backend/database/migrations/076_ai_prompt_templates_global.sql

-- Make AI prompt templates global; assign to websites via join + pack public id.

CREATE TABLE IF NOT EXISTS domain_ai_prompt_templates (
  domain_id   BIGINT NOT NULL REFERENCES domains (id) ON DELETE CASCADE,
  template_id BIGINT NOT NULL REFERENCES ai_prompt_templates (id) ON DELETE CASCADE,
  sort_order  INT NOT NULL DEFAULT 0,
  created_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
  PRIMARY KEY (domain_id, template_id)
);

CREATE INDEX IF NOT EXISTS idx_domain_ai_prompt_templates_template_id
  ON domain_ai_prompt_templates (template_id);

ALTER TABLE domains
  ADD COLUMN IF NOT EXISTS ai_prompts_public_id VARCHAR(32);

DO $$
BEGIN
  IF NOT EXISTS (
    SELECT 1 FROM pg_constraint WHERE conname = 'domains_ai_prompts_public_id_unique'
  ) THEN
    ALTER TABLE domains
      ADD CONSTRAINT domains_ai_prompts_public_id_unique UNIQUE (ai_prompts_public_id);
  END IF;
END $$;

-- Preserve any existing per-domain template links (from 075).
DO $$
BEGIN
  IF EXISTS (
    SELECT 1
    FROM information_schema.columns
    WHERE table_name = 'ai_prompt_templates' AND column_name = 'domain_id'
  ) THEN
    INSERT INTO domain_ai_prompt_templates (domain_id, template_id, sort_order)
    SELECT domain_id, id, 0
    FROM ai_prompt_templates
    WHERE domain_id IS NOT NULL
    ON CONFLICT DO NOTHING;

    UPDATE domains d
    SET ai_prompts_public_id = t.public_id
    FROM (
      SELECT DISTINCT ON (domain_id) domain_id, public_id
      FROM ai_prompt_templates
      WHERE public_id IS NOT NULL
      ORDER BY domain_id, id
    ) t
    WHERE d.id = t.domain_id
      AND d.ai_prompts_public_id IS NULL;
  END IF;
END $$;

ALTER TABLE ai_prompt_templates DROP COLUMN IF EXISTS domain_id;
ALTER TABLE ai_prompt_templates DROP COLUMN IF EXISTS public_id;