feat: add migration to add cascade set null to referenceId on subscription

packages/db/migrations/20250910202358_AddCascadeSetNullToReferenceIdOnSubsriptions.sql

@@ -0,0 +1,7 @@
+ALTER TABLE "subscription" DROP CONSTRAINT "subscription_referenceId_workspace_publicId_fk";
+--> statement-breakpoint
+DO $$ BEGIN
+ ALTER TABLE "subscription" ADD CONSTRAINT "subscription_referenceId_workspace_publicId_fk" FOREIGN KEY ("referenceId") REFERENCES "public"."workspace"("publicId") ON DELETE set null ON UPDATE no action;
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;