Swap FK vulnerability_feedback to ci_pipelines for LFK

Swaps FK for vulnerability_feedback.pipeline_id to ci_pipelines

Changelog: changed

db/post_migrate/20220125084348_remove_ci_pipelines_vulnerability_feedback_pipeline_id_fk.rb

+# frozen_string_literal: true
+
+class RemoveCiPipelinesVulnerabilityFeedbackPipelineIdFk < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  def up
+    return unless foreign_key_exists?(:vulnerability_feedback, :ci_pipelines, name: "fk_rails_20976e6fd9")
+
+    with_lock_retries do
+      execute('LOCK ci_pipelines, vulnerability_feedback IN ACCESS EXCLUSIVE MODE') if transaction_open?
+
+      remove_foreign_key_if_exists(:vulnerability_feedback, :ci_pipelines, name: "fk_rails_20976e6fd9")
+    end
+  end
+
+  def down
+    add_concurrent_foreign_key(:vulnerability_feedback, :ci_pipelines, name: "fk_rails_20976e6fd9", column: :pipeline_id, target_column: :id, on_delete: :nullify)
+  end
+end

db/schema_migrations/20220125084348

+75eb050fc789eb5775a5d3a88c2573dca5c38e16b63cd342bf46dca55d1adaef
\ No newline at end of file

db/structure.sql

@@ -30197,9 +30197,6 @@ ALTER TABLE ONLY boards_epic_lists
 ALTER TABLE ONLY approval_merge_request_rules_groups
     ADD CONSTRAINT fk_rails_2020a7124a FOREIGN KEY (group_id) REFERENCES namespaces(id) ON DELETE CASCADE;
 
-ALTER TABLE ONLY vulnerability_feedback
-    ADD CONSTRAINT fk_rails_20976e6fd9 FOREIGN KEY (pipeline_id) REFERENCES ci_pipelines(id) ON DELETE SET NULL;
-
 ALTER TABLE ONLY work_item_types
     ADD CONSTRAINT fk_rails_20f694a960 FOREIGN KEY (namespace_id) REFERENCES namespaces(id) ON DELETE CASCADE;
 

ee/spec/models/vulnerabilities/feedback_spec.rb

@@ -351,4 +351,11 @@ RSpec.describe Vulnerabilities::Feedback do
       it { is_expected.to eq(finding) }
     end
   end
+
+  context 'loose foreign key on vulnerability_feedback.pipeline_id' do
+    it_behaves_like 'cleanup by a loose foreign key' do
+      let!(:parent) { create(:ci_pipeline) }
+      let!(:model) { create(:vulnerability_feedback, project: parent.project, pipeline: parent) }
+    end
+  end
 end

spec/lib/gitlab/database/no_cross_db_foreign_keys_spec.rb

@@ -32,7 +32,6 @@ RSpec.describe 'cross-database foreign keys' do
       ci_sources_projects.source_project_id
       ci_stages.project_id
       ci_unit_tests.project_id
-      vulnerability_feedback.pipeline_id
     ).freeze
   end