diff --git a/DysonNetwork.Sphere/Activity/ActivityService.cs b/DysonNetwork.Sphere/Activity/ActivityService.cs
index e2d1583..43c32b2 100644
--- a/DysonNetwork.Sphere/Activity/ActivityService.cs
+++ b/DysonNetwork.Sphere/Activity/ActivityService.cs
@@ -30,6 +30,7 @@ public class ActivityService(AppDatabase db)
                 .Include(e => e.Tags)
                 .FilterWithVisibility(currentUser, userFriends)
                 .ToListAsync();
+            posts = PostService.TruncatePostContent(posts);
 
             var postsDict = posts.ToDictionary(p => p.Id);
 
diff --git a/DysonNetwork.Sphere/Post/Post.cs b/DysonNetwork.Sphere/Post/Post.cs
index 8ab8b3c..df4e3e5 100644
--- a/DysonNetwork.Sphere/Post/Post.cs
+++ b/DysonNetwork.Sphere/Post/Post.cs
@@ -51,7 +51,7 @@ public class Post : ModelBase
     public Post? ForwardedPost { get; set; }
     public ICollection<CloudFile> Attachments { get; set; } = new List<CloudFile>();
     
-    public NpgsqlTsVector SearchVector { get; set; }
+    [JsonIgnore] public NpgsqlTsVector SearchVector { get; set; }
 
     public Publisher Publisher { get; set; } = null!;
     public ICollection<PostReaction> Reactions { get; set; } = new List<PostReaction>();
@@ -59,7 +59,8 @@ public class Post : ModelBase
     public ICollection<PostCategory> Categories { get; set; } = new List<PostCategory>();
     public ICollection<PostCollection> Collections { get; set; } = new List<PostCollection>();
 
-    public bool Empty => Content == null && Attachments.Count == 0 && ForwardedPostId == null;
+    [JsonIgnore] public bool Empty => Content == null && Attachments.Count == 0 && ForwardedPostId == null;
+    [NotMapped] public bool IsTruncated = false;
 }
 
 public class PostTag : ModelBase
diff --git a/DysonNetwork.Sphere/Post/PostController.cs b/DysonNetwork.Sphere/Post/PostController.cs
index 28e5ff5..411347b 100644
--- a/DysonNetwork.Sphere/Post/PostController.cs
+++ b/DysonNetwork.Sphere/Post/PostController.cs
@@ -38,6 +38,7 @@ public class PostController(AppDatabase db, PostService ps, RelationshipService
             .Skip(offset)
             .Take(take)
             .ToListAsync();
+        posts = PostService.TruncatePostContent(posts);
 
         Response.Headers["X-Total"] = totalCount.ToString();
 
@@ -101,6 +102,7 @@ public class PostController(AppDatabase db, PostService ps, RelationshipService
             .Skip(offset)
             .Take(take)
             .ToListAsync();
+        posts = PostService.TruncatePostContent(posts);
 
         Response.Headers["X-Total"] = totalCount.ToString();
 
diff --git a/DysonNetwork.Sphere/Post/PostService.cs b/DysonNetwork.Sphere/Post/PostService.cs
index 35ebc1b..6160f46 100644
--- a/DysonNetwork.Sphere/Post/PostService.cs
+++ b/DysonNetwork.Sphere/Post/PostService.cs
@@ -1,3 +1,4 @@
+using System.Text.Json;
 using DysonNetwork.Sphere.Activity;
 using DysonNetwork.Sphere.Storage;
 using Microsoft.EntityFrameworkCore;
@@ -7,6 +8,64 @@ namespace DysonNetwork.Sphere.Post;
 
 public class PostService(AppDatabase db, FileService fs, ActivityService act)
 {
+    public static List<Post> TruncatePostContent(List<Post> input)
+    {
+        // This truncate post content is designed for quill delta
+        const int maxLength = 256;
+        foreach (var item in input)
+        {
+            if (item.Content is not { RootElement: var rootElement }) continue;
+
+            if (rootElement.ValueKind != JsonValueKind.Array) continue;
+            var totalLength = 0;
+            var truncatedArrayElements = new List<JsonElement>();
+
+            foreach (var element in rootElement.EnumerateArray())
+            {
+                if (element is { ValueKind: JsonValueKind.Object } &&
+                    element.TryGetProperty("insert", out var insertProperty))
+                {
+                    if (insertProperty is { ValueKind: JsonValueKind.String })
+                    {
+                        var textContent = insertProperty.GetString()!;
+                        if (totalLength + textContent.Length <= maxLength)
+                        {
+                            truncatedArrayElements.Add(element);
+                            totalLength += textContent.Length;
+                        }
+                        else
+                        {
+                            var remainingLength = maxLength - totalLength;
+                            if (remainingLength > 0)
+                            {
+                                using var truncatedElementDocument =
+                                    JsonDocument.Parse(
+                                        $@"{{ ""insert"": ""{textContent.Substring(0, remainingLength)}"" }}"
+                                    );
+                                truncatedArrayElements.Add(truncatedElementDocument.RootElement.Clone());
+                                totalLength = maxLength;
+                            }
+
+                            break;
+                        }
+                    }
+                    else
+                        truncatedArrayElements.Add(element);
+                }
+                else
+                    truncatedArrayElements.Add(element);
+
+                if (totalLength >= maxLength)
+                    break;
+            }
+
+            using var newDocument = JsonDocument.Parse(JsonSerializer.Serialize(truncatedArrayElements));
+            item.Content = newDocument;
+        }
+
+        return input;
+    }
+
     public async Task<Post> PostAsync(
         Account.Account user,
         Post post,
diff --git a/DysonNetwork.Sphere/Realm/Realm.cs b/DysonNetwork.Sphere/Realm/Realm.cs
new file mode 100644
index 0000000..6e8da29
--- /dev/null
+++ b/DysonNetwork.Sphere/Realm/Realm.cs
@@ -0,0 +1,18 @@
+using System.ComponentModel.DataAnnotations;
+using System.Text.Json.Serialization;
+using DysonNetwork.Sphere.Storage;
+
+namespace DysonNetwork.Sphere.Realm;
+
+public class Realm : ModelBase
+{
+    public long Id { get; set; }
+    [MaxLength(1024)] public string Name { get; set; } = string.Empty;
+    [MaxLength(4096)] public string Description { get; set; } = string.Empty;
+
+    public CloudFile? Picture { get; set; }
+    public CloudFile? Background { get; set; }
+
+    public long? AccountId { get; set; }
+    [JsonIgnore] public Account.Account? Account { get; set; }
+}
\ No newline at end of file