Refactor database management and schema initialization

- Removed the old npc_memory.db file.
- Updated time.txt with a new timestamp.
- Refactored transaction recording in bank_functions.py to use parameterized queries.
- Enhanced DatabaseManager in sql_commands.py to support singleton pattern and improved table creation logic.
- Added methods for sanitizing SQL identifiers and parsing insert columns for upsert operations.
- Improved error handling and connection management in execute_query, fetch_one, fetch_all, and fetch_as_dataframe methods.
- Introduced a new bootstrap_database.py script for initializing the database schema.
- Updated app.py to use the new initialize_database function for database management.

utils/bank_functions.py

@@ -40,7 +40,10 @@ async def record_transaction(
         transaction_type: The type of transaction performed.
         amount: The amount of the transaction.
     """
-    db.insert("transactions", (user_id, transaction_type, amount))
+    db.execute_query(
+        "INSERT INTO transactions (USERID, TYPE, AMOUNT) VALUES (%s, %s, %s)",
+        (user_id, transaction_type, amount),
+    )
 
 
 async def update_money(