Add NPC interaction system with memory and quest generation

- Introduced a new NPC system with dynamic NPCs and conversation handling.
- Implemented NPC memory using SQLite to log conversations and manage relationships.
- Added commands for talking to NPCs, listing available NPCs, and generating quests.
- Updated database schema to support NPC conversations and relationships.
- Refactored code structure to separate concerns into cogs and handlers.

utils/sql_commands.py

@@ -203,6 +203,8 @@ class DatabaseManager:
         query = f"{query} ({', '.join(keys)}) VALUES ({placeholders})"
         values = [tuple(data.values()) for data in params]
 
+        connection = None
+        cursor = None
         try:
             connection = self.get_connection()
             cursor = connection.cursor()
@@ -213,10 +215,13 @@ class DatabaseManager:
             )
         except mysql.connector.Error as err:
             logger.error(f"Bulk insert failed: {err}")
-            connection.rollback()  # Roll back on error
+            if connection:
+                connection.rollback()  # Roll back on error
         finally:
-            cursor.close()
-            connection.close()
+            if cursor:
+                cursor.close()
+            if connection:
+                connection.close()
 
     def delete(self, table_name: str, condition: dict) -> None:
         """Deletes a record from the specified table based on the condition provided."""