chore: add missing multi-level editor for approval workflow, rename projects to campaings.

backend/src/Socialize.Api/Modules/Campaigns/Data/Campaign.cs

@@ -0,0 +1,15 @@
+namespace Socialize.Api.Modules.Campaigns.Data;
+
+public class Campaign
+{
+    public Guid Id { get; init; }
+    public Guid WorkspaceId { get; set; }
+    public Guid ClientId { get; set; }
+    public required string Name { get; set; }
+    public string? Description { get; set; }
+    public string? Notes { get; set; }
+    public required string Status { get; set; }
+    public DateTimeOffset StartDate { get; set; }
+    public DateTimeOffset EndDate { get; set; }
+    public DateTimeOffset CreatedAt { get; init; }
+}

backend/src/Socialize.Api/Modules/Campaigns/Data/CampaignModelConfiguration.cs

@@ -0,0 +1,27 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace Socialize.Api.Modules.Campaigns.Data;
+
+public static class CampaignModelConfiguration
+{
+    public static ModelBuilder ConfigureCampaignsModule(this ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Campaign>(campaign =>
+        {
+            campaign.ToTable("Campaigns");
+            campaign.HasKey(x => x.Id);
+            campaign.Property(x => x.Name).HasMaxLength(256).IsRequired();
+            campaign.Property(x => x.Description).HasMaxLength(4000);
+            campaign.Property(x => x.Notes).HasMaxLength(4000);
+            campaign.Property(x => x.Status).HasMaxLength(64).IsRequired();
+            campaign.Property(x => x.CreatedAt)
+                .ValueGeneratedOnAdd()
+                .HasDefaultValueSql("CURRENT_TIMESTAMP");
+            campaign.HasIndex(x => new { x.ClientId, x.Name }).IsUnique();
+            campaign.HasIndex(x => x.WorkspaceId);
+            campaign.HasIndex(x => x.ClientId);
+        });
+
+        return modelBuilder;
+    }
+}