-- Registration email verification via 6-digit OTP (replaces magic-link issuance on register).
-- Apply after 013_email_verification.sql:
--   docker exec -i initiative-postgres psql -U initiative -d initiatives < be0/migrations/014_registration_otp.sql

CREATE TABLE IF NOT EXISTS registration_otp_codes (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  otp_hash TEXT NOT NULL,
  expires_at TIMESTAMPTZ NOT NULL,
  failed_attempts INT NOT NULL DEFAULT 0,
  used_at TIMESTAMPTZ,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_registration_otp_codes_user_pending
  ON registration_otp_codes (user_id)
  WHERE used_at IS NULL;

COMMENT ON TABLE registration_otp_codes IS
  'Hashed 6-digit OTP for register verification; pending rows deleted when superseded by resend.';