CREATE TABLE IF NOT EXISTS user_sessions (
  id TEXT PRIMARY KEY,
  user_id TEXT NOT NULL,
  refresh_token_hash TEXT NOT NULL UNIQUE,
  client_type TEXT NOT NULL,
  user_agent TEXT,
  ip TEXT,
  expires_at TEXT NOT NULL,
  revoked_at TEXT,
  created_at TEXT NOT NULL,
  updated_at TEXT NOT NULL,
  last_seen_at TEXT NOT NULL,
  FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
);

CREATE INDEX IF NOT EXISTS user_sessions_user_idx
  ON user_sessions (user_id, expires_at DESC);