diff --git a/DysonNetwork.Sphere/Account/AccountController.cs b/DysonNetwork.Sphere/Account/AccountController.cs
index 13eb9e8..0fbb2ff 100644
--- a/DysonNetwork.Sphere/Account/AccountController.cs
+++ b/DysonNetwork.Sphere/Account/AccountController.cs
@@ -63,7 +63,7 @@ public class AccountController(
         [MaxLength(128)]
         public string Password { get; set; } = string.Empty;
 
-        [MaxLength(128)] [RegularExpression("^[a-z]{2,3}$")] public string Language { get; set; } = "en-us";
+        [MaxLength(128)] public string Language { get; set; } = "en-us";
 
         [Required] public string CaptchaToken { get; set; } = string.Empty;
     }
@@ -140,7 +140,7 @@ public class AccountController(
     public class BasicInfoRequest
     {
         [MaxLength(256)] public string? Nick { get; set; }
-        [MaxLength(32)] [RegularExpression("^[a-z]{2,3}$")] public string? Language { get; set; }
+        [MaxLength(32)] public string? Language { get; set; }
     }
 
     [Authorize]
diff --git a/DysonNetwork.Sphere/Chat/ChatController.cs b/DysonNetwork.Sphere/Chat/ChatController.cs
index d411962..ba654f6 100644
--- a/DysonNetwork.Sphere/Chat/ChatController.cs
+++ b/DysonNetwork.Sphere/Chat/ChatController.cs
@@ -51,7 +51,6 @@ public partial class ChatController(AppDatabase db, ChatService cs) : Controller
             );
             
         return Ok(result);
-        
     }
         
     public class SendMessageRequest
diff --git a/DysonNetwork.Sphere/Storage/Handlers/MessageReadReceiptFlushHandler.cs b/DysonNetwork.Sphere/Storage/Handlers/MessageReadReceiptFlushHandler.cs
index 654ae87..f5011b9 100644
--- a/DysonNetwork.Sphere/Storage/Handlers/MessageReadReceiptFlushHandler.cs
+++ b/DysonNetwork.Sphere/Storage/Handlers/MessageReadReceiptFlushHandler.cs
@@ -21,7 +21,8 @@ public class MessageReadReceiptFlushHandler(IServiceProvider serviceProvider) :
             .ToList();
 
         using var scope = serviceProvider.CreateScope();
-        var db = scope.ServiceProvider.GetRequiredService<AppDatabase>(); await db.BulkInsertAsync(distinctItems);
+        var db = scope.ServiceProvider.GetRequiredService<AppDatabase>();
+        await db.BulkInsertAsync(distinctItems, config => config.ConflictOption = ConflictOption.Ignore);
     }
 }