diff --git a/src/Infrastructure/BotSharp.Core/Repository/FileRepository/FileRepository.User.cs b/src/Infrastructure/BotSharp.Core/Repository/FileRepository/FileRepository.User.cs
index c8eb28dc..465ae961 100644
--- a/src/Infrastructure/BotSharp.Core/Repository/FileRepository/FileRepository.User.cs
+++ b/src/Infrastructure/BotSharp.Core/Repository/FileRepository/FileRepository.User.cs
@@ -54,6 +54,12 @@ public partial class FileRepository
         File.WriteAllText(path, JsonSerializer.Serialize(user, _options));
     }
 
+    public void UpdateExistUser(string userId, User user)
+    {
+        user.Id = userId;
+        CreateUser(user);
+    }
+
     public void UpdateUserVerified(string userId)
     {
         var user = GetUserById(userId);
diff --git a/src/Plugins/BotSharp.Plugin.KnowledgeBase/data/agents/01acc3e5-0af7-49e6-ad7a-a760bd12dc40/templates/knowledge.generation.liquid b/src/Plugins/BotSharp.Plugin.KnowledgeBase/data/agents/01acc3e5-0af7-49e6-ad7a-a760bd12dc40/templates/knowledge.generation.liquid
index 82afe7e6..49e374a1 100644
--- a/src/Plugins/BotSharp.Plugin.KnowledgeBase/data/agents/01acc3e5-0af7-49e6-ad7a-a760bd12dc40/templates/knowledge.generation.liquid
+++ b/src/Plugins/BotSharp.Plugin.KnowledgeBase/data/agents/01acc3e5-0af7-49e6-ad7a-a760bd12dc40/templates/knowledge.generation.liquid
@@ -1,7 +1,8 @@
-You are a knowledge generator for knowledge base. Extract the answer in "SQL Answer" to answer the User Questions
-Replace alias with the actual table name. Output json array only, formatting as [{"question":"string", "answer":"string/sql statement"}]. 
-Skip the question/answer for tmp table.
-Don't include tmp table in the answer.
+You are a knowledge generator for knowledge base. Extract the answer in "SQL Answer" to answer the User Questions.
+* Replace alias with the actual table name. Output json array only, formatting as [{"question":"string", "answer":""}]. 
+* Skip the question/answer for tmp table.
+* Don't include tmp table in the answer.
+* Include all the explanation comments as additional knowledge.
 
 =====
 User Questions:
diff --git a/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/GetTableDefinitionFn.cs b/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/GetTableDefinitionFn.cs
index dcd70915..8d277b9d 100644
--- a/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/GetTableDefinitionFn.cs
+++ b/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/GetTableDefinitionFn.cs
@@ -43,7 +43,7 @@ public class GetTableDefinitionFn : IFunctionCallback
     {
         var settings = _services.GetRequiredService<SqlDriverSetting>();
         var tableDdls = new List<string>();
-        using var connection = new MySqlConnection(settings.MySqlExecutionConnectionString ?? settings.MySqlConnectionString);
+        using var connection = new MySqlConnection(settings.MySqlMetaConnectionString ?? settings.MySqlConnectionString);
         connection.Open();
 
         foreach (var table in tables)
diff --git a/src/Plugins/BotSharp.Plugin.SqlDriver/Settings/SqlDriverSetting.cs b/src/Plugins/BotSharp.Plugin.SqlDriver/Settings/SqlDriverSetting.cs
index 3a4095a6..c6917894 100644
--- a/src/Plugins/BotSharp.Plugin.SqlDriver/Settings/SqlDriverSetting.cs
+++ b/src/Plugins/BotSharp.Plugin.SqlDriver/Settings/SqlDriverSetting.cs
@@ -6,6 +6,7 @@ public class SqlDriverSetting
     public string MySqlConnectionString { get; set; } = null!;
     public string MySqlExecutionConnectionString { get; set; } = null!;
     public string MySqlTempConnectionString { get; set; } = null!;
+    public string MySqlMetaConnectionString { get; set; } = null!;
     public string SqlServerConnectionString { get; set; } = null!;
     public string SqlServerExecutionConnectionString { get; set; } = null!;
     public string SqlLiteConnectionString { get; set; } = null!;