Drop FK from clusters_applications_runners

db/post_migrate/20211201101541_drop_clusters_applications_runners_ci_runners_fk.rb

+# frozen_string_literal: true
+
+class DropClustersApplicationsRunnersCiRunnersFk < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      remove_foreign_key_if_exists(:clusters_applications_runners, :ci_runners, name: 'fk_02de2ded36')
+    end
+  end
+
+  def down
+    add_concurrent_foreign_key(:clusters_applications_runners, :ci_runners, name: 'fk_02de2ded36', column: :runner_id, target_column: :id, on_delete: 'set null')
+  end
+end

db/schema_migrations/20211201101541

+277cfcd1002e32c6cd664d6c0b6a7cbdf2ed7e5242e46dbddc4f99b0e8422361
\ No newline at end of file

db/structure.sql

@@ -28808,9 +28808,6 @@ ALTER TABLE ONLY deployments
 ALTER TABLE ONLY epics
     ADD CONSTRAINT fk_013c9f36ca FOREIGN KEY (due_date_sourcing_epic_id) REFERENCES epics(id) ON DELETE SET NULL;
 
-ALTER TABLE ONLY clusters_applications_runners
-    ADD CONSTRAINT fk_02de2ded36 FOREIGN KEY (runner_id) REFERENCES ci_runners(id) ON DELETE SET NULL;
-
 ALTER TABLE ONLY incident_management_escalation_rules
     ADD CONSTRAINT fk_0314ee86eb FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;