Removes FK for ci_pipeline_schedules to users

Changelog: changed

db/post_migrate/20220113040447_remove_users_ci_pipeline_schedules_owner_id_fk.rb

+# frozen_string_literal: true
+
+class RemoveUsersCiPipelineSchedulesOwnerIdFk < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      remove_foreign_key_if_exists(:ci_pipeline_schedules, :users, name: "fk_9ea99f58d2")
+    end
+  end
+
+  def down
+    add_concurrent_foreign_key(:ci_pipeline_schedules, :users, name: "fk_9ea99f58d2", column: :owner_id, target_column: :id, on_delete: :nullify)
+  end
+end

db/schema_migrations/20220113040447

+983e5522b2798ca0d17ca3fd848f527b12afdbdd1482a2d420c4c6ce4fa2c9c4
\ No newline at end of file

db/structure.sql

@@ -29522,9 +29522,6 @@ ALTER TABLE ONLY protected_environments
 ALTER TABLE ONLY alert_management_alerts
     ADD CONSTRAINT fk_9e49e5c2b7 FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;
 
-ALTER TABLE ONLY ci_pipeline_schedules
-    ADD CONSTRAINT fk_9ea99f58d2 FOREIGN KEY (owner_id) REFERENCES users(id) ON DELETE SET NULL;
-
 ALTER TABLE ONLY protected_branch_push_access_levels
     ADD CONSTRAINT fk_9ffc86a3d9 FOREIGN KEY (protected_branch_id) REFERENCES protected_branches(id) ON DELETE CASCADE;
 

lib/gitlab/database/gitlab_loose_foreign_keys.yml

+---
 dast_site_profiles_pipelines:
   - table: ci_pipelines
     column: ci_pipeline_id

spec/models/ci/pipeline_schedule_spec.rb

@@ -23,6 +23,11 @@ RSpec.describe Ci::PipelineSchedule do
     subject { build(:ci_pipeline_schedule, project: project) }
   end
 
+  it_behaves_like 'cleanup by a loose foreign key' do
+    let!(:parent) { create(:user) }
+    let!(:model) { create(:ci_pipeline_schedule, owner: parent) }
+  end
+
   describe 'validations' do
     it 'does not allow invalid cron patterns' do
       pipeline_schedule = build(:ci_pipeline_schedule, cron: '0 0 0 * *')