klz-cables.com/src/migrations/20260225_003500_add_pages_collection.ts

import { MigrateUpArgs, MigrateDownArgs, sql } from '@payloadcms/db-postgres';

export async function up({ db }: MigrateUpArgs): Promise<void> {
  await db.execute(sql`
    DO $$ BEGIN
      CREATE TYPE "public"."enum_pages_locale" AS ENUM('en', 'de');
    EXCEPTION
      WHEN duplicate_object THEN null;
    END $$;

    CREATE TABLE IF NOT EXISTS "pages" (
      "id" serial PRIMARY KEY NOT NULL,
      "title" varchar NOT NULL,
      "slug" varchar NOT NULL,
      "locale" "enum_pages_locale" NOT NULL,
      "excerpt" varchar,
      "featured_image_id" integer,
      "content" jsonb NOT NULL,
      "updated_at" timestamp(3) with time zone DEFAULT now() NOT NULL,
      "created_at" timestamp(3) with time zone DEFAULT now() NOT NULL
    );

    ALTER TABLE "pages" ADD CONSTRAINT "pages_featured_image_id_media_id_fk"
      FOREIGN KEY ("featured_image_id") REFERENCES "public"."media"("id")
      ON DELETE set null ON UPDATE no action;

    CREATE INDEX IF NOT EXISTS "pages_featured_image_idx" ON "pages" USING btree ("featured_image_id");
    CREATE INDEX IF NOT EXISTS "pages_updated_at_idx" ON "pages" USING btree ("updated_at");
    CREATE INDEX IF NOT EXISTS "pages_created_at_idx" ON "pages" USING btree ("created_at");

    -- Add pages_id to payload_locked_documents_rels if not already present
    ALTER TABLE "payload_locked_documents_rels" ADD COLUMN IF NOT EXISTS "pages_id" integer;
    ALTER TABLE "payload_locked_documents_rels" ADD CONSTRAINT "payload_locked_documents_rels_pages_fk"
      FOREIGN KEY ("pages_id") REFERENCES "public"."pages"("id")
      ON DELETE cascade ON UPDATE no action;
    CREATE INDEX IF NOT EXISTS "payload_locked_documents_rels_pages_id_idx"
      ON "payload_locked_documents_rels" USING btree ("pages_id");
  `);
}

export async function down({ db }: MigrateDownArgs): Promise<void> {
  await db.execute(sql`
    ALTER TABLE "payload_locked_documents_rels" DROP CONSTRAINT IF EXISTS "payload_locked_documents_rels_pages_fk";
    ALTER TABLE "payload_locked_documents_rels" DROP COLUMN IF EXISTS "pages_id";
    DROP TABLE IF EXISTS "pages" CASCADE;
    DROP TYPE IF EXISTS "public"."enum_pages_locale";
  `);
}