CREATE TABLE IF NOT EXISTS audio_files (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  original_name TEXT NOT NULL,
  file_name TEXT NOT NULL,
  file_path TEXT NOT NULL UNIQUE,
  file_size INTEGER NOT NULL,
  mime_type TEXT NOT NULL,
  folder TEXT DEFAULT '',
  created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
);