Change SQLite journal mode from WAL to DELETE in blockchain node database configuration

- Update PRAGMA journal_mode from WAL to DELETE in set_sqlite_pragma
- Addresses filesystem permission issues with WAL mode in containerized environments

apps/blockchain-node/src/aitbc_chain/database.py

@@ -24,7 +24,7 @@ _engine = create_engine(f"sqlite:///{settings.db_path}", echo=False)
 @event.listens_for(_engine, "connect")
 def set_sqlite_pragma(dbapi_connection, connection_record):
     cursor = dbapi_connection.cursor()
-    cursor.execute("PRAGMA journal_mode=WAL")
+    cursor.execute("PRAGMA journal_mode=DELETE")
     cursor.execute("PRAGMA synchronous=NORMAL")
     cursor.execute("PRAGMA cache_size=-64000")
     cursor.execute("PRAGMA temp_store=MEMORY")