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.

web/app.py

@@ -4,10 +4,10 @@ import os
 if __package__ is None or __package__ == "":
     # Running as __main__ (e.g. python web/app.py)
     sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
-    from utils.sql_commands import DatabaseManager
+    from utils.sql_commands import DatabaseManager, initialize_database
 else:
     # Imported as a module (e.g. from bot.py)
-    from utils.sql_commands import DatabaseManager
+    from utils.sql_commands import DatabaseManager, initialize_database
 
 import os
 import requests
@@ -21,7 +21,7 @@ load_dotenv()
 
 app = Flask(__name__)
 app.secret_key = os.getenv("SECRET_KEY")
-db = DatabaseManager()
+db = initialize_database()
 
 # Ensure required environment variables are loaded
 DISCORD_CLIENT_ID = os.getenv("DISCORD_CLIENT_ID")