-- TicketLab initial schema (lab / walking skeleton)
CREATE TABLE IF NOT EXISTS schema_migrations (
  id TEXT PRIMARY KEY NOT NULL,
  applied_at TEXT NOT NULL
);

CREATE TABLE IF NOT EXISTS tickets (
  id TEXT PRIMARY KEY NOT NULL,
  description TEXT NOT NULL,
  status TEXT NOT NULL CHECK (status IN ('PENDING', 'CLASSIFIED', 'FAILED')),
  category TEXT CHECK (
    category IS NULL
    OR category IN ('INCIDENT', 'ACCESS_REQUEST', 'BILLING', 'FEATURE_REQUEST', 'OTHER')
  ),
  confidence REAL CHECK (
    confidence IS NULL OR (confidence >= 0 AND confidence <= 1)
  ),
  failure_reason TEXT CHECK (
    failure_reason IS NULL
    OR failure_reason IN ('AI_TIMEOUT', 'AI_UNAVAILABLE', 'AI_INVALID_RESPONSE')
  ),
  created_at TEXT NOT NULL,
  updated_at TEXT NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_tickets_status ON tickets (status);
CREATE INDEX IF NOT EXISTS idx_tickets_created_at ON tickets (created_at);