0143f5dd12
- Created DatabaseService.php with full OOP database abstraction layer - Methods: select(), selectOne(), insert(), update(), delete(), execute(), count(), exists() - Transaction support: beginTransaction(), commit(), rollback() - Error handling: getLastError(), getLastQuery() for debugging - Type-safe parameter binding with prepared statements - Updated connection.php to initialize $db service - Available globally as $db variable after connection.php include - Foundation for migrating from procedural $conn queries