-- SMS template verification workflow: free | pending | verified

ALTER TABLE sms_templates
  ADD COLUMN IF NOT EXISTS verification_status VARCHAR(32) NOT NULL DEFAULT 'free';

UPDATE sms_templates
SET verification_status = 'verified'
WHERE is_verified = TRUE;

ALTER TABLE sms_templates
  DROP CONSTRAINT IF EXISTS sms_templates_verification_status_check;

ALTER TABLE sms_templates
  ADD CONSTRAINT sms_templates_verification_status_check
  CHECK (verification_status IN ('free', 'pending', 'verified'));

CREATE INDEX IF NOT EXISTS idx_sms_templates_verification_status
  ON sms_templates (verification_status);

CREATE INDEX IF NOT EXISTS idx_sms_templates_business_status
  ON sms_templates (business_id, verification_status);