ALTER TABLE "documents" ADD COLUMN IF NOT EXISTS "locked_at" timestamp with time zone;--> statement-breakpoint
ALTER TABLE "documents" ADD COLUMN IF NOT EXISTS "locked_by_agent_id" uuid;--> statement-breakpoint
ALTER TABLE "documents" ADD COLUMN IF NOT EXISTS "locked_by_user_id" text;--> statement-breakpoint
DO $$ BEGIN
	IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'documents_locked_by_agent_id_agents_id_fk') THEN
		ALTER TABLE "documents" ADD CONSTRAINT "documents_locked_by_agent_id_agents_id_fk" FOREIGN KEY ("locked_by_agent_id") REFERENCES "public"."agents"("id") ON DELETE set null ON UPDATE no action;
	END IF;
END $$;