Changed database provider to Postgres since it handle UUID/GUID correctly

src/Web/Messages/Handlers/PostMessage.cs

@@ -23,10 +23,13 @@ public class PostMessage(
         CancellationToken ct)
     {
         await context.Messages.AddAsync(
-            new Message { 
-                SubjectId = req.SubjectId, 
-                CreatedBy = User.GetUserId(),
-                Value = req.Message },
+            new Message
+            {
+                Id = GuidHelper.GenerateUuidV7(),
+                SubjectId = req.SubjectId,
+                CreatedBy = User.GetUserId(), 
+                Value = req.Message
+            },
             ct);
 
         await context.SaveChangesAsync(ct);