Swap FK ci_triggers to projects for LFK

Swaps FK for ci_triggers.project_id to projects

Changelog: changed

db/post_migrate/20220124151456_remove_projects_ci_triggers_project_id_fk.rb

+# frozen_string_literal: true
+
+class RemoveProjectsCiTriggersProjectIdFk < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  def up
+    return unless foreign_key_exists?(:ci_triggers, :projects, name: "fk_e3e63f966e")
+
+    with_lock_retries do
+      execute('LOCK projects, ci_triggers IN ACCESS EXCLUSIVE MODE') if transaction_open?
+
+      remove_foreign_key_if_exists(:ci_triggers, :projects, name: "fk_e3e63f966e")
+    end
+  end
+
+  def down
+    add_concurrent_foreign_key(:ci_triggers, :projects, name: "fk_e3e63f966e", column: :project_id, target_column: :id, on_delete: :cascade)
+  end
+end

db/schema_migrations/20220124151456

+5ec73b28adb027a4462ec9b268ef9c505e281f1afedce3c592d431cd90808dac
\ No newline at end of file

db/structure.sql

@@ -29906,9 +29906,6 @@ ALTER TABLE ONLY ci_builds_metadata
 ALTER TABLE ONLY gitlab_subscriptions
     ADD CONSTRAINT fk_e2595d00a1 FOREIGN KEY (namespace_id) REFERENCES namespaces(id) ON DELETE CASCADE;
 
-ALTER TABLE ONLY ci_triggers
-    ADD CONSTRAINT fk_e3e63f966e FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;
-
 ALTER TABLE ONLY merge_requests
     ADD CONSTRAINT fk_e719a85f8a FOREIGN KEY (author_id) REFERENCES users(id) ON DELETE SET NULL;
 

lib/gitlab/database/gitlab_loose_foreign_keys.yml

@@ -170,3 +170,6 @@ ci_triggers:
   - table: users
     column: owner_id
     on_delete: async_delete
+  - table: projects
+    column: project_id
+    on_delete: async_delete

spec/lib/gitlab/database/no_cross_db_foreign_keys_spec.rb

@@ -38,7 +38,6 @@ RSpec.describe 'cross-database foreign keys' do
       ci_stages.project_id
       ci_subscriptions_projects.downstream_project_id
       ci_subscriptions_projects.upstream_project_id
-      ci_triggers.project_id
       ci_unit_tests.project_id
       ci_variables.project_id
       dast_site_profiles_pipelines.ci_pipeline_id

spec/models/ci/trigger_spec.rb

@@ -68,4 +68,11 @@ RSpec.describe Ci::Trigger do
       let!(:model) { create(:ci_trigger, owner: parent) }
     end
   end
+
+  context 'loose foreign key on ci_triggers.project_id' do
+    it_behaves_like 'cleanup by a loose foreign key' do
+      let!(:parent) { create(:project) }
+      let!(:model) { create(:ci_trigger, project: parent) }
+    end
+  end
 end