1 files changed, 29 insertions, 0 deletions
diff --git a/db/migrate/20210721174441_update_escalation_rule_fk_for_pending_alert_escalations.rb b/db/migrate/20210721174441_update_escalation_rule_fk_for_pending_alert_escalations.rb
new file mode 100644
index 00000000000..cf52a43435f
--- /dev/null
+++ b/db/migrate/20210721174441_update_escalation_rule_fk_for_pending_alert_escalations.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class UpdateEscalationRuleFkForPendingAlertEscalations < ActiveRecord::Migration[6.1]
+  include Gitlab::Database::MigrationHelpers
+  include Gitlab::Database::PartitioningMigrationHelpers
+
+  disable_ddl_transaction!
+
+  OLD_FOREIGN_KEY_CONSTRAINT = 'fk_rails_057c1e3d87'
+
+  # Swap foreign key contrainst from ON DELETE SET NULL to ON DELETE CASCADE
+  def up
+    remove_foreign_key_if_exists :incident_management_pending_alert_escalations, :incident_management_escalation_rules, name: OLD_FOREIGN_KEY_CONSTRAINT
+
+    add_concurrent_partitioned_foreign_key :incident_management_pending_alert_escalations,
+      :incident_management_escalation_rules,
+      column: :rule_id
+  end
+
+  def down
+    remove_foreign_key_if_exists :incident_management_pending_alert_escalations, :incident_management_escalation_rules, column: :rule_id
+
+    add_concurrent_partitioned_foreign_key :incident_management_pending_alert_escalations,
+      :incident_management_escalation_rules,
+      column: :rule_id,
+      on_delete: :nullify,
+      name: OLD_FOREIGN_KEY_CONSTRAINT
+  end
+end