The MessageSystem is based on Subject instead of Content (just semantics)

src/Web/Messages/Data/Message.cs

@@ -3,11 +3,9 @@
 public class Message
 {
     public Guid Id { get; init; }
-    public Guid ContentId { get; init; } // works for any - VideoId, ChatId, RoomId, xxxId, ForumId
+    public Guid SubjectId { get; init; }
     public Guid CreatedBy { get; init; }
     public DateTime CreatedAt { get; }
-
     public Guid ParentId { get; init; }
-
     public string Value { get; init; } = null!;
 }

src/Web/Messages/Handlers/GetMessages.cs

@@ -11,18 +11,18 @@ public class GetMessages(
     public override void Configure()
     {
         Tags("Messages");
-        Get("/api/messages/{ContentId:guid}");
+        Get("/api/messages/{SubjectId:guid}");
         AllowAnonymous();
     }
 
     public override async Task HandleAsync(
         CancellationToken ct)
     {
-        var contentId = Route<Guid>("ContentId");
+        var subjectId = Route<Guid>("SubjectId");
         
         var comments = await context
             .Messages
-            .Where(c => c.ContentId == contentId)
+            .Where(c => c.SubjectId == subjectId)
             .ToListAsync(cancellationToken: ct);
 
         await SendAsync(comments, cancellation: ct);

src/Web/Messages/Handlers/PostMessage.cs

@@ -5,7 +5,7 @@ using Hutopy.Web.Messages.Data;
 namespace Hutopy.Web.Messages.Handlers;
 
 public record PostMessageRequest(
-    Guid ContentId,
+    Guid SubjectId,
     string Message);
 
 public class PostMessage(
@@ -25,7 +25,7 @@ public class PostMessage(
     {
         await context.Messages.AddAsync(
             new Message { 
-                ContentId = req.ContentId, 
+                SubjectId = req.SubjectId, 
                 CreatedBy = User.GetUserId(),
                 Value = req.Message },
             ct);

src/Web/Messages/Handlers/PostReplyMessage.cs

@@ -5,7 +5,7 @@ using Hutopy.Web.Messages.Data;
 namespace Hutopy.Web.Messages.Handlers;
 
 public record PostReplyMessageRequest(
-    Guid ContentId,
+    Guid SubjectId,
     Guid ParentId,
     string Message);
 
@@ -26,7 +26,7 @@ public sealed class PostReplyMessage(
         await context.Messages.AddAsync(
             new Message
             {
-                ContentId = req.ContentId,
+                SubjectId = req.SubjectId,
                 ParentId = req.ParentId,
                 CreatedBy = User.GetUserId(),
                 Value = req.Message