CREATE TABLE IF NOT EXISTS settings (
  key TEXT PRIMARY KEY,
  value TEXT NOT NULL,
  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS oauth_states (
  state TEXT PRIMARY KEY,
  expires_at INTEGER NOT NULL
);

CREATE TABLE IF NOT EXISTS oauth_tokens (
  provider TEXT PRIMARY KEY,
  refresh_token_enc TEXT NOT NULL,
  account_email TEXT NOT NULL,
  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS bookings (
  id TEXT PRIMARY KEY,
  name TEXT NOT NULL,
  email TEXT NOT NULL,
  phone TEXT,
  message TEXT,
  start_time TEXT NOT NULL,
  end_time TEXT NOT NULL,
  duration_minutes INTEGER NOT NULL,
  timezone TEXT NOT NULL,
  meeting_mode TEXT NOT NULL,
  google_event_id TEXT,
  meet_url TEXT,
  status TEXT NOT NULL DEFAULT 'pending',
  created_at TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_bookings_start ON bookings(start_time);
CREATE INDEX IF NOT EXISTS idx_bookings_status ON bookings(status);

CREATE TABLE IF NOT EXISTS slot_locks (
  slot_key TEXT PRIMARY KEY,
  booking_id TEXT NOT NULL,
  expires_at INTEGER NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_slot_locks_expiry ON slot_locks(expires_at);

CREATE TABLE IF NOT EXISTS rate_limits (
  key TEXT PRIMARY KEY,
  count INTEGER NOT NULL DEFAULT 1,
  reset_at INTEGER NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_rate_limits_reset ON rate_limits(reset_at);