            : null;
+    }
+}

backend/src/Socialize.Api/Infrastructure/Observability/SocializeMetrics.cs

@@ -0,0 +1,258 @@
+using System.Diagnostics;
+using System.Diagnostics.Metrics;
+
+namespace Socialize.Api.Infrastructure.Observability;
+
+internal sealed class SocializeMetrics : IDisposable
+{
+    public const string MeterName = "Socialize.Api";
+    public const string ActivitySourceName = "Socialize.Api";
+
+    private readonly Counter<long> _approvalDecisionCounter;
+    private readonly Counter<long> _backgroundJobRunCounter;
+    private readonly Counter<long> _blobStorageOperationCounter;
+    private readonly Counter<long> _commentCreatedCounter;
+    private readonly Counter<long> _contentItemCreatedCounter;
+    private readonly Counter<long> _emailDeliveryCounter;
+    private readonly Counter<long> _feedbackSubmittedCounter;
+    private readonly Counter<long> _loginAttemptCounter;
+    private readonly Counter<long> _organizationCreatedCounter;
+    private readonly Counter<long> _workspaceCreatedCounter;
+    private readonly Counter<long> _workspaceInviteCreatedCounter;
+    private readonly object _workflowHealthLock = new();
+    private WorkflowHealthSnapshot _workflowHealthSnapshot = WorkflowHealthSnapshot.Empty;
+
+    public SocializeMetrics()
+    {
+        Meter = new Meter(MeterName);
+        ActivitySource = new ActivitySource(ActivitySourceName);
+
+        _loginAttemptCounter = Meter.CreateCounter<long>(
+            "socialize.login.attempts",
+            description: "Login attempts partitioned by outcome.");
+        _organizationCreatedCounter = Meter.CreateCounter<long>(
+            "socialize.organizations.created",
+            description: "Organizations created.");
+        _workspaceCreatedCounter = Meter.CreateCounter<long>(
+            "socialize.workspaces.created",
+            description: "Workspaces created.");
+        _contentItemCreatedCounter = Meter.CreateCounter<long>(
+            "socialize.content_items.created",
+            description: "Content items created.");
+        _commentCreatedCounter = Meter.CreateCounter<long>(
+            "socialize.comments.created",
+            description: "Comments created.");
+        _approvalDecisionCounter = Meter.CreateCounter<long>(
+            "socialize.approval_decisions.submitted",
+            description: "Approval decisions submitted.");
+        _feedbackSubmittedCounter = Meter.CreateCounter<long>(
+            "socialize.feedback.submitted",
+            description: "Feedback reports submitted.");
+        _workspaceInviteCreatedCounter = Meter.CreateCounter<long>(
+            "socialize.workspace_invites.created",
+            description: "Workspace invites created.");
+        _emailDeliveryCounter = Meter.CreateCounter<long>(
+            "socialize.email.delivery",
+            description: "Email delivery attempts partitioned by outcome and provider.");
+        _blobStorageOperationCounter = Meter.CreateCounter<long>(
+            "socialize.blob_storage.operations",
+            description: "Blob storage operations partitioned by operation and outcome.");
+        _backgroundJobRunCounter = Meter.CreateCounter<long>(
+            "socialize.background_job.runs",
+            description: "Background job runs partitioned by job and outcome.");
+
+        Meter.CreateObservableGauge(
+            "socialize.workflow.content_items",
+            ObserveContentItemCounts,
+            description: "Current content item counts by status.");
+        Meter.CreateObservableGauge(
+            "socialize.workflow.feedback_reports",
+            ObserveFeedbackReportCounts,
+            description: "Current feedback report counts by status.");
+        Meter.CreateObservableGauge(
+            "socialize.workflow.pending_invites",
+            ObservePendingInviteCount,
+            description: "Current pending workspace invite count.");
+        Meter.CreateObservableGauge(
+            "socialize.workflow.stale_in_approval",
+            ObserveStaleApprovalCount,
+            description: "Current count of content items in approval longer than the configured stale threshold.");
+        Meter.CreateObservableGauge(
+            "socialize.workflow.active_workspaces",
+            ObserveActiveWorkspaceCounts,
+            description: "Current active workspace counts by observation window.");
+    }
+
+    public Meter Meter { get; }
+
+    public ActivitySource ActivitySource { get; }
+
+    public void RecordLoginAttempt(bool succeeded, string reason)
+    {
+        _loginAttemptCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("outcome", succeeded ? "success" : "failure"),
+            new KeyValuePair<string, object?>("reason", reason));
+    }
+
+    public void RecordOrganizationCreated(Guid organizationId)
+    {
+        _organizationCreatedCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("organization.id", organizationId));
+    }
+
+    public void RecordWorkspaceCreated(Guid organizationId, Guid workspaceId)
+    {
+        _workspaceCreatedCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("organization.id", organizationId),
+            new KeyValuePair<string, object?>("workspace.id", workspaceId));
+    }
+
+    public void RecordContentItemCreated(Guid workspaceId)
+    {
+        _contentItemCreatedCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("workspace.id", workspaceId));
+    }
+
+    public void RecordCommentCreated(Guid workspaceId, bool hasAttachment)
+    {
+        _commentCreatedCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("workspace.id", workspaceId),
+            new KeyValuePair<string, object?>("has_attachment", hasAttachment));
+    }
+
+    public void RecordApprovalDecisionSubmitted(Guid workspaceId, string decision)
+    {
+        _approvalDecisionCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("workspace.id", workspaceId),
+            new KeyValuePair<string, object?>("decision", decision));
+    }
+
+    public void RecordFeedbackSubmitted(string type, Guid? workspaceId)
+    {
+        _feedbackSubmittedCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("feedback.type", type),
+            new KeyValuePair<string, object?>("workspace.id", workspaceId?.ToString() ?? "none"));
+    }
+
+    public void RecordWorkspaceInviteCreated(Guid workspaceId, string role)
+    {
+        _workspaceInviteCreatedCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("workspace.id", workspaceId),
+            new KeyValuePair<string, object?>("role", role));
+    }
+
+    public void RecordEmailDelivery(string provider, bool succeeded)
+    {
+        _emailDeliveryCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("provider", provider),
+            new KeyValuePair<string, object?>("outcome", succeeded ? "success" : "failure"));
+    }
+
+    public void RecordBlobStorageOperation(string operation, bool succeeded)
+    {
+        _blobStorageOperationCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("operation", operation),
+            new KeyValuePair<string, object?>("outcome", succeeded ? "success" : "failure"));
+    }
+
+    public void RecordBackgroundJobRun(string job, bool succeeded)
+    {
+        _backgroundJobRunCounter.Add(
+            1,
+            new KeyValuePair<string, object?>("job", job),
+            new KeyValuePair<string, object?>("outcome", succeeded ? "success" : "failure"));
+    }
+
+    public void UpdateWorkflowHealth(WorkflowHealthSnapshot snapshot)
+    {
+        lock (_workflowHealthLock)
+        {
+            _workflowHealthSnapshot = snapshot;
+        }
+    }
+
+    public void Dispose()
+    {
+        Meter.Dispose();
+        ActivitySource.Dispose();
+    }
+
+    private Measurement<int>[] ObserveContentItemCounts()
+    {
+        WorkflowHealthSnapshot snapshot = GetWorkflowHealthSnapshot();
+        return snapshot.ContentItemsByStatus
+            .Select(pair => new Measurement<int>(
+                pair.Value,
+                new KeyValuePair<string, object?>("status", pair.Key)))
+            .ToArray();
+    }
+
+    private Measurement<int>[] ObserveFeedbackReportCounts()
+    {
+        WorkflowHealthSnapshot snapshot = GetWorkflowHealthSnapshot();
+        return snapshot.FeedbackReportsByStatus
+            .Select(pair => new Measurement<int>(
+                pair.Value,
+                new KeyValuePair<string, object?>("status", pair.Key)))
+            .ToArray();
+    }
+
+    private Measurement<int> ObservePendingInviteCount()
+    {
+        return new Measurement<int>(GetWorkflowHealthSnapshot().PendingInviteCount);
+    }
+
+    private Measurement<int> ObserveStaleApprovalCount()
+    {
+        return new Measurement<int>(GetWorkflowHealthSnapshot().StaleInApprovalCount);
+    }
+
+    private Measurement<int>[] ObserveActiveWorkspaceCounts()
+    {
+        WorkflowHealthSnapshot snapshot = GetWorkflowHealthSnapshot();
+        return
+        [
+            new Measurement<int>(
+                snapshot.ActiveWorkspaces24Hours,
+                new KeyValuePair<string, object?>("window", "24h")),
+            new Measurement<int>(
+                snapshot.ActiveWorkspaces7Days,
+                new KeyValuePair<string, object?>("window", "7d")),
+        ];
+    }
+
+    private WorkflowHealthSnapshot GetWorkflowHealthSnapshot()
+    {
+        lock (_workflowHealthLock)
+        {
+            return _workflowHealthSnapshot;
+        }
+    }
+}
+
+internal sealed record WorkflowHealthSnapshot(
+    IReadOnlyDictionary<string, int> ContentItemsByStatus,
+    IReadOnlyDictionary<string, int> FeedbackReportsByStatus,
+    int PendingInviteCount,
+    int StaleInApprovalCount,
+    int ActiveWorkspaces24Hours,
+    int ActiveWorkspaces7Days)
+{
+    public static WorkflowHealthSnapshot Empty { get; } = new(
+        new Dictionary<string, int>(StringComparer.Ordinal),
+        new Dictionary<string, int>(StringComparer.Ordinal),
+        0,
+        0,
+        0,
+        0);
+}

backend/src/Socialize.Api/Infrastructure/Observability/WorkflowHealthSamplerService.cs

@@ -0,0 +1,102 @@
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Modules.Feedback.Data;
+using Socialize.Api.Modules.Workspaces.Data;
+
+namespace Socialize.Api.Infrastructure.Observability;
+
+internal sealed class WorkflowHealthSamplerService(
+    IServiceScopeFactory scopeFactory,
+    SocializeMetrics metrics,
+    ILogger<WorkflowHealthSamplerService> logger)
+    : BackgroundService
+{
+    private static readonly TimeSpan SampleInterval = TimeSpan.FromMinutes(5);
+    private static readonly TimeSpan StaleApprovalThreshold = TimeSpan.FromDays(3);
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        await SampleAsync(stoppingToken);
+
+        using PeriodicTimer timer = new(SampleInterval);
+        while (!stoppingToken.IsCancellationRequested)
+        {
+            try
+            {
+                await timer.WaitForNextTickAsync(stoppingToken);
+                await SampleAsync(stoppingToken);
+            }
+            catch (OperationCanceledException ex) when (stoppingToken.IsCancellationRequested)
+            {
+                logger.LogDebug(ex, "Workflow health sampler stopped.");
+            }
+        }
+    }
+
+    private async Task SampleAsync(CancellationToken stoppingToken)
+    {
+        try
+        {
+            using IServiceScope scope = scopeFactory.CreateScope();
+            AppDbContext dbContext = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+            DateTimeOffset now = DateTimeOffset.UtcNow;
+            DateTimeOffset staleApprovalCutoff = now.Subtract(StaleApprovalThreshold);
+            DateTimeOffset active24HourCutoff = now.AddHours(-24);
+            DateTimeOffset active7DayCutoff = now.AddDays(-7);
+
+            Dictionary<string, int> contentItemsByStatus = await dbContext.ContentItems
+                .GroupBy(item => item.Status)
+                .Select(group => new { Status = group.Key, Count = group.Count() })
+                .ToDictionaryAsync(group => group.Status, group => group.Count, StringComparer.Ordinal, stoppingToken);
+
+            Dictionary<string, int> feedbackReportsByStatus = await dbContext.FeedbackReports
+                .GroupBy(report => report.Status)
+                .Select(group => new { Status = group.Key, Count = group.Count() })
+                .ToDictionaryAsync(
+                    group => group.Status == FeedbackStatus.WontDo ? "WontDo" : group.Status.ToString(),
+                    group => group.Count,
+                    StringComparer.Ordinal,
+                    stoppingToken);
+
+            int pendingInviteCount = await dbContext.WorkspaceInvites
+                .CountAsync(invite => invite.Status == WorkspaceInviteStatuses.Pending, stoppingToken);
+
+            int staleInApprovalCount = await dbContext.ContentItems
+                .CountAsync(
+                    item => item.Status == "In approval" && item.CreatedAt <= staleApprovalCutoff,
+                    stoppingToken);
+
+            int activeWorkspaces24Hours = await dbContext.ContentItemActivityEntries
+                .Where(entry => entry.CreatedAt >= active24HourCutoff)
+                .Select(entry => entry.WorkspaceId)
+                .Distinct()
+                .CountAsync(stoppingToken);
+
+            int activeWorkspaces7Days = await dbContext.ContentItemActivityEntries
+                .Where(entry => entry.CreatedAt >= active7DayCutoff)
+                .Select(entry => entry.WorkspaceId)
+                .Distinct()
+                .CountAsync(stoppingToken);
+
+            metrics.UpdateWorkflowHealth(new WorkflowHealthSnapshot(
+                contentItemsByStatus,
+                feedbackReportsByStatus,
+                pendingInviteCount,
+                staleInApprovalCount,
+                activeWorkspaces24Hours,
+                activeWorkspaces7Days));
+            metrics.RecordBackgroundJobRun(nameof(WorkflowHealthSamplerService), true);
+        }
+        catch (OperationCanceledException ex) when (stoppingToken.IsCancellationRequested)
+        {
+            logger.LogDebug(ex, "Workflow health sampler stopped.");
+        }
+#pragma warning disable CA1031
+        catch (Exception ex)
+        {
+            metrics.RecordBackgroundJobRun(nameof(WorkflowHealthSamplerService), false);
+            logger.LogError(ex, "Workflow health sampling failed.");
+        }
+#pragma warning restore CA1031
+    }
+}

backend/src/Socialize.Api/Infrastructure/Payments/Stripe/Configuration/StripeOptions.cs

@@ -2,7 +2,7 @@ using System.ComponentModel.DataAnnotations;
 
 namespace Socialize.Api.Infrastructure.Payments.Stripe.Configuration;
 
-public class StripeOptions
+internal class StripeOptions
 {
     public const string ConfigurationSection = "Stripe";
 

backend/src/Socialize.Api/Infrastructure/Security/AccessScopeService.cs

@@ -4,54 +4,55 @@ using Socialize.Api.Modules.Organizations.Services;
 
 namespace Socialize.Api.Infrastructure.Security;
 
-public sealed class AccessScopeService(
+internal sealed class AccessScopeService(
     OrganizationAccessService organizationAccessService)
 {
-    public bool IsManager(ClaimsPrincipal user)
+    public static bool IsManager(ClaimsPrincipal user)
     {
         return user.IsInRole(KnownRoles.Administrator) || user.IsInRole(KnownRoles.Manager);
     }
 
-    public bool IsProvider(ClaimsPrincipal user)
+    public static bool IsProvider(ClaimsPrincipal user)
     {
         return user.IsInRole(KnownRoles.Provider);
     }
 
-    public bool IsClient(ClaimsPrincipal user)
+    public static bool IsClient(ClaimsPrincipal user)
     {
         return user.IsInRole(KnownRoles.Client);
     }
 
-    public bool CanAccessWorkspace(ClaimsPrincipal user, Guid workspaceId)
+    public static bool CanAccessWorkspace(ClaimsPrincipal user, Guid workspaceId)
     {
-        return IsManager(user) || user.GetWorkspaceScopeIds().Contains(workspaceId);
+        return user.GetWorkspaceScopeIds().Contains(workspaceId);
     }
 
-    public bool CanManageWorkspace(ClaimsPrincipal user, Guid workspaceId)
+    public static bool CanManageWorkspace(ClaimsPrincipal user, Guid workspaceId)
     {
         return IsManager(user) && CanAccessWorkspace(user, workspaceId);
     }
 
-    public bool CanAccessClient(ClaimsPrincipal user, Guid workspaceId, Guid clientId)
+    public static bool CanAccessClient(ClaimsPrincipal user, Guid workspaceId, Guid clientId)
     {
-        return IsManager(user)
+        return CanAccessWorkspace(user, workspaceId) &&
-               || (CanAccessWorkspace(user, workspaceId) && user.GetClientScopeIds().Contains(clientId));
+               (IsManager(user) || user.GetClientScopeIds().Contains(clientId));
     }
 
-    public bool CanAccessCampaign(ClaimsPrincipal user, Guid workspaceId, Guid clientId, Guid campaignId)
+    public static bool CanAccessCampaign(ClaimsPrincipal user, Guid workspaceId, Guid clientId, Guid campaignId)
     {
-        return IsManager(user)
+        return CanAccessClient(user, workspaceId, clientId) &&
-               || (CanAccessClient(user, workspaceId, clientId) && user.GetCampaignScopeIds().Contains(campaignId));
+               (IsManager(user) || user.GetCampaignScopeIds().Contains(campaignId));
     }
 
-    public bool CanContributeToCampaign(ClaimsPrincipal user, Guid workspaceId, Guid clientId, Guid campaignId)
+    public static bool CanContributeToCampaign(ClaimsPrincipal user, Guid workspaceId, Guid clientId, Guid campaignId)
     {
-        return IsManager(user) || (IsProvider(user) && CanAccessCampaign(user, workspaceId, clientId, campaignId));
+        return IsManager(user) && CanAccessCampaign(user, workspaceId, clientId, campaignId)
+               || IsProvider(user) && CanAccessCampaign(user, workspaceId, clientId, campaignId);
     }
 
-    public bool CanReviewContent(ClaimsPrincipal user, Guid workspaceId, Guid clientId, Guid campaignId)
+    public static bool CanReviewContent(ClaimsPrincipal user, Guid workspaceId, Guid clientId, Guid campaignId)
     {
-        return IsManager(user)
+        return IsManager(user) && CanAccessCampaign(user, workspaceId, clientId, campaignId)
                || IsProvider(user) && CanAccessCampaign(user, workspaceId, clientId, campaignId)
                || IsClient(user) && CanAccessClient(user, workspaceId, clientId);
     }
@@ -68,7 +69,7 @@ public sealed class AccessScopeService(
         Guid workspaceId,
         CancellationToken ct)
     {
-        return CanAccessWorkspace(user, workspaceId)
+        return user.GetWorkspaceScopeIds().Contains(workspaceId)
                || await organizationAccessService.HasInheritedWorkspacePermissionAsync(
                    user,
                    workspaceId,
@@ -81,7 +82,7 @@ public sealed class AccessScopeService(
         Guid workspaceId,
         CancellationToken ct)
     {
-        return IsManager(user)
+        return CanManageWorkspace(user, workspaceId)
                || await organizationAccessService.HasInheritedWorkspacePermissionAsync(
                    user,
                    workspaceId,
@@ -94,8 +95,7 @@ public sealed class AccessScopeService(
         Guid organizationId,
         CancellationToken ct)
     {
-        return IsManager(user)
+        return await organizationAccessService.HasOrganizationPermissionAsync(
-               || await organizationAccessService.HasOrganizationPermissionAsync(
                    user,
                    organizationId,
                    OrganizationPermissions.CreateWorkspaces,
@@ -108,8 +108,7 @@ public sealed class AccessScopeService(
         Guid clientId,
         CancellationToken ct)
     {
-        if (IsManager(user) ||
+        if (await organizationAccessService.HasInheritedWorkspacePermissionAsync(
-            await organizationAccessService.HasInheritedWorkspacePermissionAsync(
                 user,
                 workspaceId,
                 OrganizationPermissions.AccessOwnedWorkspaces,
@@ -128,8 +127,7 @@ public sealed class AccessScopeService(
         Guid campaignId,
         CancellationToken ct)
     {
-        if (IsManager(user) ||
+        if (await organizationAccessService.HasInheritedWorkspacePermissionAsync(
-            await organizationAccessService.HasInheritedWorkspacePermissionAsync(
                 user,
                 workspaceId,
                 OrganizationPermissions.AccessOwnedWorkspaces,
@@ -149,7 +147,7 @@ public sealed class AccessScopeService(
         Guid campaignId,
         CancellationToken ct)
     {
-        return IsManager(user)
+        return IsManager(user) && await CanAccessCampaignAsync(user, workspaceId, clientId, campaignId, ct)
                || await organizationAccessService.HasInheritedWorkspacePermissionAsync(
                    user,
                    workspaceId,
@@ -165,7 +163,7 @@ public sealed class AccessScopeService(
         Guid campaignId,
         CancellationToken ct)
     {
-        return IsManager(user)
+        return IsManager(user) && await CanAccessCampaignAsync(user, workspaceId, clientId, campaignId, ct)
                || await organizationAccessService.HasInheritedWorkspacePermissionAsync(
                    user,
                    workspaceId,

backend/src/Socialize.Api/Infrastructure/Security/ClaimsPrincipalExtensions.cs

@@ -1,8 +1,9 @@
-using System.Security.Claims;
+using System.Globalization;
+using System.Security.Claims;
 
 namespace Socialize.Api.Infrastructure.Security;
 
-public static class ClaimsPrincipalExtensions
+internal static class ClaimsPrincipalExtensions
 {
     public static IReadOnlyCollection<Guid> GetScopeIds(this ClaimsPrincipal claims, string key)
     {
@@ -81,11 +82,11 @@ public static class ClaimsPrincipalExtensions
 
         if (claim is null)
         {
-            throw new MissingClaimException(key);
+            throw MissingClaimException.ForClaim(key);
         }
 
         return typeof(TValue) == typeof(Guid)
             ? Guid.Parse(claim.Value)
-            : Convert.ChangeType(claim.Value, typeof(TValue));
+            : Convert.ChangeType(claim.Value, typeof(TValue), CultureInfo.InvariantCulture);
     }
 }

backend/src/Socialize.Api/Infrastructure/Security/GenerateJwtToken.cs

@@ -5,7 +5,7 @@ using Microsoft.IdentityModel.Tokens;
 
 namespace Socialize.Api.Infrastructure.Security;
 
-public static class JwtTokenHelper
+internal static class JwtTokenHelper
 {
     public static string GenerateJwtToken(
         TimeSpan expiresIn,

backend/src/Socialize.Api/Infrastructure/Security/KnownClaims.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Infrastructure.Security;
 
-public static class KnownClaims
+internal static class KnownClaims
 {
     public const string Alias = "alias";
     public const string PortraitUrl = "portraitUrl";

backend/src/Socialize.Api/Infrastructure/Security/MissingClaimException.cs

@@ -1,5 +1,23 @@
 namespace Socialize.Api.Infrastructure.Security;
 
-public class MissingClaimException(
+public class MissingClaimException : Exception
-    string claimName)
+{
-    : Exception($"Claim '{claimName}' is missing.");
+    public MissingClaimException()
+    {
+    }
+
+    public MissingClaimException(string message)
+        : base(message)
+    {
+    }
+
+    public MissingClaimException(string message, Exception innerException)
+        : base(message, innerException)
+    {
+    }
+
+    internal static MissingClaimException ForClaim(string claimName)
+    {
+        return new MissingClaimException($"Claim '{claimName}' is missing.");
+    }
+}

backend/src/Socialize.Api/Infrastructure/Security/PasswordGenerator.cs

@@ -4,15 +4,13 @@ using System.Text;
 namespace Socialize.Api.Infrastructure.Security;
 
 // If we need to add special characters we can alternate between 2 pools.
-public static class PasswordGenerator
+internal static class PasswordGenerator
 {
     private const string LowerLetters = "abcdefghijklmnopqrstuvwxyz";
     private const string UpperLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     private const string Numbers = "0123456789";
     private const string SpecialCharacters = "!@#$%^&*()_+-=[];',./`~{}|:\"<>?";
 
-    private static readonly Random Random = new();
-
     public static string Next(
         int length = 15,
         bool requireNumber = true,
@@ -23,7 +21,7 @@ public static class PasswordGenerator
         // Create pools based on the requirements
         StringBuilder characterPool = new();
 
-        if (requireNumber)
+        if (requireLowercase)
         {
             characterPool.Append(LowerLetters);
         }
@@ -51,22 +49,22 @@ public static class PasswordGenerator
 
         if (requireLowercase)
         {
-            password[index++] = LowerLetters[Random.Next(LowerLetters.Length)];
+            password[index++] = LowerLetters[RandomNumberGenerator.GetInt32(LowerLetters.Length)];
         }
 
         if (requireCapital)
         {
-            password[index++] = UpperLetters[Random.Next(UpperLetters.Length)];
+            password[index++] = UpperLetters[RandomNumberGenerator.GetInt32(UpperLetters.Length)];
         }
 
         if (requireNumber)
         {
-            password[index++] = Numbers[Random.Next(Numbers.Length)];
+            password[index++] = Numbers[RandomNumberGenerator.GetInt32(Numbers.Length)];
         }
 
         if (requireSpecialCharacter)
         {
-            password[index++] = SpecialCharacters[Random.Next(SpecialCharacters.Length)];
+            password[index++] = SpecialCharacters[RandomNumberGenerator.GetInt32(SpecialCharacters.Length)];
         }
 
         // Fill the rest with the password
@@ -85,7 +83,7 @@ public static class PasswordGenerator
     {
         for (int i = array.Length - 1; i > 0; i--)
         {
-            int j = Random.Next(i + 1);
+            int j = RandomNumberGenerator.GetInt32(i + 1);
             (array[i], array[j]) = (array[j], array[i]); // Swap elements
         }
     }

backend/src/Socialize.Api/Infrastructure/Security/RefreshTokenGenerator.cs

@@ -2,7 +2,7 @@ using System.Security.Cryptography;
 
 namespace Socialize.Api.Infrastructure.Security;
 
-public static class RefreshTokenGenerator
+internal static class RefreshTokenGenerator
 {
     public static string Next()
     {

backend/src/Socialize.Api/Infrastructure/TestData/TestDataSeedExtensions.cs

@@ -16,11 +16,12 @@ using Socialize.Api.Modules.Organizations.Data;
 using Socialize.Api.Modules.Organizations.Services;
 using Socialize.Api.Modules.Workspaces.Data;
 using Microsoft.AspNetCore.Identity;
-using Microsoft.Extensions.Options;
 
-namespace Socialize.Api.Infrastructure.Development;
+namespace Socialize.Api.Infrastructure.TestData;
 
-public static class DevelopmentSeedExtensions
+#pragma warning disable S1075 // Test data intentionally uses representative external URLs.
+
+internal static class TestDataSeedExtensions
 {
     private static readonly Guid OrganizationId = Guid.Parse("99999999-9999-9999-9999-999999999999");
     private static readonly Guid WorkspaceId = Guid.Parse("11111111-1111-1111-1111-111111111111");
@@ -39,23 +40,11 @@ public static class DevelopmentSeedExtensions
     private static readonly Guid ClientCommentId = Guid.Parse("77777777-7777-7777-7777-777777777777");
     private static readonly Guid NotificationId = Guid.Parse("88888888-8888-8888-8888-888888888888");
 
-    public static async Task<IApplicationBuilder> UseDevelopmentSeedAsync(
+    public static async Task<IServiceProvider> SeedTestDataAsync(
-        this IApplicationBuilder app,
+        this IServiceProvider services,
         CancellationToken cancellationToken = default)
     {
-        IHostEnvironment environment = app.ApplicationServices.GetRequiredService<IHostEnvironment>();
+        using IServiceScope scope = services.CreateScope();
-        if (!environment.IsDevelopment())
-        {
-            return app;
-        }
-
-        using IServiceScope scope = app.ApplicationServices.CreateScope();
-        IOptions<DevelopmentSeedOptions> options = scope.ServiceProvider.GetRequiredService<IOptions<DevelopmentSeedOptions>>();
-        if (!options.Value.Enabled)
-        {
-            return app;
-        }
-
         UserManager userManager = scope.ServiceProvider.GetRequiredService<UserManager>();
         AppDbContext dbContext = scope.ServiceProvider.GetRequiredService<AppDbContext>();
 
@@ -64,7 +53,7 @@ public static class DevelopmentSeedExtensions
             id: Guid.Parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"),
             username: "manager",
             email: "manager@socialize.local",
-            password: "manager",
+            password: "Manager1!",
             alias: "Northstar Manager",
             firstname: "Morgan",
             lastname: "Reid",
@@ -80,7 +69,7 @@ public static class DevelopmentSeedExtensions
             id: Guid.Parse("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb"),
             username: "client",
             email: "client@socialize.local",
-            password: "client",
+            password: "Client1!",
             alias: "Sofia Martin",
             firstname: "Sofia",
             lastname: "Martin",
@@ -97,7 +86,7 @@ public static class DevelopmentSeedExtensions
             id: Guid.Parse("cccccccc-cccc-cccc-cccc-cccccccccccc"),
             username: "provider",
             email: "provider@socialize.local",
-            password: "provider",
+            password: "Provider1!",
             alias: "Alex Studio",
             firstname: "Alex",
             lastname: "Studio",
@@ -115,7 +104,7 @@ public static class DevelopmentSeedExtensions
             id: Guid.Parse("dddddddd-dddd-dddd-dddd-dddddddddddd"),
             username: "dev",
             email: "dev@socialize.local",
-            password: "dev",
+            password: "Developer1!",
             alias: "Socialize Dev",
             firstname: "Jo",
             lastname: "Bumble",
@@ -138,7 +127,7 @@ public static class DevelopmentSeedExtensions
             dbContext,
             cancellationToken);
 
-        return app;
+        return services;
     }
 
     private static async Task<User> EnsureUserAsync(
@@ -175,7 +164,7 @@ public static class DevelopmentSeedExtensions
             if (!createResult.Succeeded)
             {
                 throw new InvalidOperationException(
-                    $"Failed to seed development user '{username}': {string.Join(", ", createResult.Errors.Select(error => error.Description))}");
+                    $"Failed to seed test user '{username}': {string.Join(", ", createResult.Errors.Select(error => error.Description))}");
             }
         }
 
@@ -195,7 +184,7 @@ public static class DevelopmentSeedExtensions
             if (!passwordResetResult.Succeeded)
             {
                 throw new InvalidOperationException(
-                    $"Failed to set development password for '{username}': {string.Join(", ", passwordResetResult.Errors.Select(error => error.Description))}");
+                    $"Failed to set test password for '{username}': {string.Join(", ", passwordResetResult.Errors.Select(error => error.Description))}");
             }
         }
 
@@ -222,13 +211,7 @@ public static class DevelopmentSeedExtensions
             await userManager.RemoveClaimAsync(user, claim);
         }
 
-        string persona = roles.Contains(KnownRoles.Manager, StringComparer.Ordinal)
+        string persona = GetPersona(roles);
-            ? KnownRoles.Manager
-            : roles.Contains(KnownRoles.Client, StringComparer.Ordinal)
-                ? KnownRoles.Client
-                : roles.Contains(KnownRoles.Provider, StringComparer.Ordinal)
-                    ? KnownRoles.Provider
-                    : KnownRoles.WorkspaceMember;
 
         foreach (Claim claim in claims.Concat([new Claim(KnownClaims.Persona, persona)]))
         {
@@ -238,6 +221,26 @@ public static class DevelopmentSeedExtensions
         return user;
     }
 
+    private static string GetPersona(IReadOnlyCollection<string> roles)
+    {
+        if (roles.Contains(KnownRoles.Manager, StringComparer.Ordinal))
+        {
+            return KnownRoles.Manager;
+        }
+
+        if (roles.Contains(KnownRoles.Client, StringComparer.Ordinal))
+        {
+            return KnownRoles.Client;
+        }
+
+        if (roles.Contains(KnownRoles.Provider, StringComparer.Ordinal))
+        {
+            return KnownRoles.Provider;
+        }
+
+        return KnownRoles.WorkspaceMember;
+    }
+
     private static async Task EnsureOrganizationDataAsync(
         Guid managerUserId,
         Guid developerUserId,
@@ -258,6 +261,7 @@ public static class DevelopmentSeedExtensions
         }
 
         organization.Name = "Northstar Agency";
+        organization.MembershipTierId = OrganizationMembershipTierSeed.AgencyId;
         organization.OwnerUserId = managerUserId;
 
         await UpsertOrganizationMembershipAsync(
@@ -487,8 +491,6 @@ public static class DevelopmentSeedExtensions
         comment.AuthorDisplayName = "Sofia Martin";
         comment.AuthorEmail = "client@socialize.local";
         comment.Body = "Please tighten the opening three seconds and make the launch CTA more explicit.";
-        comment.IsResolved = false;
-        comment.ResolvedAt = null;
         await dbContext.SaveChangesAsync(cancellationToken);
 
         ApprovalRequest? approvalRequest = await dbContext.ApprovalRequests.SingleOrDefaultAsync(candidate => candidate.Id == ScopedApprovalRequestId, cancellationToken);

backend/src/Socialize.Api/Infrastructure/YouTube/YouTubeUrlHelper.cs

@@ -2,7 +2,7 @@ using System.Text.RegularExpressions;
 
 namespace Socialize.Api.Infrastructure.YouTube;
 
-public static class YouTubeUrlHelper
+internal static class YouTubeUrlHelper
 {
     private static readonly Regex VideoIdRegex = new(
         @"(?:youtube\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^""&?/\s]{11})",

backend/src/Socialize.Api/Migrations/20260505162446_AddChannels.cs

@@ -1,50 +0,0 @@
-using System;
-using Microsoft.EntityFrameworkCore.Migrations;
-
-#nullable disable
-
-namespace Socialize.Api.Migrations
-{
-    /// <inheritdoc />
-    public partial class AddChannels : Migration
-    {
-        /// <inheritdoc />
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.CreateTable(
-                name: "Channels",
-                columns: table => new
-                {
-                    Id = table.Column<Guid>(type: "uuid", nullable: false),
-                    WorkspaceId = table.Column<Guid>(type: "uuid", nullable: false),
-                    Name = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: false),
-                    Network = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: false),
-                    Handle = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
-                    ExternalUrl = table.Column<string>(type: "character varying(2048)", maxLength: 2048, nullable: true),
-                    CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP")
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_Channels", x => x.Id);
-                });
-
-            migrationBuilder.CreateIndex(
-                name: "IX_Channels_WorkspaceId",
-                table: "Channels",
-                column: "WorkspaceId");
-
-            migrationBuilder.CreateIndex(
-                name: "IX_Channels_WorkspaceId_Network_Name",
-                table: "Channels",
-                columns: new[] { "WorkspaceId", "Network", "Name" },
-                unique: true);
-        }
-
-        /// <inheritdoc />
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.DropTable(
-                name: "Channels");
-        }
-    }
-}

backend/src/Socialize.Api/Migrations/20260507143849_Initial.Designer.cs

@@ -12,8 +12,8 @@ using Socialize.Api.Data;
 namespace Socialize.Api.Migrations
 {
     [DbContext(typeof(AppDbContext))]
-    [Migration("20260505162446_AddChannels")]
+    [Migration("20260507143849_Initial")]
-    partial class AddChannels
+    partial class Initial
     {
         /// <inheritdoc />
         protected override void BuildTargetModel(ModelBuilder modelBuilder)
@@ -441,6 +441,326 @@ namespace Socialize.Api.Migrations
                     b.ToTable("AssetRevisions", (string)null);
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarCatalogEntry", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Category")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("Country")
+                        .HasMaxLength(2)
+                        .HasColumnType("character varying(2)");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<string>("CultureOrReligion")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("DefaultColor")
+                        .IsRequired()
+                        .HasMaxLength(16)
+                        .HasColumnType("character varying(16)");
+
+                    b.Property<string>("Description")
+                        .IsRequired()
+                        .HasMaxLength(1024)
+                        .HasColumnType("character varying(1024)");
+
+                    b.Property<string>("Language")
+                        .IsRequired()
+                        .HasMaxLength(16)
+                        .HasColumnType("character varying(16)");
+
+                    b.Property<string>("ProviderName")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("Region")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("SourceUrl")
+                        .IsRequired()
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("TrustLevel")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Category");
+
+                    b.HasIndex("Country");
+
+                    b.HasIndex("ProviderName");
+
+                    b.ToTable("CalendarCatalogEntries", (string)null);
+
+                    b.HasData(
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Category = "public-holiday",
+                            Country = "US",
+                            CreatedAt = new DateTimeOffset(new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified), new TimeSpan(0, 0, 0, 0, 0)),
+                            DefaultColor = "#2F80ED",
+                            Description = "Federal public holiday calendar for the United States.",
+                            Language = "en",
+                            ProviderName = "Nager.Date",
+                            SourceUrl = "https://date.nager.at/api/v3/PublicHolidays/2026/US",
+                            Title = "United States Public Holidays",
+                            TrustLevel = "Verified"
+                        },
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000002"),
+                            Category = "public-holiday",
+                            Country = "CA",
+                            CreatedAt = new DateTimeOffset(new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified), new TimeSpan(0, 0, 0, 0, 0)),
+                            DefaultColor = "#2F80ED",
+                            Description = "Public holiday calendar for Canada.",
+                            Language = "en",
+                            ProviderName = "Nager.Date",
+                            SourceUrl = "https://date.nager.at/api/v3/PublicHolidays/2026/CA",
+                            Title = "Canada Public Holidays",
+                            TrustLevel = "Verified"
+                        },
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000003"),
+                            Category = "marketing-moment",
+                            CreatedAt = new DateTimeOffset(new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified), new TimeSpan(0, 0, 0, 0, 0)),
+                            DefaultColor = "#9B51E0",
+                            Description = "Common retail, awareness, and social planning moments.",
+                            Language = "en",
+                            ProviderName = "Socialize",
+                            SourceUrl = "https://example.com/socialize/marketing-moments.ics",
+                            Title = "Common Marketing Moments",
+                            TrustLevel = "Maintained"
+                        });
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarEvent", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("CalendarSourceId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(4000)
+                        .HasColumnType("character varying(4000)");
+
+                    b.Property<DateOnly>("EndDate")
+                        .HasColumnType("date");
+
+                    b.Property<DateTime?>("EndLocalDateTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTimeOffset?>("EndUtc")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTimeOffset>("ImportedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<bool>("IsAllDay")
+                        .HasColumnType("boolean");
+
+                    b.Property<bool>("IsFloatingTime")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Location")
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.Property<string>("RecurrenceId")
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.Property<string>("SourceEventUid")
+                        .IsRequired()
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.Property<DateTimeOffset?>("SourceLastModifiedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("SourceUrl")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<DateOnly>("StartDate")
+                        .HasColumnType("date");
+
+                    b.Property<DateTime?>("StartLocalDateTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTimeOffset?>("StartUtc")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("TimeZoneId")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CalendarSourceId");
+
+                    b.HasIndex("CalendarSourceId", "SourceEventUid", "StartDate")
+                        .IsUnique();
+
+                    b.ToTable("CalendarEvents", (string)null);
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarSource", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("CatalogSourceReference")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("Category")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("Color")
+                        .IsRequired()
+                        .HasMaxLength(16)
+                        .HasColumnType("character varying(16)");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<string>("DisplayTitle")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("InheritanceMode")
+                        .HasMaxLength(32)
+                        .HasColumnType("character varying(32)");
+
+                    b.Property<bool>("IsEnabled")
+                        .HasColumnType("boolean");
+
+                    b.Property<DateTimeOffset?>("LastAttemptedSyncAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTimeOffset?>("LastSuccessfulSyncAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("LastSyncError")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<Guid?>("OrganizationId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Scope")
+                        .IsRequired()
+                        .HasMaxLength(32)
+                        .HasColumnType("character varying(32)");
+
+                    b.Property<string>("SourceUrl")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<Guid?>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("WorkspaceId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("OrganizationId");
+
+                    b.HasIndex("Scope");
+
+                    b.HasIndex("UserId");
+
+                    b.HasIndex("WorkspaceId");
+
+                    b.ToTable("CalendarSources", (string)null);
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.UserCalendarExportFeed", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<DateTimeOffset?>("RevokedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Token")
+                        .HasMaxLength(96)
+                        .HasColumnType("character varying(96)");
+
+                    b.Property<string>("TokenHash")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TokenHash")
+                        .IsUnique();
+
+                    b.HasIndex("UserId")
+                        .IsUnique();
+
+                    b.ToTable("UserCalendarExportFeeds", (string)null);
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.Campaigns.Data.Campaign", b =>
                 {
                     b.Property<Guid>("Id")
@@ -592,6 +912,29 @@ namespace Socialize.Api.Migrations
                         .ValueGeneratedOnAdd()
                         .HasColumnType("uuid");
 
+                    b.Property<string>("AttachmentBlobContainerName")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("AttachmentBlobName")
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.Property<string>("AttachmentBlobUrl")
+                        .HasMaxLength(1024)
+                        .HasColumnType("character varying(1024)");
+
+                    b.Property<string>("AttachmentContentType")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("AttachmentFileName")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<long?>("AttachmentSizeBytes")
+                        .HasColumnType("bigint");
+
                     b.Property<string>("AuthorDisplayName")
                         .IsRequired()
                         .HasMaxLength(256)
@@ -618,15 +961,9 @@ namespace Socialize.Api.Migrations
                         .HasColumnType("timestamp with time zone")
                         .HasDefaultValueSql("CURRENT_TIMESTAMP");
 
-                    b.Property<bool>("IsResolved")
-                        .HasColumnType("boolean");
-
                     b.Property<Guid?>("ParentCommentId")
                         .HasColumnType("uuid");
 
-                    b.Property<DateTimeOffset?>("ResolvedAt")
-                        .HasColumnType("timestamp with time zone");
-
                     b.Property<Guid>("WorkspaceId")
                         .HasColumnType("uuid");
 
@@ -707,6 +1044,62 @@ namespace Socialize.Api.Migrations
                     b.ToTable("ContentItems", (string)null);
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.ContentItems.Data.ContentItemActivityEntry", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("ActorEmail")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<Guid?>("ActorUserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("ContentItemId")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<Guid>("EntityId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("EntityType")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("EventType")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("MetadataJson")
+                        .HasColumnType("jsonb");
+
+                    b.Property<string>("Summary")
+                        .IsRequired()
+                        .HasMaxLength(1024)
+                        .HasColumnType("character varying(1024)");
+
+                    b.Property<Guid>("WorkspaceId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ContentItemId");
+
+                    b.HasIndex("WorkspaceId");
+
+                    b.HasIndex("ContentItemId", "CreatedAt");
+
+                    b.ToTable("ContentItemActivityEntries", (string)null);
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.ContentItems.Data.ContentItemRevision", b =>
                 {
                     b.Property<Guid>("Id")
@@ -1259,6 +1652,10 @@ namespace Socialize.Api.Migrations
                         .HasColumnType("timestamp with time zone")
                         .HasDefaultValueSql("CURRENT_TIMESTAMP");
 
+                    b.Property<string>("LogoUrl")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
                     b.Property<string>("Name")
                         .IsRequired()
                         .HasMaxLength(256)
@@ -1462,6 +1859,15 @@ namespace Socialize.Api.Migrations
                         .IsRequired();
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarEvent", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarSource", null)
+                        .WithMany()
+                        .HasForeignKey("CalendarSourceId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.Feedback.Data.FeedbackActivityEntry", b =>
                 {
                     b.HasOne("Socialize.Api.Modules.Feedback.Data.FeedbackReport", "FeedbackReport")

backend/src/Socialize.Api/Migrations/20260507143849_Initial.cs

@@ -4,10 +4,13 @@ using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 
 #nullable disable
 
+#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
+#pragma warning disable CA1861 // Generated migration seed arrays are not runtime hot paths.
+
 namespace Socialize.Api.Migrations
 {
     /// <inheritdoc />
-    public partial class Initial : Migration
+    internal partial class Initial : Migration
     {
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)
@@ -162,6 +165,56 @@ namespace Socialize.Api.Migrations
                     table.PrimaryKey("PK_Assets", x => x.Id);
                 });
 
+            migrationBuilder.CreateTable(
+                name: "CalendarCatalogEntries",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Title = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: false),
+                    Description = table.Column<string>(type: "character varying(1024)", maxLength: 1024, nullable: false),
+                    Country = table.Column<string>(type: "character varying(2)", maxLength: 2, nullable: true),
+                    Region = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: true),
+                    Language = table.Column<string>(type: "character varying(16)", maxLength: 16, nullable: false),
+                    Category = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: false),
+                    CultureOrReligion = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: true),
+                    ProviderName = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: false),
+                    SourceUrl = table.Column<string>(type: "character varying(2048)", maxLength: 2048, nullable: false),
+                    TrustLevel = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: false),
+                    DefaultColor = table.Column<string>(type: "character varying(16)", maxLength: 16, nullable: false),
+                    CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_CalendarCatalogEntries", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "CalendarSources",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Scope = table.Column<string>(type: "character varying(32)", maxLength: 32, nullable: false),
+                    OrganizationId = table.Column<Guid>(type: "uuid", nullable: true),
+                    WorkspaceId = table.Column<Guid>(type: "uuid", nullable: true),
+                    UserId = table.Column<Guid>(type: "uuid", nullable: true),
+                    SourceUrl = table.Column<string>(type: "character varying(2048)", maxLength: 2048, nullable: true),
+                    CatalogSourceReference = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    DisplayTitle = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: false),
+                    Color = table.Column<string>(type: "character varying(16)", maxLength: 16, nullable: false),
+                    Category = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: false),
+                    IsEnabled = table.Column<bool>(type: "boolean", nullable: false),
+                    InheritanceMode = table.Column<string>(type: "character varying(32)", maxLength: 32, nullable: true),
+                    LastSuccessfulSyncAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    LastAttemptedSyncAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    LastSyncError = table.Column<string>(type: "character varying(2048)", maxLength: 2048, nullable: true),
+                    CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP"),
+                    UpdatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_CalendarSources", x => x.Id);
+                });
+
             migrationBuilder.CreateTable(
                 name: "Campaigns",
                 columns: table => new
@@ -182,6 +235,23 @@ namespace Socialize.Api.Migrations
                     table.PrimaryKey("PK_Campaigns", x => x.Id);
                 });
 
+            migrationBuilder.CreateTable(
+                name: "Channels",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    WorkspaceId = table.Column<Guid>(type: "uuid", nullable: false),
+                    Name = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: false),
+                    Network = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: false),
+                    Handle = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    ExternalUrl = table.Column<string>(type: "character varying(2048)", maxLength: 2048, nullable: true),
+                    CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Channels", x => x.Id);
+                });
+
             migrationBuilder.CreateTable(
                 name: "Clients",
                 columns: table => new
@@ -213,15 +283,40 @@ namespace Socialize.Api.Migrations
                     AuthorDisplayName = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: false),
                     AuthorEmail = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: false),
                     Body = table.Column<string>(type: "character varying(4000)", maxLength: 4000, nullable: false),
-                    IsResolved = table.Column<bool>(type: "boolean", nullable: false),
+                    AttachmentFileName = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
-                    CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP"),
+                    AttachmentContentType = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: true),
-                    ResolvedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true)
+                    AttachmentSizeBytes = table.Column<long>(type: "bigint", nullable: true),
+                    AttachmentBlobContainerName = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: true),
+                    AttachmentBlobName = table.Column<string>(type: "character varying(512)", maxLength: 512, nullable: true),
+                    AttachmentBlobUrl = table.Column<string>(type: "character varying(1024)", maxLength: 1024, nullable: true),
+                    CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP")
                 },
                 constraints: table =>
                 {
                     table.PrimaryKey("PK_Comments", x => x.Id);
                 });
 
+            migrationBuilder.CreateTable(
+                name: "ContentItemActivityEntries",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    WorkspaceId = table.Column<Guid>(type: "uuid", nullable: false),
+                    ContentItemId = table.Column<Guid>(type: "uuid", nullable: false),
+                    EventType = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: false),
+                    EntityType = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: false),
+                    EntityId = table.Column<Guid>(type: "uuid", nullable: false),
+                    Summary = table.Column<string>(type: "character varying(1024)", maxLength: 1024, nullable: false),
+                    ActorUserId = table.Column<Guid>(type: "uuid", nullable: true),
+                    ActorEmail = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    MetadataJson = table.Column<string>(type: "jsonb", nullable: true),
+                    CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ContentItemActivityEntries", x => x.Id);
+                });
+
             migrationBuilder.CreateTable(
                 name: "ContentItemRevisions",
                 columns: table => new
@@ -329,6 +424,7 @@ namespace Socialize.Api.Migrations
                 {
                     Id = table.Column<Guid>(type: "uuid", nullable: false),
                     Name = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: false),
+                    LogoUrl = table.Column<string>(type: "character varying(2048)", maxLength: 2048, nullable: true),
                     OwnerUserId = table.Column<Guid>(type: "uuid", nullable: false),
                     CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP")
                 },
@@ -337,6 +433,23 @@ namespace Socialize.Api.Migrations
                     table.PrimaryKey("PK_Organizations", x => x.Id);
                 });
 
+            migrationBuilder.CreateTable(
+                name: "UserCalendarExportFeeds",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    UserId = table.Column<Guid>(type: "uuid", nullable: false),
+                    Token = table.Column<string>(type: "character varying(96)", maxLength: 96, nullable: true),
+                    TokenHash = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: true),
+                    CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP"),
+                    UpdatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP"),
+                    RevokedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_UserCalendarExportFeeds", x => x.Id);
+                });
+
             migrationBuilder.CreateTable(
                 name: "WorkspaceApprovalStepConfigurations",
                 columns: table => new
@@ -478,6 +591,41 @@ namespace Socialize.Api.Migrations
                         onDelete: ReferentialAction.Cascade);
                 });
 
+            migrationBuilder.CreateTable(
+                name: "CalendarEvents",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    CalendarSourceId = table.Column<Guid>(type: "uuid", nullable: false),
+                    SourceEventUid = table.Column<string>(type: "character varying(512)", maxLength: 512, nullable: false),
+                    Title = table.Column<string>(type: "character varying(512)", maxLength: 512, nullable: false),
+                    Description = table.Column<string>(type: "character varying(4000)", maxLength: 4000, nullable: true),
+                    IsAllDay = table.Column<bool>(type: "boolean", nullable: false),
+                    IsFloatingTime = table.Column<bool>(type: "boolean", nullable: false),
+                    StartDate = table.Column<DateOnly>(type: "date", nullable: false),
+                    EndDate = table.Column<DateOnly>(type: "date", nullable: false),
+                    StartLocalDateTime = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
+                    EndLocalDateTime = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
+                    StartUtc = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    EndUtc = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    TimeZoneId = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: true),
+                    RecurrenceId = table.Column<string>(type: "character varying(512)", maxLength: 512, nullable: true),
+                    Location = table.Column<string>(type: "character varying(512)", maxLength: 512, nullable: true),
+                    SourceUrl = table.Column<string>(type: "character varying(2048)", maxLength: 2048, nullable: true),
+                    SourceLastModifiedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    ImportedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_CalendarEvents", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_CalendarEvents_CalendarSources_CalendarSourceId",
+                        column: x => x.CalendarSourceId,
+                        principalTable: "CalendarSources",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
             migrationBuilder.CreateTable(
                 name: "FeedbackActivityEntries",
                 columns: table => new
@@ -620,6 +768,16 @@ namespace Socialize.Api.Migrations
                         onDelete: ReferentialAction.Restrict);
                 });
 
+            migrationBuilder.InsertData(
+                table: "CalendarCatalogEntries",
+                columns: new[] { "Id", "Category", "Country", "CultureOrReligion", "DefaultColor", "Description", "Language", "ProviderName", "Region", "SourceUrl", "Title", "TrustLevel" },
+                values: new object[,]
+                {
+                    { new Guid("10000000-0000-0000-0000-000000000001"), "public-holiday", "US", null, "#2F80ED", "Federal public holiday calendar for the United States.", "en", "Nager.Date", null, "https://date.nager.at/api/v3/PublicHolidays/2026/US", "United States Public Holidays", "Verified" },
+                    { new Guid("10000000-0000-0000-0000-000000000002"), "public-holiday", "CA", null, "#2F80ED", "Public holiday calendar for Canada.", "en", "Nager.Date", null, "https://date.nager.at/api/v3/PublicHolidays/2026/CA", "Canada Public Holidays", "Verified" },
+                    { new Guid("10000000-0000-0000-0000-000000000003"), "marketing-moment", null, null, "#9B51E0", "Common retail, awareness, and social planning moments.", "en", "Socialize", null, "https://example.com/socialize/marketing-moments.ics", "Common Marketing Moments", "Maintained" }
+                });
+
             migrationBuilder.CreateIndex(
                 name: "IX_ApprovalDecisions_ApprovalRequestId",
                 table: "ApprovalDecisions",
@@ -720,6 +878,52 @@ namespace Socialize.Api.Migrations
                 table: "Assets",
                 column: "WorkspaceId");
 
+            migrationBuilder.CreateIndex(
+                name: "IX_CalendarCatalogEntries_Category",
+                table: "CalendarCatalogEntries",
+                column: "Category");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CalendarCatalogEntries_Country",
+                table: "CalendarCatalogEntries",
+                column: "Country");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CalendarCatalogEntries_ProviderName",
+                table: "CalendarCatalogEntries",
+                column: "ProviderName");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CalendarEvents_CalendarSourceId",
+                table: "CalendarEvents",
+                column: "CalendarSourceId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CalendarEvents_CalendarSourceId_SourceEventUid_StartDate",
+                table: "CalendarEvents",
+                columns: new[] { "CalendarSourceId", "SourceEventUid", "StartDate" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CalendarSources_OrganizationId",
+                table: "CalendarSources",
+                column: "OrganizationId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CalendarSources_Scope",
+                table: "CalendarSources",
+                column: "Scope");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CalendarSources_UserId",
+                table: "CalendarSources",
+                column: "UserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_CalendarSources_WorkspaceId",
+                table: "CalendarSources",
+                column: "WorkspaceId");
+
             migrationBuilder.CreateIndex(
                 name: "IX_Campaigns_ClientId",
                 table: "Campaigns",
@@ -736,6 +940,17 @@ namespace Socialize.Api.Migrations
                 table: "Campaigns",
                 column: "WorkspaceId");
 
+            migrationBuilder.CreateIndex(
+                name: "IX_Channels_WorkspaceId",
+                table: "Channels",
+                column: "WorkspaceId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Channels_WorkspaceId_Network_Name",
+                table: "Channels",
+                columns: new[] { "WorkspaceId", "Network", "Name" },
+                unique: true);
+
             migrationBuilder.CreateIndex(
                 name: "IX_Clients_WorkspaceId",
                 table: "Clients",
@@ -762,6 +977,21 @@ namespace Socialize.Api.Migrations
                 table: "Comments",
                 column: "WorkspaceId");
 
+            migrationBuilder.CreateIndex(
+                name: "IX_ContentItemActivityEntries_ContentItemId",
+                table: "ContentItemActivityEntries",
+                column: "ContentItemId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ContentItemActivityEntries_ContentItemId_CreatedAt",
+                table: "ContentItemActivityEntries",
+                columns: new[] { "ContentItemId", "CreatedAt" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ContentItemActivityEntries_WorkspaceId",
+                table: "ContentItemActivityEntries",
+                column: "WorkspaceId");
+
             migrationBuilder.CreateIndex(
                 name: "IX_ContentItemRevisions_ContentItemId",
                 table: "ContentItemRevisions",
@@ -901,6 +1131,18 @@ namespace Socialize.Api.Migrations
                 table: "Organizations",
                 column: "OwnerUserId");
 
+            migrationBuilder.CreateIndex(
+                name: "IX_UserCalendarExportFeeds_TokenHash",
+                table: "UserCalendarExportFeeds",
+                column: "TokenHash",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_UserCalendarExportFeeds_UserId",
+                table: "UserCalendarExportFeeds",
+                column: "UserId",
+                unique: true);
+
             migrationBuilder.CreateIndex(
                 name: "IX_WorkspaceApprovalStepConfigurations_WorkspaceId",
                 table: "WorkspaceApprovalStepConfigurations",
@@ -966,15 +1208,27 @@ namespace Socialize.Api.Migrations
             migrationBuilder.DropTable(
                 name: "Assets");
 
+            migrationBuilder.DropTable(
+                name: "CalendarCatalogEntries");
+
+            migrationBuilder.DropTable(
+                name: "CalendarEvents");
+
             migrationBuilder.DropTable(
                 name: "Campaigns");
 
+            migrationBuilder.DropTable(
+                name: "Channels");
+
             migrationBuilder.DropTable(
                 name: "Clients");
 
             migrationBuilder.DropTable(
                 name: "Comments");
 
+            migrationBuilder.DropTable(
+                name: "ContentItemActivityEntries");
+
             migrationBuilder.DropTable(
                 name: "ContentItemRevisions");
 
@@ -999,6 +1253,9 @@ namespace Socialize.Api.Migrations
             migrationBuilder.DropTable(
                 name: "OrganizationMemberships");
 
+            migrationBuilder.DropTable(
+                name: "UserCalendarExportFeeds");
+
             migrationBuilder.DropTable(
                 name: "WorkspaceApprovalStepConfigurations");
 
@@ -1014,6 +1271,9 @@ namespace Socialize.Api.Migrations
             migrationBuilder.DropTable(
                 name: "AspNetUsers");
 
+            migrationBuilder.DropTable(
+                name: "CalendarSources");
+
             migrationBuilder.DropTable(
                 name: "FeedbackReports");
 

backend/src/Socialize.Api/Migrations/20260507185052_AddMissingDomainForeignKeys.Designer.cs

@@ -12,8 +12,8 @@ using Socialize.Api.Data;
 namespace Socialize.Api.Migrations
 {
     [DbContext(typeof(AppDbContext))]
-    [Migration("20260505013232_Initial")]
+    [Migration("20260507185052_AddMissingDomainForeignKeys")]
-    partial class Initial
+    partial class AddMissingDomainForeignKeys
     {
         /// <inheritdoc />
         protected override void BuildTargetModel(ModelBuilder modelBuilder)
@@ -441,6 +441,326 @@ namespace Socialize.Api.Migrations
                     b.ToTable("AssetRevisions", (string)null);
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarCatalogEntry", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Category")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("Country")
+                        .HasMaxLength(2)
+                        .HasColumnType("character varying(2)");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<string>("CultureOrReligion")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("DefaultColor")
+                        .IsRequired()
+                        .HasMaxLength(16)
+                        .HasColumnType("character varying(16)");
+
+                    b.Property<string>("Description")
+                        .IsRequired()
+                        .HasMaxLength(1024)
+                        .HasColumnType("character varying(1024)");
+
+                    b.Property<string>("Language")
+                        .IsRequired()
+                        .HasMaxLength(16)
+                        .HasColumnType("character varying(16)");
+
+                    b.Property<string>("ProviderName")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("Region")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("SourceUrl")
+                        .IsRequired()
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("TrustLevel")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Category");
+
+                    b.HasIndex("Country");
+
+                    b.HasIndex("ProviderName");
+
+                    b.ToTable("CalendarCatalogEntries", (string)null);
+
+                    b.HasData(
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Category = "public-holiday",
+                            Country = "US",
+                            CreatedAt = new DateTimeOffset(new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified), new TimeSpan(0, 0, 0, 0, 0)),
+                            DefaultColor = "#2F80ED",
+                            Description = "Federal public holiday calendar for the United States.",
+                            Language = "en",
+                            ProviderName = "Nager.Date",
+                            SourceUrl = "https://date.nager.at/api/v3/PublicHolidays/2026/US",
+                            Title = "United States Public Holidays",
+                            TrustLevel = "Verified"
+                        },
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000002"),
+                            Category = "public-holiday",
+                            Country = "CA",
+                            CreatedAt = new DateTimeOffset(new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified), new TimeSpan(0, 0, 0, 0, 0)),
+                            DefaultColor = "#2F80ED",
+                            Description = "Public holiday calendar for Canada.",
+                            Language = "en",
+                            ProviderName = "Nager.Date",
+                            SourceUrl = "https://date.nager.at/api/v3/PublicHolidays/2026/CA",
+                            Title = "Canada Public Holidays",
+                            TrustLevel = "Verified"
+                        },
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000003"),
+                            Category = "marketing-moment",
+                            CreatedAt = new DateTimeOffset(new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified), new TimeSpan(0, 0, 0, 0, 0)),
+                            DefaultColor = "#9B51E0",
+                            Description = "Common retail, awareness, and social planning moments.",
+                            Language = "en",
+                            ProviderName = "Socialize",
+                            SourceUrl = "https://example.com/socialize/marketing-moments.ics",
+                            Title = "Common Marketing Moments",
+                            TrustLevel = "Maintained"
+                        });
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarEvent", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("CalendarSourceId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(4000)
+                        .HasColumnType("character varying(4000)");
+
+                    b.Property<DateOnly>("EndDate")
+                        .HasColumnType("date");
+
+                    b.Property<DateTime?>("EndLocalDateTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTimeOffset?>("EndUtc")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTimeOffset>("ImportedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<bool>("IsAllDay")
+                        .HasColumnType("boolean");
+
+                    b.Property<bool>("IsFloatingTime")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Location")
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.Property<string>("RecurrenceId")
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.Property<string>("SourceEventUid")
+                        .IsRequired()
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.Property<DateTimeOffset?>("SourceLastModifiedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("SourceUrl")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<DateOnly>("StartDate")
+                        .HasColumnType("date");
+
+                    b.Property<DateTime?>("StartLocalDateTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTimeOffset?>("StartUtc")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("TimeZoneId")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CalendarSourceId");
+
+                    b.HasIndex("CalendarSourceId", "SourceEventUid", "StartDate")
+                        .IsUnique();
+
+                    b.ToTable("CalendarEvents", (string)null);
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarSource", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("CatalogSourceReference")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("Category")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<string>("Color")
+                        .IsRequired()
+                        .HasMaxLength(16)
+                        .HasColumnType("character varying(16)");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<string>("DisplayTitle")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("InheritanceMode")
+                        .HasMaxLength(32)
+                        .HasColumnType("character varying(32)");
+
+                    b.Property<bool>("IsEnabled")
+                        .HasColumnType("boolean");
+
+                    b.Property<DateTimeOffset?>("LastAttemptedSyncAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTimeOffset?>("LastSuccessfulSyncAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("LastSyncError")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<Guid?>("OrganizationId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Scope")
+                        .IsRequired()
+                        .HasMaxLength(32)
+                        .HasColumnType("character varying(32)");
+
+                    b.Property<string>("SourceUrl")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<Guid?>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("WorkspaceId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("OrganizationId");
+
+                    b.HasIndex("Scope");
+
+                    b.HasIndex("UserId");
+
+                    b.HasIndex("WorkspaceId");
+
+                    b.ToTable("CalendarSources", (string)null);
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.UserCalendarExportFeed", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<DateTimeOffset?>("RevokedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Token")
+                        .HasMaxLength(96)
+                        .HasColumnType("character varying(96)");
+
+                    b.Property<string>("TokenHash")
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TokenHash")
+                        .IsUnique();
+
+                    b.HasIndex("UserId")
+                        .IsUnique();
+
+                    b.ToTable("UserCalendarExportFeeds", (string)null);
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.Campaigns.Data.Campaign", b =>
                 {
                     b.Property<Guid>("Id")
@@ -494,6 +814,48 @@ namespace Socialize.Api.Migrations
                     b.ToTable("Campaigns", (string)null);
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.Channels.Data.Channel", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<string>("ExternalUrl")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
+                    b.Property<string>("Handle")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("Network")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)");
+
+                    b.Property<Guid>("WorkspaceId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("WorkspaceId");
+
+                    b.HasIndex("WorkspaceId", "Network", "Name")
+                        .IsUnique();
+
+                    b.ToTable("Channels", (string)null);
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.Clients.Data.Client", b =>
                 {
                     b.Property<Guid>("Id")
@@ -550,6 +912,29 @@ namespace Socialize.Api.Migrations
                         .ValueGeneratedOnAdd()
                         .HasColumnType("uuid");
 
+                    b.Property<string>("AttachmentBlobContainerName")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("AttachmentBlobName")
+                        .HasMaxLength(512)
+                        .HasColumnType("character varying(512)");
+
+                    b.Property<string>("AttachmentBlobUrl")
+                        .HasMaxLength(1024)
+                        .HasColumnType("character varying(1024)");
+
+                    b.Property<string>("AttachmentContentType")
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("AttachmentFileName")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<long?>("AttachmentSizeBytes")
+                        .HasColumnType("bigint");
+
                     b.Property<string>("AuthorDisplayName")
                         .IsRequired()
                         .HasMaxLength(256)
@@ -576,15 +961,9 @@ namespace Socialize.Api.Migrations
                         .HasColumnType("timestamp with time zone")
                         .HasDefaultValueSql("CURRENT_TIMESTAMP");
 
-                    b.Property<bool>("IsResolved")
-                        .HasColumnType("boolean");
-
                     b.Property<Guid?>("ParentCommentId")
                         .HasColumnType("uuid");
 
-                    b.Property<DateTimeOffset?>("ResolvedAt")
-                        .HasColumnType("timestamp with time zone");
-
                     b.Property<Guid>("WorkspaceId")
                         .HasColumnType("uuid");
 
@@ -665,6 +1044,62 @@ namespace Socialize.Api.Migrations
                     b.ToTable("ContentItems", (string)null);
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.ContentItems.Data.ContentItemActivityEntry", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("ActorEmail")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<Guid?>("ActorUserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("ContentItemId")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+                    b.Property<Guid>("EntityId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("EntityType")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("EventType")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("character varying(128)");
+
+                    b.Property<string>("MetadataJson")
+                        .HasColumnType("jsonb");
+
+                    b.Property<string>("Summary")
+                        .IsRequired()
+                        .HasMaxLength(1024)
+                        .HasColumnType("character varying(1024)");
+
+                    b.Property<Guid>("WorkspaceId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ContentItemId");
+
+                    b.HasIndex("WorkspaceId");
+
+                    b.HasIndex("ContentItemId", "CreatedAt");
+
+                    b.ToTable("ContentItemActivityEntries", (string)null);
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.ContentItems.Data.ContentItemRevision", b =>
                 {
                     b.Property<Guid>("Id")
@@ -927,6 +1362,12 @@ namespace Socialize.Api.Migrations
 
                     b.HasKey("Id");
 
+                    b.HasIndex("CampaignId");
+
+                    b.HasIndex("ClientId");
+
+                    b.HasIndex("ContentItemId");
+
                     b.HasIndex("LastActivityAt");
 
                     b.HasIndex("ReporterUserId");
@@ -1217,6 +1658,10 @@ namespace Socialize.Api.Migrations
                         .HasColumnType("timestamp with time zone")
                         .HasDefaultValueSql("CURRENT_TIMESTAMP");
 
+                    b.Property<string>("LogoUrl")
+                        .HasMaxLength(2048)
+                        .HasColumnType("character varying(2048)");
+
                     b.Property<string>("Name")
                         .IsRequired()
                         .HasMaxLength(256)
@@ -1420,6 +1865,190 @@ namespace Socialize.Api.Migrations
                         .IsRequired();
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.Approvals.Data.ApprovalDecision", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.Approvals.Data.ApprovalRequest", null)
+                        .WithMany()
+                        .HasForeignKey("ApprovalRequestId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.Approvals.Data.ApprovalRequest", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.ContentItems.Data.ContentItem", null)
+                        .WithMany()
+                        .HasForeignKey("ContentItemId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("Socialize.Api.Modules.Approvals.Data.ApprovalWorkflowInstance", null)
+                        .WithMany()
+                        .HasForeignKey("WorkflowInstanceId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.Approvals.Data.ApprovalWorkflowInstance", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.ContentItems.Data.ContentItem", null)
+                        .WithMany()
+                        .HasForeignKey("ContentItemId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.Approvals.Data.WorkspaceApprovalStepConfiguration", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.Assets.Data.Asset", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.ContentItems.Data.ContentItem", null)
+                        .WithMany()
+                        .HasForeignKey("ContentItemId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.Assets.Data.AssetRevision", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.Assets.Data.Asset", null)
+                        .WithMany()
+                        .HasForeignKey("AssetId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarEvent", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.CalendarIntegrations.Data.CalendarSource", null)
+                        .WithMany()
+                        .HasForeignKey("CalendarSourceId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.Campaigns.Data.Campaign", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.Clients.Data.Client", null)
+                        .WithMany()
+                        .HasForeignKey("ClientId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.Channels.Data.Channel", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.Clients.Data.Client", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.Comments.Data.Comment", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.ContentItems.Data.ContentItem", null)
+                        .WithMany()
+                        .HasForeignKey("ContentItemId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("Socialize.Api.Modules.Comments.Data.Comment", null)
+                        .WithMany()
+                        .HasForeignKey("ParentCommentId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.ContentItems.Data.ContentItem", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.Campaigns.Data.Campaign", null)
+                        .WithMany()
+                        .HasForeignKey("CampaignId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("Socialize.Api.Modules.Clients.Data.Client", null)
+                        .WithMany()
+                        .HasForeignKey("ClientId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.ContentItems.Data.ContentItemActivityEntry", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.ContentItems.Data.ContentItem", null)
+                        .WithMany()
+                        .HasForeignKey("ContentItemId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Socialize.Api.Modules.ContentItems.Data.ContentItemRevision", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.ContentItems.Data.ContentItem", null)
+                        .WithMany()
+                        .HasForeignKey("ContentItemId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.Feedback.Data.FeedbackActivityEntry", b =>
                 {
                     b.HasOne("Socialize.Api.Modules.Feedback.Data.FeedbackReport", "FeedbackReport")
@@ -1442,6 +2071,29 @@ namespace Socialize.Api.Migrations
                     b.Navigation("FeedbackReport");
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.Feedback.Data.FeedbackReport", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.Campaigns.Data.Campaign", null)
+                        .WithMany()
+                        .HasForeignKey("CampaignId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("Socialize.Api.Modules.Clients.Data.Client", null)
+                        .WithMany()
+                        .HasForeignKey("ClientId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("Socialize.Api.Modules.ContentItems.Data.ContentItem", null)
+                        .WithMany()
+                        .HasForeignKey("ContentItemId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.SetNull);
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.Feedback.Data.FeedbackScreenshot", b =>
                 {
                     b.HasOne("Socialize.Api.Modules.Feedback.Data.FeedbackReport", "FeedbackReport")
@@ -1464,6 +2116,20 @@ namespace Socialize.Api.Migrations
                     b.Navigation("FeedbackReport");
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.Notifications.Data.NotificationEvent", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.ContentItems.Data.ContentItem", null)
+                        .WithMany()
+                        .HasForeignKey("ContentItemId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.Organizations.Data.OrganizationMembership", b =>
                 {
                     b.HasOne("Socialize.Api.Modules.Organizations.Data.Organization", null)
@@ -1482,6 +2148,15 @@ namespace Socialize.Api.Migrations
                         .IsRequired();
                 });
 
+            modelBuilder.Entity("Socialize.Api.Modules.Workspaces.Data.WorkspaceInvite", b =>
+                {
+                    b.HasOne("Socialize.Api.Modules.Workspaces.Data.Workspace", null)
+                        .WithMany()
+                        .HasForeignKey("WorkspaceId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+                });
+
             modelBuilder.Entity("Socialize.Api.Modules.Feedback.Data.FeedbackReport", b =>
                 {
                     b.Navigation("ActivityEntries");

backend/src/Socialize.Api/Migrations/20260507185052_AddMissingDomainForeignKeys.cs

@@ -0,0 +1,405 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Socialize.Api.Migrations
+{
+    /// <inheritdoc />
+    internal partial class AddMissingDomainForeignKeys : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateIndex(
+                name: "IX_FeedbackReports_CampaignId",
+                table: "FeedbackReports",
+                column: "CampaignId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_FeedbackReports_ClientId",
+                table: "FeedbackReports",
+                column: "ClientId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_FeedbackReports_ContentItemId",
+                table: "FeedbackReports",
+                column: "ContentItemId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ApprovalDecisions_ApprovalRequests_ApprovalRequestId",
+                table: "ApprovalDecisions",
+                column: "ApprovalRequestId",
+                principalTable: "ApprovalRequests",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ApprovalRequests_ApprovalWorkflowInstances_WorkflowInstance~",
+                table: "ApprovalRequests",
+                column: "WorkflowInstanceId",
+                principalTable: "ApprovalWorkflowInstances",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ApprovalRequests_ContentItems_ContentItemId",
+                table: "ApprovalRequests",
+                column: "ContentItemId",
+                principalTable: "ContentItems",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ApprovalRequests_Workspaces_WorkspaceId",
+                table: "ApprovalRequests",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ApprovalWorkflowInstances_ContentItems_ContentItemId",
+                table: "ApprovalWorkflowInstances",
+                column: "ContentItemId",
+                principalTable: "ContentItems",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ApprovalWorkflowInstances_Workspaces_WorkspaceId",
+                table: "ApprovalWorkflowInstances",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_AssetRevisions_Assets_AssetId",
+                table: "AssetRevisions",
+                column: "AssetId",
+                principalTable: "Assets",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Assets_ContentItems_ContentItemId",
+                table: "Assets",
+                column: "ContentItemId",
+                principalTable: "ContentItems",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Assets_Workspaces_WorkspaceId",
+                table: "Assets",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Campaigns_Clients_ClientId",
+                table: "Campaigns",
+                column: "ClientId",
+                principalTable: "Clients",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Campaigns_Workspaces_WorkspaceId",
+                table: "Campaigns",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Channels_Workspaces_WorkspaceId",
+                table: "Channels",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Clients_Workspaces_WorkspaceId",
+                table: "Clients",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Comments_Comments_ParentCommentId",
+                table: "Comments",
+                column: "ParentCommentId",
+                principalTable: "Comments",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Comments_ContentItems_ContentItemId",
+                table: "Comments",
+                column: "ContentItemId",
+                principalTable: "ContentItems",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Comments_Workspaces_WorkspaceId",
+                table: "Comments",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ContentItemActivityEntries_ContentItems_ContentItemId",
+                table: "ContentItemActivityEntries",
+                column: "ContentItemId",
+                principalTable: "ContentItems",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ContentItemActivityEntries_Workspaces_WorkspaceId",
+                table: "ContentItemActivityEntries",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ContentItemRevisions_ContentItems_ContentItemId",
+                table: "ContentItemRevisions",
+                column: "ContentItemId",
+                principalTable: "ContentItems",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ContentItems_Campaigns_CampaignId",
+                table: "ContentItems",
+                column: "CampaignId",
+                principalTable: "Campaigns",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ContentItems_Clients_ClientId",
+                table: "ContentItems",
+                column: "ClientId",
+                principalTable: "Clients",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ContentItems_Workspaces_WorkspaceId",
+                table: "ContentItems",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_FeedbackReports_Campaigns_CampaignId",
+                table: "FeedbackReports",
+                column: "CampaignId",
+                principalTable: "Campaigns",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.SetNull);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_FeedbackReports_Clients_ClientId",
+                table: "FeedbackReports",
+                column: "ClientId",
+                principalTable: "Clients",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.SetNull);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_FeedbackReports_ContentItems_ContentItemId",
+                table: "FeedbackReports",
+                column: "ContentItemId",
+                principalTable: "ContentItems",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.SetNull);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_FeedbackReports_Workspaces_WorkspaceId",
+                table: "FeedbackReports",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.SetNull);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_NotificationEvents_ContentItems_ContentItemId",
+                table: "NotificationEvents",
+                column: "ContentItemId",
+                principalTable: "ContentItems",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.SetNull);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_NotificationEvents_Workspaces_WorkspaceId",
+                table: "NotificationEvents",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_WorkspaceApprovalStepConfigurations_Workspaces_WorkspaceId",
+                table: "WorkspaceApprovalStepConfigurations",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_WorkspaceInvites_Workspaces_WorkspaceId",
+                table: "WorkspaceInvites",
+                column: "WorkspaceId",
+                principalTable: "Workspaces",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_ApprovalDecisions_ApprovalRequests_ApprovalRequestId",
+                table: "ApprovalDecisions");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ApprovalRequests_ApprovalWorkflowInstances_WorkflowInstance~",
+                table: "ApprovalRequests");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ApprovalRequests_ContentItems_ContentItemId",
+                table: "ApprovalRequests");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ApprovalRequests_Workspaces_WorkspaceId",
+                table: "ApprovalRequests");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ApprovalWorkflowInstances_ContentItems_ContentItemId",
+                table: "ApprovalWorkflowInstances");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ApprovalWorkflowInstances_Workspaces_WorkspaceId",
+                table: "ApprovalWorkflowInstances");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_AssetRevisions_Assets_AssetId",
+                table: "AssetRevisions");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Assets_ContentItems_ContentItemId",
+                table: "Assets");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Assets_Workspaces_WorkspaceId",
+                table: "Assets");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Campaigns_Clients_ClientId",
+                table: "Campaigns");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Campaigns_Workspaces_WorkspaceId",
+                table: "Campaigns");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Channels_Workspaces_WorkspaceId",
+                table: "Channels");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Clients_Workspaces_WorkspaceId",
+                table: "Clients");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Comments_Comments_ParentCommentId",
+                table: "Comments");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Comments_ContentItems_ContentItemId",
+                table: "Comments");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Comments_Workspaces_WorkspaceId",
+                table: "Comments");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ContentItemActivityEntries_ContentItems_ContentItemId",
+                table: "ContentItemActivityEntries");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ContentItemActivityEntries_Workspaces_WorkspaceId",
+                table: "ContentItemActivityEntries");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ContentItemRevisions_ContentItems_ContentItemId",
+                table: "ContentItemRevisions");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ContentItems_Campaigns_CampaignId",
+                table: "ContentItems");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ContentItems_Clients_ClientId",
+                table: "ContentItems");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_ContentItems_Workspaces_WorkspaceId",
+                table: "ContentItems");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_FeedbackReports_Campaigns_CampaignId",
+                table: "FeedbackReports");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_FeedbackReports_Clients_ClientId",
+                table: "FeedbackReports");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_FeedbackReports_ContentItems_ContentItemId",
+                table: "FeedbackReports");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_FeedbackReports_Workspaces_WorkspaceId",
+                table: "FeedbackReports");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_NotificationEvents_ContentItems_ContentItemId",
+                table: "NotificationEvents");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_NotificationEvents_Workspaces_WorkspaceId",
+                table: "NotificationEvents");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_WorkspaceApprovalStepConfigurations_Workspaces_WorkspaceId",
+                table: "WorkspaceApprovalStepConfigurations");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_WorkspaceInvites_Workspaces_WorkspaceId",
+                table: "WorkspaceInvites");
+
+            migrationBuilder.DropIndex(
+                name: "IX_FeedbackReports_CampaignId",
+                table: "FeedbackReports");
+
+            migrationBuilder.DropIndex(
+                name: "IX_FeedbackReports_ClientId",
+                table: "FeedbackReports");
+
+            migrationBuilder.DropIndex(
+                name: "IX_FeedbackReports_ContentItemId",
+                table: "FeedbackReports");
+        }
+    }
+}

backend/src/Socialize.Api/Migrations/20260508001846_AddOrganizationMembershipTiers.cs

@@ -0,0 +1,118 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
+
+namespace Socialize.Api.Migrations
+{
+    /// <inheritdoc />
+    internal partial class AddOrganizationMembershipTiers : Migration
+    {
+        private static readonly string[] MembershipTierSeedColumns =
+        [
+            "Id",
+            "ActiveContentLimit",
+            "Description",
+            "ExternalReviewerLimit",
+            "IsCustom",
+            "Key",
+            "MemberLimit",
+            "MonthlyPriceCents",
+            "Name",
+            "SortOrder",
+            "WorkspaceLimit"
+        ];
+
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "MembershipTierId",
+                table: "Organizations",
+                type: "uuid",
+                nullable: false,
+                defaultValue: new Guid("20000000-0000-0000-0000-000000000001"));
+
+            migrationBuilder.CreateTable(
+                name: "OrganizationMembershipTiers",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Key = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: false),
+                    Name = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: false),
+                    Description = table.Column<string>(type: "character varying(512)", maxLength: 512, nullable: false),
+                    MonthlyPriceCents = table.Column<int>(type: "integer", nullable: true),
+                    WorkspaceLimit = table.Column<int>(type: "integer", nullable: true),
+                    ActiveContentLimit = table.Column<int>(type: "integer", nullable: true),
+                    MemberLimit = table.Column<int>(type: "integer", nullable: true),
+                    ExternalReviewerLimit = table.Column<int>(type: "integer", nullable: true),
+                    IsCustom = table.Column<bool>(type: "boolean", nullable: false),
+                    SortOrder = table.Column<int>(type: "integer", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_OrganizationMembershipTiers", x => x.Id);
+                });
+
+            migrationBuilder.InsertData(
+                table: "OrganizationMembershipTiers",
+                columns: MembershipTierSeedColumns,
+                values: new object[,]
+                {
+                    { new Guid("20000000-0000-0000-0000-000000000001"), 3, "For trying Socialize on one real approval workflow.", 1, false, "free", 2, 0, "Free", 10, 1 },
+                    { new Guid("20000000-0000-0000-0000-000000000002"), 25, "For solo operators managing recurring client reviews.", 10, false, "freelance", 5, 1900, "Freelance", 20, 3 },
+                    { new Guid("20000000-0000-0000-0000-000000000003"), 250, "For agencies that need repeatable client approval operations.", null, false, "agency", 25, 7900, "Agency", 30, 15 },
+                    { new Guid("20000000-0000-0000-0000-000000000004"), null, "For larger organizations with governance and access needs.", null, true, "enterprise", null, null, "Enterprise", 40, null }
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Organizations_MembershipTierId",
+                table: "Organizations",
+                column: "MembershipTierId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_OrganizationMembershipTiers_Key",
+                table: "OrganizationMembershipTiers",
+                column: "Key",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_OrganizationMembershipTiers_SortOrder",
+                table: "OrganizationMembershipTiers",
+                column: "SortOrder");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Organizations_OrganizationMembershipTiers_MembershipTierId",
+                table: "Organizations",
+                column: "MembershipTierId",
+                principalTable: "OrganizationMembershipTiers",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Organizations_OrganizationMembershipTiers_MembershipTierId",
+                table: "Organizations");
+
+            migrationBuilder.DropTable(
+                name: "OrganizationMembershipTiers");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Organizations_MembershipTierId",
+                table: "Organizations");
+
+            migrationBuilder.DropColumn(
+                name: "MembershipTierId",
+                table: "Organizations");
+        }
+    }
+}

backend/src/Socialize.Api/Migrations/20260508003746_LocalizeOrganizationMembershipTiers.cs

@@ -0,0 +1,137 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
+
+namespace Socialize.Api.Migrations
+{
+    /// <inheritdoc />
+    internal partial class LocalizeOrganizationMembershipTiers : Migration
+    {
+        private static readonly string[] MembershipTierTranslationSeedColumns =
+        [
+            "Id",
+            "Culture",
+            "Description",
+            "MembershipTierId",
+            "Name"
+        ];
+
+        private static readonly string[] MembershipTierColumnsToRestore =
+        [
+            "Description",
+            "Name"
+        ];
+
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.DropColumn(
+                name: "Description",
+                table: "OrganizationMembershipTiers");
+
+            migrationBuilder.DropColumn(
+                name: "Name",
+                table: "OrganizationMembershipTiers");
+
+            migrationBuilder.CreateTable(
+                name: "OrganizationMembershipTierTranslations",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    MembershipTierId = table.Column<Guid>(type: "uuid", nullable: false),
+                    Culture = table.Column<string>(type: "character varying(16)", maxLength: 16, nullable: false),
+                    Name = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: false),
+                    Description = table.Column<string>(type: "character varying(512)", maxLength: 512, nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_OrganizationMembershipTierTranslations", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_OrganizationMembershipTierTranslations_OrganizationMembersh~",
+                        column: x => x.MembershipTierId,
+                        principalTable: "OrganizationMembershipTiers",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.InsertData(
+                table: "OrganizationMembershipTierTranslations",
+                columns: MembershipTierTranslationSeedColumns,
+                values: new object[,]
+                {
+                    { new Guid("20000000-0000-0001-0000-000000000001"), "en", "For trying Socialize on one real approval workflow.", new Guid("20000000-0000-0000-0000-000000000001"), "Free" },
+                    { new Guid("20000000-0000-0001-0000-000000000002"), "fr", "Pour essayer Socialize sur un vrai workflow d'approbation.", new Guid("20000000-0000-0000-0000-000000000001"), "Free" },
+                    { new Guid("20000000-0000-0001-0000-000000000003"), "en", "For solo operators managing recurring client reviews.", new Guid("20000000-0000-0000-0000-000000000002"), "Freelance" },
+                    { new Guid("20000000-0000-0001-0000-000000000004"), "fr", "Pour les independants qui gerent des revisions client recurrentes.", new Guid("20000000-0000-0000-0000-000000000002"), "Freelance" },
+                    { new Guid("20000000-0000-0001-0000-000000000005"), "en", "For agencies that need repeatable client approval operations.", new Guid("20000000-0000-0000-0000-000000000003"), "Agency" },
+                    { new Guid("20000000-0000-0001-0000-000000000006"), "fr", "Pour les agences qui veulent des operations d'approbation client repetables.", new Guid("20000000-0000-0000-0000-000000000003"), "Agency" },
+                    { new Guid("20000000-0000-0001-0000-000000000007"), "en", "For larger organizations with governance and access needs.", new Guid("20000000-0000-0000-0000-000000000004"), "Enterprise" },
+                    { new Guid("20000000-0000-0001-0000-000000000008"), "fr", "Pour les grandes organisations avec des besoins de gouvernance et d'acces.", new Guid("20000000-0000-0000-0000-000000000004"), "Enterprise" }
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_OrganizationMembershipTierTranslations_MembershipTierId_Cul~",
+                table: "OrganizationMembershipTierTranslations",
+                columns: ["MembershipTierId", "Culture"],
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.DropTable(
+                name: "OrganizationMembershipTierTranslations");
+
+            migrationBuilder.AddColumn<string>(
+                name: "Description",
+                table: "OrganizationMembershipTiers",
+                type: "character varying(512)",
+                maxLength: 512,
+                nullable: false,
+                defaultValue: "");
+
+            migrationBuilder.AddColumn<string>(
+                name: "Name",
+                table: "OrganizationMembershipTiers",
+                type: "character varying(128)",
+                maxLength: 128,
+                nullable: false,
+                defaultValue: "");
+
+            migrationBuilder.UpdateData(
+                table: "OrganizationMembershipTiers",
+                keyColumn: "Id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000001"),
+                columns: MembershipTierColumnsToRestore,
+                values: new object[] { "For trying Socialize on one real approval workflow.", "Free" });
+
+            migrationBuilder.UpdateData(
+                table: "OrganizationMembershipTiers",
+                keyColumn: "Id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000002"),
+                columns: MembershipTierColumnsToRestore,
+                values: new object[] { "For solo operators managing recurring client reviews.", "Freelance" });
+
+            migrationBuilder.UpdateData(
+                table: "OrganizationMembershipTiers",
+                keyColumn: "Id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000003"),
+                columns: MembershipTierColumnsToRestore,
+                values: new object[] { "For agencies that need repeatable client approval operations.", "Agency" });
+
+            migrationBuilder.UpdateData(
+                table: "OrganizationMembershipTiers",
+                keyColumn: "Id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000004"),
+                columns: MembershipTierColumnsToRestore,
+                values: new object[] { "For larger organizations with governance and access needs.", "Enterprise" });
+        }
+    }
+}

backend/src/Socialize.Api/Migrations/20260508010206_AddReleaseCommunications.cs

@@ -0,0 +1,197 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Socialize.Api.Migrations
+{
+    /// <inheritdoc />
+    internal partial class AddReleaseCommunications : Migration
+    {
+        private static readonly string[] ReleaseUpdateReadReceiptUniqueIndexColumns =
+        [
+            "ReleaseUpdateId",
+            "UserId",
+        ];
+
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<DateTimeOffset>(
+                name: "LastAuthenticatedAt",
+                table: "AspNetUsers",
+                type: "timestamp with time zone",
+                nullable: true);
+
+            migrationBuilder.CreateTable(
+                name: "ReleaseUpdateEmailDigestReceipts",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    UserId = table.Column<Guid>(type: "uuid", nullable: false),
+                    SentAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP"),
+                    UpdateCount = table.Column<int>(type: "integer", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ReleaseUpdateEmailDigestReceipts", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "ReleaseUpdates",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Title = table.Column<string>(type: "character varying(160)", maxLength: 160, nullable: false),
+                    Summary = table.Column<string>(type: "character varying(512)", maxLength: 512, nullable: false),
+                    Body = table.Column<string>(type: "character varying(8000)", maxLength: 8000, nullable: true),
+                    Category = table.Column<string>(type: "character varying(32)", maxLength: 32, nullable: false),
+                    Importance = table.Column<string>(type: "character varying(32)", maxLength: 32, nullable: false),
+                    Audience = table.Column<string>(type: "character varying(32)", maxLength: 32, nullable: false),
+                    Status = table.Column<string>(type: "character varying(32)", maxLength: 32, nullable: false),
+                    DeploymentLabel = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: true),
+                    BuildVersion = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: true),
+                    CommitRange = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    CreatedByUserId = table.Column<Guid>(type: "uuid", nullable: false),
+                    CreatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP"),
+                    UpdatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false),
+                    PublishedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    ArchivedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    ManualEmailSentByUserId = table.Column<Guid>(type: "uuid", nullable: true),
+                    ManualEmailSentAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    ManualEmailAudience = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: true),
+                    ManualEmailRecipientCount = table.Column<int>(type: "integer", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ReleaseUpdates", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "ReleaseCommits",
+                columns: table => new
+                {
+                    Sha = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: false),
+                    ShortSha = table.Column<string>(type: "character varying(16)", maxLength: 16, nullable: false),
+                    Subject = table.Column<string>(type: "character varying(512)", maxLength: 512, nullable: false),
+                    AuthorName = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    AuthorEmail = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    AuthoredAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    CommittedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    SourceBranch = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    DeploymentLabel = table.Column<string>(type: "character varying(128)", maxLength: 128, nullable: true),
+                    ExternalUrl = table.Column<string>(type: "character varying(2048)", maxLength: 2048, nullable: true),
+                    CommunicationStatus = table.Column<string>(type: "character varying(32)", maxLength: 32, nullable: false),
+                    ReleaseUpdateId = table.Column<Guid>(type: "uuid", nullable: true),
+                    ImportedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP"),
+                    UpdatedAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ReleaseCommits", x => x.Sha);
+                    table.ForeignKey(
+                        name: "FK_ReleaseCommits_ReleaseUpdates_ReleaseUpdateId",
+                        column: x => x.ReleaseUpdateId,
+                        principalTable: "ReleaseUpdates",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.SetNull);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "ReleaseUpdateReadReceipts",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    ReleaseUpdateId = table.Column<Guid>(type: "uuid", nullable: false),
+                    UserId = table.Column<Guid>(type: "uuid", nullable: false),
+                    ReadAt = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "CURRENT_TIMESTAMP")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ReleaseUpdateReadReceipts", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_ReleaseUpdateReadReceipts_ReleaseUpdates_ReleaseUpdateId",
+                        column: x => x.ReleaseUpdateId,
+                        principalTable: "ReleaseUpdates",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseCommits_CommittedAt",
+                table: "ReleaseCommits",
+                column: "CommittedAt");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseCommits_CommunicationStatus",
+                table: "ReleaseCommits",
+                column: "CommunicationStatus");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseCommits_ReleaseUpdateId",
+                table: "ReleaseCommits",
+                column: "ReleaseUpdateId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseUpdateEmailDigestReceipts_SentAt",
+                table: "ReleaseUpdateEmailDigestReceipts",
+                column: "SentAt");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseUpdateEmailDigestReceipts_UserId",
+                table: "ReleaseUpdateEmailDigestReceipts",
+                column: "UserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseUpdateReadReceipts_ReleaseUpdateId_UserId",
+                table: "ReleaseUpdateReadReceipts",
+                columns: ReleaseUpdateReadReceiptUniqueIndexColumns,
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseUpdateReadReceipts_UserId",
+                table: "ReleaseUpdateReadReceipts",
+                column: "UserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseUpdates_Audience",
+                table: "ReleaseUpdates",
+                column: "Audience");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseUpdates_CreatedByUserId",
+                table: "ReleaseUpdates",
+                column: "CreatedByUserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseUpdates_PublishedAt",
+                table: "ReleaseUpdates",
+                column: "PublishedAt");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseUpdates_Status",
+                table: "ReleaseUpdates",
+                column: "Status");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "ReleaseCommits");
+
+            migrationBuilder.DropTable(
+                name: "ReleaseUpdateEmailDigestReceipts");
+
+            migrationBuilder.DropTable(
+                name: "ReleaseUpdateReadReceipts");
+
+            migrationBuilder.DropTable(
+                name: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "LastAuthenticatedAt",
+                table: "AspNetUsers");
+        }
+    }
+}

backend/src/Socialize.Api/Migrations/20260508030349_SimplifyReleaseUpdates.cs

@@ -0,0 +1,118 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Socialize.Api.Migrations
+{
+    /// <inheritdoc />
+    internal partial class SimplifyReleaseUpdates : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_ReleaseUpdates_Audience",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "Audience",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "Body",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "BuildVersion",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "Category",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "CommitRange",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "DeploymentLabel",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "Importance",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "ManualEmailAudience",
+                table: "ReleaseUpdates");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "Audience",
+                table: "ReleaseUpdates",
+                type: "character varying(32)",
+                maxLength: 32,
+                nullable: false,
+                defaultValue: "");
+
+            migrationBuilder.AddColumn<string>(
+                name: "Body",
+                table: "ReleaseUpdates",
+                type: "character varying(8000)",
+                maxLength: 8000,
+                nullable: true);
+
+            migrationBuilder.AddColumn<string>(
+                name: "BuildVersion",
+                table: "ReleaseUpdates",
+                type: "character varying(128)",
+                maxLength: 128,
+                nullable: true);
+
+            migrationBuilder.AddColumn<string>(
+                name: "Category",
+                table: "ReleaseUpdates",
+                type: "character varying(32)",
+                maxLength: 32,
+                nullable: false,
+                defaultValue: "");
+
+            migrationBuilder.AddColumn<string>(
+                name: "CommitRange",
+                table: "ReleaseUpdates",
+                type: "character varying(256)",
+                maxLength: 256,
+                nullable: true);
+
+            migrationBuilder.AddColumn<string>(
+                name: "DeploymentLabel",
+                table: "ReleaseUpdates",
+                type: "character varying(128)",
+                maxLength: 128,
+                nullable: true);
+
+            migrationBuilder.AddColumn<string>(
+                name: "Importance",
+                table: "ReleaseUpdates",
+                type: "character varying(32)",
+                maxLength: 32,
+                nullable: false,
+                defaultValue: "");
+
+            migrationBuilder.AddColumn<string>(
+                name: "ManualEmailAudience",
+                table: "ReleaseUpdates",
+                type: "character varying(64)",
+                maxLength: 64,
+                nullable: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ReleaseUpdates_Audience",
+                table: "ReleaseUpdates",
+                column: "Audience");
+        }
+    }
+}

backend/src/Socialize.Api/Migrations/20260508031114_AddFrenchReleaseUpdateFields.cs

@@ -0,0 +1,49 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Socialize.Api.Migrations
+{
+    /// <inheritdoc />
+    internal partial class AddFrenchReleaseUpdateFields : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "SummaryFr",
+                table: "ReleaseUpdates",
+                type: "character varying(512)",
+                maxLength: 512,
+                nullable: false,
+                defaultValue: "");
+
+            migrationBuilder.AddColumn<string>(
+                name: "TitleFr",
+                table: "ReleaseUpdates",
+                type: "character varying(160)",
+                maxLength: 160,
+                nullable: false,
+                defaultValue: "");
+
+            migrationBuilder.Sql("""
+                UPDATE "ReleaseUpdates"
+                SET "TitleFr" = "Title",
+                    "SummaryFr" = "Summary"
+                WHERE "TitleFr" = '' AND "SummaryFr" = '';
+                """);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "SummaryFr",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "TitleFr",
+                table: "ReleaseUpdates");
+        }
+    }
+}

backend/src/Socialize.Api/Migrations/20260508034156_RemoveManualReleaseUpdateEmail.cs

@@ -0,0 +1,53 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Socialize.Api.Migrations
+{
+    /// <inheritdoc />
+    internal partial class RemoveManualReleaseUpdateEmail : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.DropColumn(
+                name: "ManualEmailRecipientCount",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "ManualEmailSentAt",
+                table: "ReleaseUpdates");
+
+            migrationBuilder.DropColumn(
+                name: "ManualEmailSentByUserId",
+                table: "ReleaseUpdates");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.AddColumn<int>(
+                name: "ManualEmailRecipientCount",
+                table: "ReleaseUpdates",
+                type: "integer",
+                nullable: true);
+
+            migrationBuilder.AddColumn<DateTimeOffset>(
+                name: "ManualEmailSentAt",
+                table: "ReleaseUpdates",
+                type: "timestamp with time zone",
+                nullable: true);
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "ManualEmailSentByUserId",
+                table: "ReleaseUpdates",
+                type: "uuid",
+                nullable: true);
+        }
+    }
+}

backend/src/Socialize.Api/Migrations/20260508034902_ExpandReleaseUpdateDescriptions.cs

@@ -0,0 +1,62 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Socialize.Api.Migrations
+{
+    /// <inheritdoc />
+    internal partial class ExpandReleaseUpdateDescriptions : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "SummaryFr",
+                table: "ReleaseUpdates",
+                type: "character varying(4000)",
+                maxLength: 4000,
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "character varying(512)",
+                oldMaxLength: 512);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "Summary",
+                table: "ReleaseUpdates",
+                type: "character varying(4000)",
+                maxLength: 4000,
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "character varying(512)",
+                oldMaxLength: 512);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "SummaryFr",
+                table: "ReleaseUpdates",
+                type: "character varying(512)",
+                maxLength: 512,
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "character varying(4000)",
+                oldMaxLength: 4000);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "Summary",
+                table: "ReleaseUpdates",
+                type: "character varying(512)",
+                maxLength: 512,
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "character varying(4000)",
+                oldMaxLength: 4000);
+        }
+    }
+}

backend/src/Socialize.Api/Migrations/20260508122220_AddUserPreferredLanguage.cs

@@ -0,0 +1,34 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Socialize.Api.Migrations
+{
+    /// <inheritdoc />
+    internal partial class AddUserPreferredLanguage : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.AddColumn<string>(
+                name: "PreferredLanguage",
+                table: "AspNetUsers",
+                type: "character varying(8)",
+                maxLength: 8,
+                nullable: false,
+                defaultValue: "en");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            ArgumentNullException.ThrowIfNull(migrationBuilder);
+
+            migrationBuilder.DropColumn(
+                name: "PreferredLanguage",
+                table: "AspNetUsers");
+        }
+    }
+}

backend/src/Socialize.Api/Modules/Approvals/Data/ApprovalDecision.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Modules.Approvals.Data;
 
-public class ApprovalDecision
+internal class ApprovalDecision
 {
     public Guid Id { get; init; }
     public Guid ApprovalRequestId { get; set; }

backend/src/Socialize.Api/Modules/Approvals/Data/ApprovalModelConfiguration.cs

@@ -1,8 +1,10 @@
 using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Modules.ContentItems.Data;
+using Socialize.Api.Modules.Workspaces.Data;
 
 namespace Socialize.Api.Modules.Approvals.Data;
 
-public static class ApprovalModelConfiguration
+internal static class ApprovalModelConfiguration
 {
     public static ModelBuilder ConfigureApprovalsModule(this ModelBuilder modelBuilder)
     {
@@ -20,6 +22,14 @@ public static class ApprovalModelConfiguration
             workflowInstance.HasIndex(x => new { x.ContentItemId, x.State })
                 .IsUnique()
                 .HasFilter("\"State\" = 'Pending'");
+            workflowInstance.HasOne<Workspace>()
+                .WithMany()
+                .HasForeignKey(x => x.WorkspaceId)
+                .OnDelete(DeleteBehavior.Restrict);
+            workflowInstance.HasOne<ContentItem>()
+                .WithMany()
+                .HasForeignKey(x => x.ContentItemId)
+                .OnDelete(DeleteBehavior.Restrict);
         });
 
         modelBuilder.Entity<ApprovalRequest>(approvalRequest =>
@@ -40,6 +50,18 @@ public static class ApprovalModelConfiguration
             approvalRequest.HasIndex(x => x.ContentItemId);
             approvalRequest.HasIndex(x => x.WorkflowInstanceId);
             approvalRequest.HasIndex(x => x.ReviewerEmail);
+            approvalRequest.HasOne<Workspace>()
+                .WithMany()
+                .HasForeignKey(x => x.WorkspaceId)
+                .OnDelete(DeleteBehavior.Restrict);
+            approvalRequest.HasOne<ContentItem>()
+                .WithMany()
+                .HasForeignKey(x => x.ContentItemId)
+                .OnDelete(DeleteBehavior.Restrict);
+            approvalRequest.HasOne<ApprovalWorkflowInstance>()
+                .WithMany()
+                .HasForeignKey(x => x.WorkflowInstanceId)
+                .OnDelete(DeleteBehavior.Restrict);
         });
 
         modelBuilder.Entity<ApprovalDecision>(approvalDecision =>
@@ -54,6 +76,10 @@ public static class ApprovalModelConfiguration
                 .ValueGeneratedOnAdd()
                 .HasDefaultValueSql("CURRENT_TIMESTAMP");
             approvalDecision.HasIndex(x => x.ApprovalRequestId);
+            approvalDecision.HasOne<ApprovalRequest>()
+                .WithMany()
+                .HasForeignKey(x => x.ApprovalRequestId)
+                .OnDelete(DeleteBehavior.Restrict);
         });
 
         modelBuilder.Entity<WorkspaceApprovalStepConfiguration>(approvalStep =>
@@ -69,6 +95,10 @@ public static class ApprovalModelConfiguration
                 .HasDefaultValueSql("CURRENT_TIMESTAMP");
             approvalStep.HasIndex(x => x.WorkspaceId);
             approvalStep.HasIndex(x => new { x.WorkspaceId, x.SortOrder }).IsUnique();
+            approvalStep.HasOne<Workspace>()
+                .WithMany()
+                .HasForeignKey(x => x.WorkspaceId)
+                .OnDelete(DeleteBehavior.Restrict);
         });
 
         return modelBuilder;

backend/src/Socialize.Api/Modules/Approvals/Data/ApprovalRequest.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Modules.Approvals.Data;
 
-public class ApprovalRequest
+internal class ApprovalRequest
 {
     public Guid Id { get; init; }
     public Guid WorkspaceId { get; set; }

backend/src/Socialize.Api/Modules/Approvals/Data/ApprovalWorkflowInstance.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Modules.Approvals.Data;
 
-public class ApprovalWorkflowInstance
+internal class ApprovalWorkflowInstance
 {
     public Guid Id { get; init; }
     public Guid WorkspaceId { get; set; }

backend/src/Socialize.Api/Modules/Approvals/Data/WorkspaceApprovalStepConfiguration.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Modules.Approvals.Data;
 
-public class WorkspaceApprovalStepConfiguration
+internal class WorkspaceApprovalStepConfiguration
 {
     public Guid Id { get; init; }
     public Guid WorkspaceId { get; set; }

backend/src/Socialize.Api/Modules/Approvals/Handlers/GetApprovals.cs

@@ -7,9 +7,9 @@ using Socialize.Api.Infrastructure.Security;
 
 namespace Socialize.Api.Modules.Approvals.Handlers;
 
-public record GetApprovalsRequest(Guid ContentItemId);
+internal record GetApprovalsRequest(Guid ContentItemId);
 
-public record ApprovalDecisionDto(
+internal record ApprovalDecisionDto(
     Guid Id,
     Guid ApprovalRequestId,
     string Decision,
@@ -20,7 +20,7 @@ public record ApprovalDecisionDto(
     string? DecidedByPortraitUrl,
     DateTimeOffset CreatedAt);
 
-public record ApprovalRequestDto(
+internal record ApprovalRequestDto(
     Guid Id,
     Guid WorkspaceId,
     Guid ContentItemId,
@@ -40,7 +40,7 @@ public record ApprovalRequestDto(
     DateTimeOffset? CompletedAt,
     IReadOnlyCollection<ApprovalDecisionDto> Decisions);
 
-public class GetApprovalsHandler(
+internal class GetApprovalsHandler(
     AppDbContext dbContext,
     AccessScopeService accessScopeService)
     : Endpoint<GetApprovalsRequest, IReadOnlyCollection<ApprovalRequestDto>>

backend/src/Socialize.Api/Modules/Approvals/Handlers/SubmitApprovalDecision.cs

@@ -1,21 +1,25 @@
 using FastEndpoints;
 using Microsoft.EntityFrameworkCore;
 using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Observability;
 using Socialize.Api.Infrastructure.Security;
 using Socialize.Api.Modules.ContentItems.Data;
+using Socialize.Api.Modules.ContentItems.Contracts;
 using Socialize.Api.Modules.Approvals.Data;
 using Socialize.Api.Modules.Approvals.Services;
 using Socialize.Api.Modules.Notifications.Contracts;
 using Socialize.Api.Modules.Workspaces.Data;
+using System.Security.Claims;
+using System.Text.Json;
 
 namespace Socialize.Api.Modules.Approvals.Handlers;
 
-public record SubmitApprovalDecisionRequest(
+internal record SubmitApprovalDecisionRequest(
     string Decision,
     string? ReviewerName,
     string? ReviewerEmail);
 
-public class SubmitApprovalDecisionRequestValidator
+internal class SubmitApprovalDecisionRequestValidator
     : Validator<SubmitApprovalDecisionRequest>
 {
     public SubmitApprovalDecisionRequestValidator()
@@ -29,11 +33,13 @@ public class SubmitApprovalDecisionRequestValidator
     }
 }
 
-public class SubmitApprovalDecisionHandler(
+internal class SubmitApprovalDecisionHandler(
     AppDbContext dbContext,
     AccessScopeService accessScopeService,
     ApprovalWorkflowRuntimeService approvalWorkflowRuntimeService,
-    INotificationEventWriter notificationEventWriter)
+    IContentItemActivityWriter activityWriter,
+    INotificationEventWriter notificationEventWriter,
+    SocializeMetrics metrics)
     : Endpoint<SubmitApprovalDecisionRequest, ApprovalRequestDto>
 {
     public override void Configure()
@@ -76,12 +82,14 @@ public class SubmitApprovalDecisionHandler(
         }
 
         string normalizedDecision = request.Decision.Trim();
-        string decidedByName = User?.Identity?.IsAuthenticated == true
+        ClaimsPrincipal? currentUser = User;
-            ? User.GetAlias() ?? User.GetName()
+        bool isAuthenticated = currentUser?.Identity?.IsAuthenticated == true;
-            : string.IsNullOrWhiteSpace(request.ReviewerName) ? approval.ReviewerName : request.ReviewerName.Trim();
+        string decidedByName = isAuthenticated
-        string decidedByEmail = User?.Identity?.IsAuthenticated == true
+            ? currentUser!.GetAlias() ?? currentUser!.GetName()
-            ? User.GetEmail()
+            : GetReviewerName(request.ReviewerName, approval.ReviewerName);
-            : string.IsNullOrWhiteSpace(request.ReviewerEmail) ? approval.ReviewerEmail : request.ReviewerEmail.Trim();
+        string decidedByEmail = isAuthenticated
+            ? currentUser!.GetEmail()
+            : GetReviewerEmail(request.ReviewerEmail, approval.ReviewerEmail);
 
         ApprovalDecision decision = new()
         {
@@ -120,6 +128,24 @@ public class SubmitApprovalDecisionHandler(
             dbContext.ApprovalDecisions.Add(decision);
             await dbContext.SaveChangesAsync(ct);
 
+            await activityWriter.WriteAsync(
+                new ContentItemActivityWriteModel(
+                    approval.WorkspaceId,
+                    approval.ContentItemId,
+                    "approval.decision.recorded",
+                    "ApprovalDecision",
+                    decision.Id,
+                    $"{decidedByName} recorded {normalizedDecision} for {contentItem.Title}.",
+                    decision.DecidedByUserId,
+                    decidedByEmail,
+                    JsonSerializer.Serialize(new
+                    {
+                        stage = approval.Stage,
+                        status = contentItem.Status,
+                        decision = normalizedDecision,
+                    })),
+                ct);
+
             await notificationEventWriter.WriteAsync(
                 new NotificationEventWriteModel(
                     approval.WorkspaceId,
@@ -133,6 +159,7 @@ public class SubmitApprovalDecisionHandler(
                     $$"""{"stage":"{{approval.Stage}}","status":"{{contentItem.Status}}"}"""),
                 ct);
         }
+        metrics.RecordApprovalDecisionSubmitted(approval.WorkspaceId, normalizedDecision);
 
         List<ApprovalDecision> decisions = await dbContext.ApprovalDecisions
             .Where(candidate => candidate.ApprovalRequestId == approval.Id)
@@ -186,4 +213,18 @@ public class SubmitApprovalDecisionHandler(
 
         await SendOkAsync(dto, ct);
     }
+
+    private static string GetReviewerName(string? requestedName, string fallbackName)
+    {
+        return string.IsNullOrWhiteSpace(requestedName)
+            ? fallbackName
+            : requestedName.Trim();
+    }
+
+    private static string GetReviewerEmail(string? requestedEmail, string fallbackEmail)
+    {
+        return string.IsNullOrWhiteSpace(requestedEmail)
+            ? fallbackEmail
+            : requestedEmail.Trim();
+    }
 }

backend/src/Socialize.Api/Modules/Approvals/ModuleRegistration.cs

@@ -2,7 +2,7 @@ using Socialize.Api.Modules.Approvals.Services;
 
 namespace Socialize.Api.Modules.Approvals;
 
-public static class DependencyInjection
+internal static class ModuleRegistration
 {
     public static WebApplicationBuilder AddApprovalsModule(
         this WebApplicationBuilder builder)

backend/src/Socialize.Api/Modules/Approvals/Services/ApprovalStepConfigurationRules.cs

@@ -2,20 +2,20 @@ using Socialize.Api.Modules.Identity.Contracts;
 
 namespace Socialize.Api.Modules.Approvals.Services;
 
-public static class ApprovalStepTargetTypes
+internal static class ApprovalStepTargetTypes
 {
     public const string Role = "Role";
     public const string Membership = "Membership";
     public const string Member = "Member";
 }
 
-public static class ApprovalMembershipTargets
+internal static class ApprovalMembershipTargets
 {
     public const string Team = "Team";
     public const string Client = "Client";
 }
 
-public static class ApprovalStepConfigurationRules
+internal static class ApprovalStepConfigurationRules
 {
     public static readonly IReadOnlySet<string> AllowedTargetTypes = new HashSet<string>(StringComparer.Ordinal)
     {

backend/src/Socialize.Api/Modules/Approvals/Services/ApprovalWorkflowRules.cs

@@ -2,7 +2,7 @@ using Socialize.Api.Modules.Identity.Contracts;
 
 namespace Socialize.Api.Modules.Approvals.Services;
 
-public static class ApprovalModes
+internal static class ApprovalModes
 {
     public const string None = "None";
     public const string Optional = "Optional";
@@ -10,7 +10,7 @@ public static class ApprovalModes
     public const string MultiLevel = "Multi-level";
 }
 
-public static class ApprovalWorkflowRules
+internal static class ApprovalWorkflowRules
 {
     public static bool BlocksManualApprovedOrScheduledStatus(string approvalMode)
     {

backend/src/Socialize.Api/Modules/Approvals/Services/ApprovalWorkflowRuntimeService.cs

@@ -11,15 +11,15 @@ using Socialize.Api.Modules.Workspaces.Data;
 
 namespace Socialize.Api.Modules.Approvals.Services;
 
-public record ApprovalWorkflowStartResult(bool Succeeded, string? ErrorMessage);
+internal record ApprovalWorkflowStartResult(bool Succeeded, string? ErrorMessage);
 
-public record ApprovalWorkflowDecisionResult(
+internal record ApprovalWorkflowDecisionResult(
     bool Succeeded,
     string? ErrorMessage,
     int StatusCode,
     bool IsWorkflowStep);
 
-public class ApprovalWorkflowRuntimeService(
+internal class ApprovalWorkflowRuntimeService(
     AppDbContext dbContext,
     INotificationEventWriter notificationEventWriter)
 {
@@ -145,13 +145,15 @@ public class ApprovalWorkflowRuntimeService(
         dbContext.ApprovalDecisions.Add(decision);
         await dbContext.SaveChangesAsync(ct);
 
-        int approvedCount = await dbContext.ApprovalDecisions
+        var approvalDecisionParticipants = await dbContext.ApprovalDecisions
             .Where(candidate => candidate.ApprovalRequestId == approval.Id && candidate.Decision == ApprovedState)
             .Select(candidate => candidate.DecidedByUserId.HasValue
                 ? candidate.DecidedByUserId.Value.ToString()
-                : candidate.DecidedByEmail.ToLower())
+                : candidate.DecidedByEmail)
-            .Distinct()
+            .ToListAsync(ct);
-            .CountAsync(ct);
+        int approvedCount = approvalDecisionParticipants
+            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .Count();
 
         int requiredApproverCount = approval.WorkflowStepRequiredApproverCount ?? 1;
         if (!ApprovalWorkflowRules.HasRequiredStepApprovals(approvedCount, requiredApproverCount))
@@ -394,7 +396,7 @@ public class ApprovalWorkflowRuntimeService(
 
     private static string CreateAccessToken()
     {
-        return Convert.ToHexString(RandomNumberGenerator.GetBytes(16)).ToLowerInvariant();
+        return Convert.ToHexString(RandomNumberGenerator.GetBytes(16));
     }
 
     private sealed record ApprovalNotificationRecipient(Guid UserId, string? Email);

backend/src/Socialize.Api/Modules/Assets/Data/Asset.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Modules.Assets.Data;
 
-public class Asset
+internal class Asset
 {
     public Guid Id { get; init; }
     public Guid WorkspaceId { get; set; }

backend/src/Socialize.Api/Modules/Assets/Data/AssetModelConfiguration.cs

@@ -1,8 +1,10 @@
 using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Modules.ContentItems.Data;
+using Socialize.Api.Modules.Workspaces.Data;
 
 namespace Socialize.Api.Modules.Assets.Data;
 
-public static class AssetModelConfiguration
+internal static class AssetModelConfiguration
 {
     public static ModelBuilder ConfigureAssetsModule(this ModelBuilder modelBuilder)
     {
@@ -21,6 +23,14 @@ public static class AssetModelConfiguration
                 .HasDefaultValueSql("CURRENT_TIMESTAMP");
             asset.HasIndex(x => x.WorkspaceId);
             asset.HasIndex(x => x.ContentItemId);
+            asset.HasOne<Workspace>()
+                .WithMany()
+                .HasForeignKey(x => x.WorkspaceId)
+                .OnDelete(DeleteBehavior.Restrict);
+            asset.HasOne<ContentItem>()
+                .WithMany()
+                .HasForeignKey(x => x.ContentItemId)
+                .OnDelete(DeleteBehavior.Restrict);
         });
 
         modelBuilder.Entity<AssetRevision>(revision =>
@@ -35,6 +45,10 @@ public static class AssetModelConfiguration
                 .HasDefaultValueSql("CURRENT_TIMESTAMP");
             revision.HasIndex(x => x.AssetId);
             revision.HasIndex(x => new { x.AssetId, x.RevisionNumber }).IsUnique();
+            revision.HasOne<Asset>()
+                .WithMany()
+                .HasForeignKey(x => x.AssetId)
+                .OnDelete(DeleteBehavior.Cascade);
         });
 
         return modelBuilder;

backend/src/Socialize.Api/Modules/Assets/Data/AssetRevision.cs

@@ -1,6 +1,6 @@
 namespace Socialize.Api.Modules.Assets.Data;
 
-public class AssetRevision
+internal class AssetRevision
 {
     public Guid Id { get; init; }
     public Guid AssetId { get; set; }

backend/src/Socialize.Api/Modules/Assets/Handlers/CreateAssetRevision.cs

@@ -3,17 +3,19 @@ using Microsoft.EntityFrameworkCore;
 using Socialize.Api.Data;
 using Socialize.Api.Infrastructure.Security;
 using Socialize.Api.Modules.Assets.Data;
+using Socialize.Api.Modules.ContentItems.Contracts;
 using Socialize.Api.Modules.ContentItems.Data;
 using Socialize.Api.Modules.Notifications.Contracts;
+using System.Text.Json;
 
 namespace Socialize.Api.Modules.Assets.Handlers;
 
-public record CreateAssetRevisionRequest(
+internal record CreateAssetRevisionRequest(
     string SourceReference,
     string? PreviewUrl,
     string? Notes);
 
-public class CreateAssetRevisionRequestValidator
+internal class CreateAssetRevisionRequestValidator
     : Validator<CreateAssetRevisionRequest>
 {
     public CreateAssetRevisionRequestValidator()
@@ -24,9 +26,10 @@ public class CreateAssetRevisionRequestValidator
     }
 }
 
-public class CreateAssetRevisionHandler(
+internal class CreateAssetRevisionHandler(
     AppDbContext dbContext,
     AccessScopeService accessScopeService,
+    IContentItemActivityWriter activityWriter,
     INotificationEventWriter notificationEventWriter)
     : Endpoint<CreateAssetRevisionRequest, AssetRevisionDto>
 {
@@ -78,6 +81,25 @@ public class CreateAssetRevisionHandler(
 
         if (contentItem is not null)
         {
+            await activityWriter.WriteAsync(
+                new ContentItemActivityWriteModel(
+                    asset.WorkspaceId,
+                    asset.ContentItemId,
+                    "asset.revision.created",
+                    "AssetRevision",
+                    revision.Id,
+                    $"A new asset revision was added to {asset.DisplayName}.",
+                    User.GetUserId(),
+                    User.GetEmail(),
+                    JsonSerializer.Serialize(new
+                    {
+                        assetId = asset.Id,
+                        revisionNumber,
+                        sourceReference = revision.SourceReference,
+                        notes = revision.Notes,
+                    })),
+                ct);
+
             await notificationEventWriter.WriteAsync(
                 new NotificationEventWriteModel(
                     asset.WorkspaceId,

backend/src/Socialize.Api/Modules/Assets/Handlers/CreateGoogleDriveAsset.cs

@@ -3,12 +3,14 @@ using Microsoft.EntityFrameworkCore;
 using Socialize.Api.Data;
 using Socialize.Api.Infrastructure.Security;
 using Socialize.Api.Modules.Assets.Data;
+using Socialize.Api.Modules.ContentItems.Contracts;
 using Socialize.Api.Modules.ContentItems.Data;
 using Socialize.Api.Modules.Notifications.Contracts;
+using System.Text.Json;
 
 namespace Socialize.Api.Modules.Assets.Handlers;
 
-public record CreateGoogleDriveAssetRequest(
+internal record CreateGoogleDriveAssetRequest(
     Guid WorkspaceId,
     Guid ContentItemId,
     string AssetType,
@@ -17,7 +19,7 @@ public record CreateGoogleDriveAssetRequest(
     string GoogleDriveLink,
     string? PreviewUrl);
 
-public class CreateGoogleDriveAssetRequestValidator
+internal class CreateGoogleDriveAssetRequestValidator
     : Validator<CreateGoogleDriveAssetRequest>
 {
     public CreateGoogleDriveAssetRequestValidator()
@@ -32,9 +34,10 @@ public class CreateGoogleDriveAssetRequestValidator
     }
 }
 
-public class CreateGoogleDriveAssetHandler(
+internal class CreateGoogleDriveAssetHandler(
     AppDbContext dbContext,
     AccessScopeService accessScopeService,
+    IContentItemActivityWriter activityWriter,
     INotificationEventWriter notificationEventWriter)
     : Endpoint<CreateGoogleDriveAssetRequest, AssetDto>
 {
@@ -93,6 +96,25 @@ public class CreateGoogleDriveAssetHandler(
         dbContext.AssetRevisions.Add(revision);
         await dbContext.SaveChangesAsync(ct);
 
+        await activityWriter.WriteAsync(
+            new ContentItemActivityWriteModel(
+                asset.WorkspaceId,
+                asset.ContentItemId,
+                "asset.google-drive-linked",
+                "Asset",
+                asset.Id,
+                $"Google Drive asset {asset.DisplayName} was linked to {contentItem.Title}.",
+                User.GetUserId(),
+                User.GetEmail(),
+                JsonSerializer.Serialize(new
+                {
+                    assetType = asset.AssetType,
+                    sourceType = asset.SourceType,
+                    googleDriveFileId = asset.GoogleDriveFileId,
+                    currentRevisionNumber = asset.CurrentRevisionNumber,
+                })),
+            ct);
+
         await notificationEventWriter.WriteAsync(
             new NotificationEventWriteModel(
                 asset.WorkspaceId,

backend/src/Socialize.Api/Modules/Assets/Handlers/GetAssets.cs

@@ -5,9 +5,9 @@ using Socialize.Api.Infrastructure.Security;
 
 namespace Socialize.Api.Modules.Assets.Handlers;
 
-public record GetAssetsRequest(Guid ContentItemId);
+internal record GetAssetsRequest(Guid ContentItemId);
 
-public record AssetRevisionDto(
+internal record AssetRevisionDto(
     Guid Id,
     Guid AssetId,
     int RevisionNumber,
@@ -17,7 +17,7 @@ public record AssetRevisionDto(
     Guid? CreatedByUserId,
     DateTimeOffset CreatedAt);
 
-public record AssetDto(
+internal record AssetDto(
     Guid Id,
     Guid WorkspaceId,
     Guid ContentItemId,
@@ -31,7 +31,7 @@ public record AssetDto(
     DateTimeOffset CreatedAt,
     IReadOnlyCollection<AssetRevisionDto> Revisions);
 
-public class GetAssetsHandler(
+internal class GetAssetsHandler(
     AppDbContext dbContext,
     AccessScopeService accessScopeService)
     : Endpoint<GetAssetsRequest, IReadOnlyCollection<AssetDto>>

backend/src/Socialize.Api/Modules/Assets/ModuleRegistration.cs

@@ -2,7 +2,7 @@ using Socialize.Api.Modules.Assets.Data;
 
 namespace Socialize.Api.Modules.Assets;
 
-public static class DependencyInjection
+internal static class ModuleRegistration
 {
     public static WebApplicationBuilder AddAssetsModule(
         this WebApplicationBuilder builder)

backend/src/Socialize.Api/Modules/CalendarIntegrations/Data/CalendarCatalogEntry.cs

@@ -0,0 +1,18 @@
+namespace Socialize.Api.Modules.CalendarIntegrations.Data;
+
+internal class CalendarCatalogEntry
+{
+    public Guid Id { get; init; }
+    public required string Title { get; set; }
+    public required string Description { get; set; }
+    public string? Country { get; set; }
+    public string? Region { get; set; }
+    public required string Language { get; set; }
+    public required string Category { get; set; }
+    public string? CultureOrReligion { get; set; }
+    public required string ProviderName { get; set; }
+    public required string SourceUrl { get; set; }
+    public required string TrustLevel { get; set; }
+    public required string DefaultColor { get; set; }
+    public DateTimeOffset CreatedAt { get; init; }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Data/CalendarCatalogSeed.cs

@@ -0,0 +1,55 @@
+namespace Socialize.Api.Modules.CalendarIntegrations.Data;
+
+#pragma warning disable S1075 // Catalog seed entries intentionally store source URLs.
+
+internal static class CalendarCatalogSeed
+{
+    public static readonly CalendarCatalogEntry[] Entries =
+    [
+        new()
+        {
+            Id = Guid.Parse("10000000-0000-0000-0000-000000000001"),
+            Title = "United States Public Holidays",
+            Description = "Federal public holiday calendar for the United States.",
+            Country = "US",
+            Region = null,
+            Language = "en",
+            Category = "public-holiday",
+            CultureOrReligion = null,
+            ProviderName = "Nager.Date",
+            SourceUrl = "https://date.nager.at/api/v3/PublicHolidays/2026/US",
+            TrustLevel = "Verified",
+            DefaultColor = "#2F80ED",
+        },
+        new()
+        {
+            Id = Guid.Parse("10000000-0000-0000-0000-000000000002"),
+            Title = "Canada Public Holidays",
+            Description = "Public holiday calendar for Canada.",
+            Country = "CA",
+            Region = null,
+            Language = "en",
+            Category = "public-holiday",
+            CultureOrReligion = null,
+            ProviderName = "Nager.Date",
+            SourceUrl = "https://date.nager.at/api/v3/PublicHolidays/2026/CA",
+            TrustLevel = "Verified",
+            DefaultColor = "#2F80ED",
+        },
+        new()
+        {
+            Id = Guid.Parse("10000000-0000-0000-0000-000000000003"),
+            Title = "Common Marketing Moments",
+            Description = "Common retail, awareness, and social planning moments.",
+            Country = null,
+            Region = null,
+            Language = "en",
+            Category = "marketing-moment",
+            CultureOrReligion = null,
+            ProviderName = "Socialize",
+            SourceUrl = "https://example.com/socialize/marketing-moments.ics",
+            TrustLevel = "Maintained",
+            DefaultColor = "#9B51E0",
+        },
+    ];
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Data/CalendarEvent.cs

@@ -0,0 +1,24 @@
+namespace Socialize.Api.Modules.CalendarIntegrations.Data;
+
+internal class CalendarEvent
+{
+    public Guid Id { get; init; }
+    public Guid CalendarSourceId { get; set; }
+    public required string SourceEventUid { get; set; }
+    public required string Title { get; set; }
+    public string? Description { get; set; }
+    public bool IsAllDay { get; set; }
+    public bool IsFloatingTime { get; set; }
+    public DateOnly StartDate { get; set; }
+    public DateOnly EndDate { get; set; }
+    public DateTime? StartLocalDateTime { get; set; }
+    public DateTime? EndLocalDateTime { get; set; }
+    public DateTimeOffset? StartUtc { get; set; }
+    public DateTimeOffset? EndUtc { get; set; }
+    public string? TimeZoneId { get; set; }
+    public string? RecurrenceId { get; set; }
+    public string? Location { get; set; }
+    public string? SourceUrl { get; set; }
+    public DateTimeOffset? SourceLastModifiedAt { get; set; }
+    public DateTimeOffset ImportedAt { get; set; }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Data/CalendarSource.cs

@@ -0,0 +1,22 @@
+namespace Socialize.Api.Modules.CalendarIntegrations.Data;
+
+internal class CalendarSource
+{
+    public Guid Id { get; init; }
+    public required string Scope { get; set; }
+    public Guid? OrganizationId { get; set; }
+    public Guid? WorkspaceId { get; set; }
+    public Guid? UserId { get; set; }
+    public string? SourceUrl { get; set; }
+    public string? CatalogSourceReference { get; set; }
+    public required string DisplayTitle { get; set; }
+    public required string Color { get; set; }
+    public required string Category { get; set; }
+    public bool IsEnabled { get; set; } = true;
+    public string? InheritanceMode { get; set; }
+    public DateTimeOffset? LastSuccessfulSyncAt { get; set; }
+    public DateTimeOffset? LastAttemptedSyncAt { get; set; }
+    public string? LastSyncError { get; set; }
+    public DateTimeOffset CreatedAt { get; init; }
+    public DateTimeOffset UpdatedAt { get; set; }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Data/CalendarSourceModelConfiguration.cs

@@ -0,0 +1,95 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Data;
+
+internal static class CalendarSourceModelConfiguration
+{
+    public static ModelBuilder ConfigureCalendarIntegrationsModule(this ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<CalendarSource>(source =>
+        {
+            source.ToTable("CalendarSources");
+            source.HasKey(x => x.Id);
+            source.Property(x => x.Scope).HasMaxLength(32).IsRequired();
+            source.Property(x => x.SourceUrl).HasMaxLength(2048);
+            source.Property(x => x.CatalogSourceReference).HasMaxLength(256);
+            source.Property(x => x.DisplayTitle).HasMaxLength(256).IsRequired();
+            source.Property(x => x.Color).HasMaxLength(16).IsRequired();
+            source.Property(x => x.Category).HasMaxLength(64).IsRequired();
+            source.Property(x => x.InheritanceMode).HasMaxLength(32);
+            source.Property(x => x.LastSyncError).HasMaxLength(2048);
+            source.Property(x => x.CreatedAt)
+                .ValueGeneratedOnAdd()
+                .HasDefaultValueSql("CURRENT_TIMESTAMP");
+            source.Property(x => x.UpdatedAt)
+                .ValueGeneratedOnAdd()
+                .HasDefaultValueSql("CURRENT_TIMESTAMP");
+
+            source.HasIndex(x => x.Scope);
+            source.HasIndex(x => x.OrganizationId);
+            source.HasIndex(x => x.WorkspaceId);
+            source.HasIndex(x => x.UserId);
+        });
+
+        modelBuilder.Entity<CalendarCatalogEntry>(entry =>
+        {
+            entry.ToTable("CalendarCatalogEntries");
+            entry.HasKey(x => x.Id);
+            entry.Property(x => x.Title).HasMaxLength(256).IsRequired();
+            entry.Property(x => x.Description).HasMaxLength(1024).IsRequired();
+            entry.Property(x => x.Country).HasMaxLength(2);
+            entry.Property(x => x.Region).HasMaxLength(128);
+            entry.Property(x => x.Language).HasMaxLength(16).IsRequired();
+            entry.Property(x => x.Category).HasMaxLength(64).IsRequired();
+            entry.Property(x => x.CultureOrReligion).HasMaxLength(128);
+            entry.Property(x => x.ProviderName).HasMaxLength(128).IsRequired();
+            entry.Property(x => x.SourceUrl).HasMaxLength(2048).IsRequired();
+            entry.Property(x => x.TrustLevel).HasMaxLength(64).IsRequired();
+            entry.Property(x => x.DefaultColor).HasMaxLength(16).IsRequired();
+            entry.Property(x => x.CreatedAt)
+                .ValueGeneratedOnAdd()
+                .HasDefaultValueSql("CURRENT_TIMESTAMP");
+            entry.HasIndex(x => x.Country);
+            entry.HasIndex(x => x.Category);
+            entry.HasIndex(x => x.ProviderName);
+            entry.HasData(CalendarCatalogSeed.Entries);
+        });
+
+        modelBuilder.Entity<CalendarEvent>(calendarEvent =>
+        {
+            calendarEvent.ToTable("CalendarEvents");
+            calendarEvent.HasKey(x => x.Id);
+            calendarEvent.Property(x => x.SourceEventUid).HasMaxLength(512).IsRequired();
+            calendarEvent.Property(x => x.Title).HasMaxLength(512).IsRequired();
+            calendarEvent.Property(x => x.Description).HasMaxLength(4000);
+            calendarEvent.Property(x => x.TimeZoneId).HasMaxLength(128);
+            calendarEvent.Property(x => x.RecurrenceId).HasMaxLength(512);
+            calendarEvent.Property(x => x.Location).HasMaxLength(512);
+            calendarEvent.Property(x => x.SourceUrl).HasMaxLength(2048);
+            calendarEvent.HasIndex(x => x.CalendarSourceId);
+            calendarEvent.HasIndex(x => new { x.CalendarSourceId, x.SourceEventUid, x.StartDate }).IsUnique();
+            calendarEvent.HasOne<CalendarSource>()
+                .WithMany()
+                .HasForeignKey(x => x.CalendarSourceId)
+                .OnDelete(DeleteBehavior.Cascade);
+        });
+
+        modelBuilder.Entity<UserCalendarExportFeed>(feed =>
+        {
+            feed.ToTable("UserCalendarExportFeeds");
+            feed.HasKey(x => x.Id);
+            feed.Property(x => x.Token).HasMaxLength(96);
+            feed.Property(x => x.TokenHash).HasMaxLength(64);
+            feed.Property(x => x.CreatedAt)
+                .ValueGeneratedOnAdd()
+                .HasDefaultValueSql("CURRENT_TIMESTAMP");
+            feed.Property(x => x.UpdatedAt)
+                .ValueGeneratedOnAdd()
+                .HasDefaultValueSql("CURRENT_TIMESTAMP");
+            feed.HasIndex(x => x.UserId).IsUnique();
+            feed.HasIndex(x => x.TokenHash).IsUnique();
+        });
+
+        return modelBuilder;
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Data/UserCalendarExportFeed.cs

@@ -0,0 +1,12 @@
+namespace Socialize.Api.Modules.CalendarIntegrations.Data;
+
+internal class UserCalendarExportFeed
+{
+    public Guid Id { get; init; }
+    public Guid UserId { get; set; }
+    public string? Token { get; set; }
+    public string? TokenHash { get; set; }
+    public DateTimeOffset CreatedAt { get; init; }
+    public DateTimeOffset UpdatedAt { get; set; }
+    public DateTimeOffset? RevokedAt { get; set; }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Handlers/CalendarSourceDtos.cs

@@ -0,0 +1,112 @@
+using Socialize.Api.Modules.CalendarIntegrations.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Services;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Handlers;
+
+internal record CalendarSourceDto(
+    Guid Id,
+    string Scope,
+    Guid? OrganizationId,
+    Guid? WorkspaceId,
+    Guid? UserId,
+    string? SourceUrl,
+    string? CatalogSourceReference,
+    string DisplayTitle,
+    string Color,
+    string Category,
+    bool IsEnabled,
+    string? InheritanceMode,
+    bool IsReadOnly,
+    DateTimeOffset? LastSuccessfulSyncAt,
+    DateTimeOffset? LastAttemptedSyncAt,
+    string? LastSyncError,
+    DateTimeOffset CreatedAt,
+    DateTimeOffset UpdatedAt)
+{
+    public static CalendarSourceDto FromSource(CalendarSource source, bool isReadOnly)
+    {
+        return new CalendarSourceDto(
+            source.Id,
+            source.Scope,
+            source.OrganizationId,
+            source.WorkspaceId,
+            source.UserId,
+            source.SourceUrl,
+            source.CatalogSourceReference,
+            source.DisplayTitle,
+            source.Color,
+            source.Category,
+            source.IsEnabled,
+            source.InheritanceMode,
+            isReadOnly,
+            source.LastSuccessfulSyncAt,
+            source.LastAttemptedSyncAt,
+            source.LastSyncError,
+            source.CreatedAt,
+            source.UpdatedAt);
+    }
+}
+
+internal record UpsertCalendarSourceRequest(
+    string Scope,
+    Guid? OrganizationId,
+    Guid? WorkspaceId,
+    string? SourceUrl,
+    string? CatalogSourceReference,
+    string DisplayTitle,
+    string Color,
+    string Category,
+    bool IsEnabled,
+    string? InheritanceMode);
+
+internal class UpsertCalendarSourceRequestValidator
+    : FastEndpoints.Validator<UpsertCalendarSourceRequest>
+{
+    public UpsertCalendarSourceRequestValidator()
+    {
+        RuleFor(x => x.Scope)
+            .NotEmpty()
+            .Must(CalendarSourceRules.IsSupportedScope)
+            .WithMessage("A valid calendar source scope should be specified.");
+
+        RuleFor(x => x.DisplayTitle).NotEmpty().MaximumLength(256);
+        RuleFor(x => x.Category).NotEmpty().MaximumLength(64);
+        RuleFor(x => x.Color)
+            .NotEmpty()
+            .Matches("^#[0-9A-Fa-f]{6}$")
+            .WithMessage("Color should be a six digit hex color, for example #2F80ED.");
+
+        RuleFor(x => x.SourceUrl)
+            .MaximumLength(2048)
+            .Must(value => string.IsNullOrWhiteSpace(value) || Uri.TryCreate(value, UriKind.Absolute, out Uri? uri) &&
+                (uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps))
+            .WithMessage("Source URL should be an absolute HTTP or HTTPS URL.");
+
+        RuleFor(x => x.CatalogSourceReference).MaximumLength(256);
+
+        RuleFor(x => x)
+            .Must(x => !string.IsNullOrWhiteSpace(x.SourceUrl) || !string.IsNullOrWhiteSpace(x.CatalogSourceReference))
+            .WithMessage("A source URL or catalog source reference should be specified.");
+
+        RuleFor(x => x)
+            .Must(x => x.Scope != CalendarSourceScopes.Organization || x.OrganizationId.HasValue)
+            .WithMessage("Organization calendar sources require an organization id.");
+
+        RuleFor(x => x)
+            .Must(x => x.Scope != CalendarSourceScopes.Workspace || x.WorkspaceId.HasValue)
+            .WithMessage("Workspace calendar sources require a workspace id.");
+
+        RuleFor(x => x)
+            .Must(x => x.Scope != CalendarSourceScopes.User || (!x.OrganizationId.HasValue && !x.WorkspaceId.HasValue))
+            .WithMessage("User calendar sources should not include organization or workspace ids.");
+
+        RuleFor(x => x)
+            .Must(x => x.Scope == CalendarSourceScopes.Organization ||
+                (!x.OrganizationId.HasValue && string.IsNullOrWhiteSpace(x.InheritanceMode)))
+            .WithMessage("Only organization calendar sources can set organization ids or inheritance modes.");
+
+        RuleFor(x => x.InheritanceMode)
+            .Must(value => string.IsNullOrWhiteSpace(value) || CalendarSourceRules.IsSupportedInheritanceMode(value))
+            .WithMessage("A valid inheritance mode should be specified.");
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Handlers/CreateCalendarSource.cs

@@ -0,0 +1,132 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Security;
+using Socialize.Api.Modules.CalendarIntegrations.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Services;
+using Socialize.Api.Modules.Organizations.Services;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Handlers;
+
+internal class CreateCalendarSourceHandler(
+    AppDbContext dbContext,
+    AccessScopeService accessScopeService,
+    OrganizationAccessService organizationAccessService)
+    : Endpoint<UpsertCalendarSourceRequest, CalendarSourceDto>
+{
+    public override void Configure()
+    {
+        Post("/api/calendar-integrations/sources");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(UpsertCalendarSourceRequest request, CancellationToken ct)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+
+        Guid currentUserId = User.GetUserId();
+        string scope = request.Scope.Trim();
+        Guid? organizationId = request.OrganizationId;
+        Guid? workspaceId = request.WorkspaceId;
+
+        if (!await CanCreateAsync(scope, organizationId, workspaceId, currentUserId, ct))
+        {
+            await SendForbiddenAsync(ct);
+            return;
+        }
+
+        string? sourceUrl = NormalizeOptional(request.SourceUrl);
+        string? catalogSourceReference = NormalizeOptional(request.CatalogSourceReference);
+        if (await SourceAlreadyExistsAsync(scope, organizationId, workspaceId, currentUserId, sourceUrl, catalogSourceReference, ct))
+        {
+            AddError(request => request.SourceUrl, "This calendar source has already been added.");
+            await SendErrorsAsync(cancellation: ct);
+            return;
+        }
+
+        CalendarSource source = new()
+        {
+            Id = Guid.NewGuid(),
+            Scope = scope,
+            OrganizationId = scope == CalendarSourceScopes.Organization ? organizationId : null,
+            WorkspaceId = scope == CalendarSourceScopes.Workspace ? workspaceId : null,
+            UserId = scope == CalendarSourceScopes.User ? currentUserId : null,
+            SourceUrl = sourceUrl,
+            CatalogSourceReference = catalogSourceReference,
+            DisplayTitle = request.DisplayTitle.Trim(),
+            Color = request.Color.Trim(),
+            Category = request.Category.Trim(),
+            IsEnabled = request.IsEnabled,
+            InheritanceMode = scope == CalendarSourceScopes.Organization
+                ? NormalizeOptional(request.InheritanceMode) ?? CalendarSourceInheritanceModes.Optional
+                : null,
+            UpdatedAt = DateTimeOffset.UtcNow,
+        };
+
+        dbContext.CalendarSources.Add(source);
+        await dbContext.SaveChangesAsync(ct);
+
+        await SendAsync(CalendarSourceDto.FromSource(source, isReadOnly: false), StatusCodes.Status201Created, ct);
+    }
+
+    private async Task<bool> CanCreateAsync(
+        string scope,
+        Guid? organizationId,
+        Guid? workspaceId,
+        Guid currentUserId,
+        CancellationToken ct)
+    {
+        return scope switch
+        {
+            CalendarSourceScopes.Organization when organizationId.HasValue =>
+                await dbContext.Organizations.AnyAsync(organization => organization.Id == organizationId.Value, ct) &&
+                await organizationAccessService.HasOrganizationPermissionAsync(
+                    User,
+                    organizationId.Value,
+                    OrganizationPermissions.ManageConnectors,
+                    ct),
+            CalendarSourceScopes.Workspace when workspaceId.HasValue =>
+                await dbContext.Workspaces.AnyAsync(workspace => workspace.Id == workspaceId.Value, ct) &&
+                await accessScopeService.CanManageWorkspaceAsync(User, workspaceId.Value, ct),
+            CalendarSourceScopes.User => currentUserId != Guid.Empty,
+            _ => false,
+        };
+    }
+
+    private Task<bool> SourceAlreadyExistsAsync(
+        string scope,
+        Guid? organizationId,
+        Guid? workspaceId,
+        Guid currentUserId,
+        string? sourceUrl,
+        string? catalogSourceReference,
+        CancellationToken ct)
+    {
+        IQueryable<CalendarSource> query = dbContext.CalendarSources
+            .Where(source => source.Scope == scope);
+
+        query = scope switch
+        {
+            CalendarSourceScopes.Organization => query.Where(source => source.OrganizationId == organizationId),
+            CalendarSourceScopes.Workspace => query.Where(source => source.WorkspaceId == workspaceId),
+            CalendarSourceScopes.User => query.Where(source => source.UserId == currentUserId),
+            _ => query.Where(_ => false),
+        };
+
+        string? normalizedUrl = sourceUrl?.Trim();
+        string? normalizedCatalogReference = catalogSourceReference?.Trim();
+
+        return query.AnyAsync(source =>
+            (!string.IsNullOrWhiteSpace(normalizedCatalogReference) &&
+             source.CatalogSourceReference == normalizedCatalogReference) ||
+            (!string.IsNullOrWhiteSpace(normalizedUrl) &&
+             source.SourceUrl != null &&
+             EF.Functions.ILike(source.SourceUrl, normalizedUrl)),
+            ct);
+    }
+
+    private static string? NormalizeOptional(string? value)
+    {
+        return string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Handlers/DeleteCalendarSource.cs

@@ -0,0 +1,64 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Security;
+using Socialize.Api.Modules.CalendarIntegrations.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Services;
+using Socialize.Api.Modules.Organizations.Services;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Handlers;
+
+internal class DeleteCalendarSourceHandler(
+    AppDbContext dbContext,
+    AccessScopeService accessScopeService,
+    OrganizationAccessService organizationAccessService)
+    : EndpointWithoutRequest
+{
+    public override void Configure()
+    {
+        Delete("/api/calendar-integrations/sources/{sourceId:guid}");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        Guid sourceId = Route<Guid>("sourceId");
+        CalendarSource? source = await dbContext.CalendarSources.SingleOrDefaultAsync(candidate => candidate.Id == sourceId, ct);
+        if (source is null)
+        {
+            await SendNotFoundAsync(ct);
+            return;
+        }
+
+        if (!await CanManageExistingSourceAsync(source, User.GetUserId(), ct))
+        {
+            await SendForbiddenAsync(ct);
+            return;
+        }
+
+        dbContext.CalendarSources.Remove(source);
+        await dbContext.SaveChangesAsync(ct);
+
+        await SendNoContentAsync(ct);
+    }
+
+    private async Task<bool> CanManageExistingSourceAsync(
+        CalendarSource source,
+        Guid currentUserId,
+        CancellationToken ct)
+    {
+        return source.Scope switch
+        {
+            CalendarSourceScopes.Organization when source.OrganizationId.HasValue =>
+                await organizationAccessService.HasOrganizationPermissionAsync(
+                    User,
+                    source.OrganizationId.Value,
+                    OrganizationPermissions.ManageConnectors,
+                    ct),
+            CalendarSourceScopes.Workspace when source.WorkspaceId.HasValue =>
+                await accessScopeService.CanManageWorkspaceAsync(User, source.WorkspaceId.Value, ct),
+            CalendarSourceScopes.User => source.UserId == currentUserId,
+            _ => false,
+        };
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Handlers/ListCalendarCatalog.cs

@@ -0,0 +1,115 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Data;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Handlers;
+
+internal sealed class ListCalendarCatalogRequest
+{
+    public string? Search { get; set; }
+    public string? Country { get; set; }
+    public string? Region { get; set; }
+    public string? Language { get; set; }
+    public string? Category { get; set; }
+    public string? CultureOrReligion { get; set; }
+    public string? Provider { get; set; }
+}
+
+internal record CalendarCatalogEntryDto(
+    Guid Id,
+    string Title,
+    string Description,
+    string? Country,
+    string? Region,
+    string Language,
+    string Category,
+    string? CultureOrReligion,
+    string ProviderName,
+    string SourceUrl,
+    string TrustLevel,
+    string DefaultColor);
+
+internal class ListCalendarCatalogHandler(AppDbContext dbContext)
+    : Endpoint<ListCalendarCatalogRequest, IReadOnlyCollection<CalendarCatalogEntryDto>>
+{
+    public override void Configure()
+    {
+        Get("/api/calendar-integrations/catalog");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(ListCalendarCatalogRequest request, CancellationToken ct)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+
+        IQueryable<CalendarCatalogEntry> query = dbContext.CalendarCatalogEntries.AsQueryable();
+
+        if (!string.IsNullOrWhiteSpace(request.Search))
+        {
+            string search = $"%{request.Search.Trim()}%";
+            query = query.Where(entry =>
+                EF.Functions.ILike(entry.Title, search) ||
+                EF.Functions.ILike(entry.Description, search) ||
+                EF.Functions.ILike(entry.ProviderName, search));
+        }
+
+        if (!string.IsNullOrWhiteSpace(request.Country))
+        {
+            string country = request.Country.Trim().ToUpperInvariant();
+            query = query.Where(entry => entry.Country == country);
+        }
+
+        if (!string.IsNullOrWhiteSpace(request.Region))
+        {
+            string region = request.Region.Trim();
+            query = query.Where(entry => entry.Region == region);
+        }
+
+        if (!string.IsNullOrWhiteSpace(request.Language))
+        {
+            string language = request.Language.Trim();
+            query = query.Where(entry => entry.Language == language);
+        }
+
+        if (!string.IsNullOrWhiteSpace(request.Category))
+        {
+            string category = request.Category.Trim();
+            query = query.Where(entry => entry.Category == category);
+        }
+
+        if (!string.IsNullOrWhiteSpace(request.CultureOrReligion))
+        {
+            string cultureOrReligion = request.CultureOrReligion.Trim();
+            query = query.Where(entry => entry.CultureOrReligion == cultureOrReligion);
+        }
+
+        if (!string.IsNullOrWhiteSpace(request.Provider))
+        {
+            string provider = request.Provider.Trim();
+            query = query.Where(entry => entry.ProviderName == provider);
+        }
+
+        CalendarCatalogEntryDto[] entries = await query
+            .OrderBy(entry => entry.Country)
+            .ThenBy(entry => entry.Category)
+            .ThenBy(entry => entry.Title)
+            .Take(100)
+            .Select(entry => new CalendarCatalogEntryDto(
+                entry.Id,
+                entry.Title,
+                entry.Description,
+                entry.Country,
+                entry.Region,
+                entry.Language,
+                entry.Category,
+                entry.CultureOrReligion,
+                entry.ProviderName,
+                entry.SourceUrl,
+                entry.TrustLevel,
+                entry.DefaultColor))
+            .ToArrayAsync(ct);
+
+        await SendOkAsync(entries, ct);
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Handlers/ListCalendarEvents.cs

@@ -0,0 +1,133 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Security;
+using Socialize.Api.Modules.CalendarIntegrations.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Services;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Handlers;
+
+internal sealed class ListCalendarEventsRequest
+{
+    public Guid? WorkspaceId { get; set; }
+    public DateOnly? StartDate { get; set; }
+    public DateOnly? EndDate { get; set; }
+}
+
+internal record CalendarEventDto(
+    Guid Id,
+    Guid CalendarSourceId,
+    string SourceEventUid,
+    string Title,
+    string? Description,
+    bool IsAllDay,
+    bool IsFloatingTime,
+    DateOnly StartDate,
+    DateOnly EndDate,
+    DateTime? StartLocalDateTime,
+    DateTime? EndLocalDateTime,
+    DateTimeOffset? StartUtc,
+    DateTimeOffset? EndUtc,
+    string? TimeZoneId,
+    string? RecurrenceId,
+    string? Location,
+    string? SourceUrl,
+    DateTimeOffset? SourceLastModifiedAt,
+    DateTimeOffset ImportedAt);
+
+internal class ListCalendarEventsHandler(
+    AppDbContext dbContext,
+    AccessScopeService accessScopeService)
+    : Endpoint<ListCalendarEventsRequest, IReadOnlyCollection<CalendarEventDto>>
+{
+    public override void Configure()
+    {
+        Get("/api/calendar-integrations/events");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(ListCalendarEventsRequest request, CancellationToken ct)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+
+        Guid currentUserId = User.GetUserId();
+        DateOnly startDate = request.StartDate ?? DateOnly.FromDateTime(DateTime.UtcNow.Date.AddMonths(-1));
+        DateOnly endDate = request.EndDate ?? DateOnly.FromDateTime(DateTime.UtcNow.Date.AddMonths(3));
+
+        if (request.WorkspaceId.HasValue &&
+            !await accessScopeService.CanAccessWorkspaceAsync(User, request.WorkspaceId.Value, ct))
+        {
+            await SendForbiddenAsync(ct);
+            return;
+        }
+
+        IQueryable<CalendarSource> visibleSources = dbContext.CalendarSources
+            .Where(source => source.IsEnabled);
+
+        if (request.WorkspaceId.HasValue)
+        {
+            Guid? organizationId = await dbContext.Workspaces
+                .Where(workspace => workspace.Id == request.WorkspaceId.Value)
+                .Select(workspace => (Guid?)workspace.OrganizationId)
+                .SingleOrDefaultAsync(ct);
+
+            if (!organizationId.HasValue)
+            {
+                await SendNotFoundAsync(ct);
+                return;
+            }
+
+            visibleSources = visibleSources.Where(source =>
+                source.Scope == CalendarSourceScopes.Organization && source.OrganizationId == organizationId ||
+                source.Scope == CalendarSourceScopes.Workspace && source.WorkspaceId == request.WorkspaceId ||
+                source.Scope == CalendarSourceScopes.User && source.UserId == currentUserId);
+        }
+        else
+        {
+            IReadOnlyCollection<Guid> workspaceIds = await accessScopeService.GetAccessibleWorkspaceIdsAsync(User, ct);
+            Guid[] organizationIds = await dbContext.Workspaces
+                .Where(workspace => workspaceIds.Contains(workspace.Id))
+                .Select(workspace => workspace.OrganizationId)
+                .Distinct()
+                .ToArrayAsync(ct);
+
+            visibleSources = visibleSources.Where(source =>
+                source.Scope == CalendarSourceScopes.Organization && source.OrganizationId.HasValue && organizationIds.Contains(source.OrganizationId.Value) ||
+                source.Scope == CalendarSourceScopes.Workspace && source.WorkspaceId.HasValue && workspaceIds.Contains(source.WorkspaceId.Value) ||
+                source.Scope == CalendarSourceScopes.User && source.UserId == currentUserId);
+        }
+
+        Guid[] sourceIds = await visibleSources
+            .Select(source => source.Id)
+            .ToArrayAsync(ct);
+
+        CalendarEventDto[] events = await dbContext.CalendarEvents
+            .Where(calendarEvent => sourceIds.Contains(calendarEvent.CalendarSourceId))
+            .Where(calendarEvent => calendarEvent.StartDate <= endDate && calendarEvent.EndDate >= startDate)
+            .OrderBy(calendarEvent => calendarEvent.StartDate)
+            .ThenBy(calendarEvent => calendarEvent.Title)
+            .Select(calendarEvent => new CalendarEventDto(
+                calendarEvent.Id,
+                calendarEvent.CalendarSourceId,
+                calendarEvent.SourceEventUid,
+                calendarEvent.Title,
+                calendarEvent.Description,
+                calendarEvent.IsAllDay,
+                calendarEvent.IsFloatingTime,
+                calendarEvent.StartDate,
+                calendarEvent.EndDate,
+                calendarEvent.StartLocalDateTime,
+                calendarEvent.EndLocalDateTime,
+                calendarEvent.StartUtc,
+                calendarEvent.EndUtc,
+                calendarEvent.TimeZoneId,
+                calendarEvent.RecurrenceId,
+                calendarEvent.Location,
+                calendarEvent.SourceUrl,
+                calendarEvent.SourceLastModifiedAt,
+                calendarEvent.ImportedAt))
+            .ToArrayAsync(ct);
+
+        await SendOkAsync(events, ct);
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Handlers/ListCalendarSources.cs

@@ -0,0 +1,77 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Security;
+using Socialize.Api.Modules.CalendarIntegrations.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Services;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Handlers;
+
+internal record ListCalendarSourcesRequest(Guid? WorkspaceId);
+
+internal class ListCalendarSourcesHandler(
+    AppDbContext dbContext,
+    AccessScopeService accessScopeService)
+    : Endpoint<ListCalendarSourcesRequest, IReadOnlyCollection<CalendarSourceDto>>
+{
+    public override void Configure()
+    {
+        Get("/api/calendar-integrations/sources");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(ListCalendarSourcesRequest request, CancellationToken ct)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+
+        Guid currentUserId = User.GetUserId();
+        List<CalendarSource> sources;
+
+        if (request.WorkspaceId.HasValue)
+        {
+            var workspace = await dbContext.Workspaces
+                .Where(candidate => candidate.Id == request.WorkspaceId.Value)
+                .Select(candidate => new { candidate.Id, candidate.OrganizationId })
+                .SingleOrDefaultAsync(ct);
+
+            if (workspace is null)
+            {
+                await SendNotFoundAsync(ct);
+                return;
+            }
+
+            if (!await accessScopeService.CanAccessWorkspaceAsync(User, workspace.Id, ct))
+            {
+                await SendForbiddenAsync(ct);
+                return;
+            }
+
+            sources = await dbContext.CalendarSources
+                .Where(source =>
+                    source.Scope == CalendarSourceScopes.Organization && source.OrganizationId == workspace.OrganizationId ||
+                    source.Scope == CalendarSourceScopes.Workspace && source.WorkspaceId == workspace.Id ||
+                    source.Scope == CalendarSourceScopes.User && source.UserId == currentUserId)
+                .OrderBy(source => source.Scope)
+                .ThenBy(source => source.DisplayTitle)
+                .ToListAsync(ct);
+
+            await SendOkAsync(
+                sources
+                    .Select(source => CalendarSourceDto.FromSource(
+                        source,
+                        CalendarSourceRules.IsInheritedOrganizationSource(source, workspace.OrganizationId)))
+                    .ToArray(),
+                ct);
+            return;
+        }
+
+        sources = await dbContext.CalendarSources
+            .Where(source => source.Scope == CalendarSourceScopes.User && source.UserId == currentUserId)
+            .OrderBy(source => source.DisplayTitle)
+            .ToListAsync(ct);
+
+        await SendOkAsync(
+            sources.Select(source => CalendarSourceDto.FromSource(source, isReadOnly: false)).ToArray(),
+            ct);
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Handlers/RefreshCalendarSource.cs

@@ -0,0 +1,65 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Security;
+using Socialize.Api.Modules.CalendarIntegrations.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Services;
+using Socialize.Api.Modules.Organizations.Services;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Handlers;
+
+internal class RefreshCalendarSourceHandler(
+    AppDbContext dbContext,
+    AccessScopeService accessScopeService,
+    OrganizationAccessService organizationAccessService,
+    CalendarImportSyncService syncService)
+    : EndpointWithoutRequest<CalendarSourceDto>
+{
+    public override void Configure()
+    {
+        Post("/api/calendar-integrations/sources/{sourceId:guid}/refresh");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        Guid sourceId = Route<Guid>("sourceId");
+        CalendarSource? source = await dbContext.CalendarSources.SingleOrDefaultAsync(candidate => candidate.Id == sourceId, ct);
+        if (source is null)
+        {
+            await SendNotFoundAsync(ct);
+            return;
+        }
+
+        if (!await CanManageExistingSourceAsync(source, User.GetUserId(), ct))
+        {
+            await SendForbiddenAsync(ct);
+            return;
+        }
+
+        await syncService.RefreshSourceAsync(source.Id, ct);
+        await dbContext.Entry(source).ReloadAsync(ct);
+
+        await SendOkAsync(CalendarSourceDto.FromSource(source, isReadOnly: false), ct);
+    }
+
+    private async Task<bool> CanManageExistingSourceAsync(
+        CalendarSource source,
+        Guid currentUserId,
+        CancellationToken ct)
+    {
+        return source.Scope switch
+        {
+            CalendarSourceScopes.Organization when source.OrganizationId.HasValue =>
+                await organizationAccessService.HasOrganizationPermissionAsync(
+                    User,
+                    source.OrganizationId.Value,
+                    OrganizationPermissions.ManageConnectors,
+                    ct),
+            CalendarSourceScopes.Workspace when source.WorkspaceId.HasValue =>
+                await accessScopeService.CanManageWorkspaceAsync(User, source.WorkspaceId.Value, ct),
+            CalendarSourceScopes.User => source.UserId == currentUserId,
+            _ => false,
+        };
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Handlers/UpdateCalendarSource.cs

@@ -0,0 +1,91 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Security;
+using Socialize.Api.Modules.CalendarIntegrations.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Services;
+using Socialize.Api.Modules.Organizations.Services;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Handlers;
+
+internal class UpdateCalendarSourceHandler(
+    AppDbContext dbContext,
+    AccessScopeService accessScopeService,
+    OrganizationAccessService organizationAccessService)
+    : Endpoint<UpsertCalendarSourceRequest, CalendarSourceDto>
+{
+    public override void Configure()
+    {
+        Put("/api/calendar-integrations/sources/{sourceId:guid}");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(UpsertCalendarSourceRequest request, CancellationToken ct)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+
+        Guid sourceId = Route<Guid>("sourceId");
+        CalendarSource? source = await dbContext.CalendarSources.SingleOrDefaultAsync(candidate => candidate.Id == sourceId, ct);
+        if (source is null)
+        {
+            await SendNotFoundAsync(ct);
+            return;
+        }
+
+        Guid currentUserId = User.GetUserId();
+        if (!await CanManageExistingSourceAsync(source, currentUserId, ct))
+        {
+            await SendForbiddenAsync(ct);
+            return;
+        }
+
+        if (source.Scope != request.Scope.Trim() ||
+            source.OrganizationId != (request.Scope == CalendarSourceScopes.Organization ? request.OrganizationId : null) ||
+            source.WorkspaceId != (request.Scope == CalendarSourceScopes.Workspace ? request.WorkspaceId : null))
+        {
+            AddError("Calendar source scope cannot be changed.");
+            await SendErrorsAsync(StatusCodes.Status409Conflict, ct);
+            return;
+        }
+
+        source.SourceUrl = NormalizeOptional(request.SourceUrl);
+        source.CatalogSourceReference = NormalizeOptional(request.CatalogSourceReference);
+        source.DisplayTitle = request.DisplayTitle.Trim();
+        source.Color = request.Color.Trim();
+        source.Category = request.Category.Trim();
+        source.IsEnabled = request.IsEnabled;
+        source.InheritanceMode = source.Scope == CalendarSourceScopes.Organization
+            ? NormalizeOptional(request.InheritanceMode) ?? CalendarSourceInheritanceModes.Optional
+            : null;
+        source.UpdatedAt = DateTimeOffset.UtcNow;
+
+        await dbContext.SaveChangesAsync(ct);
+
+        await SendOkAsync(CalendarSourceDto.FromSource(source, isReadOnly: false), ct);
+    }
+
+    private async Task<bool> CanManageExistingSourceAsync(
+        CalendarSource source,
+        Guid currentUserId,
+        CancellationToken ct)
+    {
+        return source.Scope switch
+        {
+            CalendarSourceScopes.Organization when source.OrganizationId.HasValue =>
+                await organizationAccessService.HasOrganizationPermissionAsync(
+                    User,
+                    source.OrganizationId.Value,
+                    OrganizationPermissions.ManageConnectors,
+                    ct),
+            CalendarSourceScopes.Workspace when source.WorkspaceId.HasValue =>
+                await accessScopeService.CanManageWorkspaceAsync(User, source.WorkspaceId.Value, ct),
+            CalendarSourceScopes.User => source.UserId == currentUserId,
+            _ => false,
+        };
+    }
+
+    private static string? NormalizeOptional(string? value)
+    {
+        return string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Handlers/UserCalendarExportFeed.cs

@@ -0,0 +1,224 @@
+using FastEndpoints;
+using Microsoft.EntityFrameworkCore;
+using Socialize.Api.Data;
+using Socialize.Api.Infrastructure.Security;
+using Socialize.Api.Modules.CalendarIntegrations.Data;
+using Socialize.Api.Modules.CalendarIntegrations.Services;
+using Socialize.Api.Modules.Identity.Data;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Handlers;
+
+internal record UserCalendarExportFeedDto(
+    bool IsEnabled,
+    string? FeedUrl,
+    DateTimeOffset? CreatedAt,
+    DateTimeOffset? UpdatedAt,
+    DateTimeOffset? RevokedAt);
+
+internal class GetUserCalendarExportFeedHandler(AppDbContext dbContext)
+    : EndpointWithoutRequest<UserCalendarExportFeedDto>
+{
+    public override void Configure()
+    {
+        Get("/api/calendar-integrations/export-feed");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        UserCalendarExportFeed? feed = await dbContext.UserCalendarExportFeeds
+            .SingleOrDefaultAsync(candidate => candidate.UserId == User.GetUserId(), ct);
+
+        await SendAsync(UserCalendarExportFeedMapper.ToDto(feed, UserCalendarExportFeedMapper.BuildFeedUrl(feed)), cancellation: ct);
+    }
+}
+
+internal class EnableUserCalendarExportFeedHandler(AppDbContext dbContext)
+    : EndpointWithoutRequest<UserCalendarExportFeedDto>
+{
+    public override void Configure()
+    {
+        Post("/api/calendar-integrations/export-feed/enable");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        Guid userId = User.GetUserId();
+        string token = CalendarExportFeedTokenService.GenerateToken();
+        string tokenHash = CalendarExportFeedTokenService.HashToken(token);
+        DateTimeOffset now = DateTimeOffset.UtcNow;
+
+        UserCalendarExportFeed? feed = await dbContext.UserCalendarExportFeeds
+            .SingleOrDefaultAsync(candidate => candidate.UserId == userId, ct);
+
+        if (feed is null)
+        {
+            feed = new UserCalendarExportFeed
+            {
+                Id = Guid.NewGuid(),
+                UserId = userId,
+                Token = token,
+                TokenHash = tokenHash,
+                UpdatedAt = now,
+            };
+            dbContext.UserCalendarExportFeeds.Add(feed);
+        }
+        else if (feed.TokenHash is null || feed.RevokedAt.HasValue)
+        {
+            feed.Token = token;
+            feed.TokenHash = tokenHash;
+            feed.RevokedAt = null;
+            feed.UpdatedAt = now;
+        }
+        else
+        {
+            token = string.Empty;
+        }
+
+        await dbContext.SaveChangesAsync(ct);
+        await SendAsync(UserCalendarExportFeedMapper.ToDto(feed, UserCalendarExportFeedMapper.BuildFeedUrl(feed, token)), cancellation: ct);
+    }
+}
+
+internal class RegenerateUserCalendarExportFeedHandler(AppDbContext dbContext)
+    : EndpointWithoutRequest<UserCalendarExportFeedDto>
+{
+    public override void Configure()
+    {
+        Post("/api/calendar-integrations/export-feed/regenerate");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        Guid userId = User.GetUserId();
+        string token = CalendarExportFeedTokenService.GenerateToken();
+        DateTimeOffset now = DateTimeOffset.UtcNow;
+
+        UserCalendarExportFeed? feed = await dbContext.UserCalendarExportFeeds
+            .SingleOrDefaultAsync(candidate => candidate.UserId == userId, ct);
+
+        if (feed is null)
+        {
+            feed = new UserCalendarExportFeed
+            {
+                Id = Guid.NewGuid(),
+                UserId = userId,
+                UpdatedAt = now,
+            };
+            dbContext.UserCalendarExportFeeds.Add(feed);
+        }
+
+        feed.TokenHash = CalendarExportFeedTokenService.HashToken(token);
+        feed.Token = token;
+        feed.RevokedAt = null;
+        feed.UpdatedAt = now;
+
+        await dbContext.SaveChangesAsync(ct);
+        await SendAsync(UserCalendarExportFeedMapper.ToDto(feed, UserCalendarExportFeedMapper.BuildFeedUrl(feed, token)), cancellation: ct);
+    }
+}
+
+internal class RevokeUserCalendarExportFeedHandler(AppDbContext dbContext)
+    : EndpointWithoutRequest<UserCalendarExportFeedDto>
+{
+    public override void Configure()
+    {
+        Delete("/api/calendar-integrations/export-feed");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        UserCalendarExportFeed? feed = await dbContext.UserCalendarExportFeeds
+            .SingleOrDefaultAsync(candidate => candidate.UserId == User.GetUserId(), ct);
+
+        if (feed is not null)
+        {
+            feed.TokenHash = null;
+            feed.Token = null;
+            feed.RevokedAt = DateTimeOffset.UtcNow;
+            feed.UpdatedAt = feed.RevokedAt.Value;
+            await dbContext.SaveChangesAsync(ct);
+        }
+
+        await SendAsync(UserCalendarExportFeedMapper.ToDto(feed, null), cancellation: ct);
+    }
+}
+
+internal class GetUserCalendarExportFeedIcsHandler(
+    AppDbContext dbContext,
+    CalendarExportFeedService feedService)
+    : EndpointWithoutRequest
+{
+    public override void Configure()
+    {
+        AllowAnonymous();
+        Get("/api/calendar-integrations/export-feed/{token}.ics");
+        Options(o => o.WithTags("Calendar Integrations"));
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        string? token = Route<string?>("token");
+        if (string.IsNullOrWhiteSpace(token))
+        {
+            await SendNotFoundAsync(ct);
+            return;
+        }
+
+        string tokenHash = CalendarExportFeedTokenService.HashToken(token);
+
+        UserCalendarExportFeed? feed = await dbContext.UserCalendarExportFeeds
+            .SingleOrDefaultAsync(candidate =>
+                candidate.TokenHash == tokenHash &&
+                !candidate.RevokedAt.HasValue,
+                ct);
+
+        if (feed is null)
+        {
+            await SendNotFoundAsync(ct);
+            return;
+        }
+
+        User? user = await dbContext.Users.SingleOrDefaultAsync(candidate => candidate.Id == feed.UserId, ct);
+        if (user is null)
+        {
+            await SendNotFoundAsync(ct);
+            return;
+        }
+
+        string appBaseUrl = $"{HttpContext.Request.Scheme}://{HttpContext.Request.Host}";
+        string ics = await feedService.BuildUserFeedAsync(feed.UserId, user.Email, appBaseUrl, ct);
+
+        HttpContext.Response.ContentType = "text/calendar; charset=utf-8";
+        await HttpContext.Response.WriteAsync(ics, ct);
+    }
+}
+
+file static class UserCalendarExportFeedMapper
+{
+    public static UserCalendarExportFeedDto ToDto(UserCalendarExportFeed? feed, string? feedUrl)
+    {
+        return new UserCalendarExportFeedDto(
+            feed?.TokenHash is not null && !feed.RevokedAt.HasValue,
+            feedUrl,
+            feed?.CreatedAt,
+            feed?.UpdatedAt,
+            feed?.RevokedAt);
+    }
+
+    public static string? BuildFeedUrl(UserCalendarExportFeed? feed, string? token = null)
+    {
+        if (feed?.TokenHash is null || feed.RevokedAt.HasValue)
+        {
+            return null;
+        }
+
+        string effectiveToken = string.IsNullOrWhiteSpace(token) ? feed.Token ?? string.Empty : token;
+        return string.IsNullOrWhiteSpace(effectiveToken)
+            ? null
+            : $"/api/calendar-integrations/export-feed/{effectiveToken}.ics";
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/ModuleRegistration.cs

@@ -0,0 +1,13 @@
+namespace Socialize.Api.Modules.CalendarIntegrations;
+
+internal static class ModuleRegistration
+{
+    public static WebApplicationBuilder AddCalendarIntegrationsModule(this WebApplicationBuilder builder)
+    {
+        builder.Services.AddScoped<Services.CalendarExportFeedService>();
+        builder.Services.AddScoped<Services.CalendarImportSyncService>();
+        builder.Services.AddHostedService<Services.CalendarImportBackgroundService>();
+
+        return builder;
+    }
+}

backend/src/Socialize.Api/Modules/CalendarIntegrations/Services/CalendarExportFeedBuilder.cs

@@ -0,0 +1,86 @@
+using System.Text;
+using System.Globalization;
+
+namespace Socialize.Api.Modules.CalendarIntegrations.Services;
+
+internal sealed record CalendarExportFeedEvent(
+    string Uid,
+    string Title,
+    DateTimeOffset StartsAt,
+    DateTimeOffset EndsAt,
+    bool IsAllDay,
+    string? Description,
+    string? Url);
+
+internal static class CalendarExportFeedBuilder
+{
+    public static string Build(string calendarName, IReadOnlyCollection<CalendarExportFeedEvent> events)
+    {
+        StringBuilder builder = new();
+        builder.AppendLine("BEGIN:VCALENDAR");
+        builder.AppendLine("VERSION:2.0");
+        builder.AppendLine("PRODID:-//Socialize//User Work Calendar//EN");
+        builder.AppendLine("CALSCALE:GREGORIAN");
+        builder.AppendLine("METHOD:PUBLISH");
+        AppendLineInvariant(builder, $"X-WR-CALNAME:{EscapeText(calendarName)}");
+
+        foreach (CalendarExportFeedEvent feedEvent in events.OrderBy(calendarEvent => calendarEvent.StartsAt))
+        {
+            builder.AppendLine("BEGIN:VEVENT");
+            AppendLineInvariant(builder, $"UID:{EscapeText(feedEvent.Uid)}");
+            AppendLineInvariant(builder, $"DTSTAMP:{FormatUtc(DateTimeOffset.UtcNow)}");
+            AppendLineInvariant(builder, $"SUMMARY:{EscapeText(feedEvent.Title)}");
+
+            if (feedEvent.IsAllDay)
+            {
+                AppendLineInvariant(builder, $"DTSTART;VALUE=DATE:{FormatDate(feedEvent.StartsAt)}");
+                AppendLineInvariant(builder, $"DTEND;VALUE=DATE:{FormatDate(feedEvent.EndsAt)}");
+            }
+            else
+            {
+                AppendLineInvariant(builder, $"DTSTART:{FormatUtc(feedEvent.StartsAt)}");
+                AppendLineInvariant(builder, $"DTEND:{FormatUtc(feedEvent.EndsAt)}");
+            }
+
+            if (!string.IsNullOrWhiteSpace(feedEvent.Description))
+            {
+                AppendLineInvariant(builder, $"DESCRIPTION:{EscapeText(feedEvent.Description)}");
+            }
+
+            if (!string.IsNullOrWhiteSpace(feedEvent.Url))
+            {
+                AppendLineInvariant(builder, $"URL:{EscapeText(feedEvent.Url)}");
+            }
+
+            builder.AppendLine("END:VEVENT");
+        }
+
+        builder.AppendLine("END:VCALENDAR");
+        return builder.ToString();
+    }
+
+    private static string FormatDate(DateTimeOffset value)
+    {
+        return value.ToString("yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture);
+    }
+
+    private static string FormatUtc(DateTimeOffset value)
+    {
+        return value.UtcDateTime.ToString("yyyyMMdd'T'HHmmss'Z'", System.Globalization.CultureInfo.InvariantCulture);
+    }
+
+    private static string EscapeText(string value)
+    {
+        return value
+            .Replace("\\", "\\\\", StringComparison.Ordinal)
+            .Replace("\r\n", "\\n", StringComparison.Ordinal)
+            .Replace("\n", "\\n", StringComparison.Ordinal)
+            .Replace(";", "\\;", StringComparison.Ordinal)
+            .Replace(",", "\\,", StringComparison.Ordinal);
+    }
+
+    private static void AppendLineInvariant(StringBuilder builder, FormattableString value)
+    {
+        builder.AppendLine(value.ToString(CultureInfo.InvariantCulture));
+    }
+}