1 files changed, 27 insertions, 0 deletions
diff --git a/db/migrate/20210826145509_add_function_for_inserting_deleted_records.rb b/db/migrate/20210826145509_add_function_for_inserting_deleted_records.rb
new file mode 100644
index 00000000000..ef688cdfd8c
--- /dev/null
+++ b/db/migrate/20210826145509_add_function_for_inserting_deleted_records.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class AddFunctionForInsertingDeletedRecords < ActiveRecord::Migration[6.1]
+  include Gitlab::Database::MigrationHelpers
+  include Gitlab::Database::MigrationHelpers::LooseForeignKeyHelpers
+
+  def up
+    execute(<<~SQL)
+      CREATE FUNCTION #{DELETED_RECORDS_INSERT_FUNCTION_NAME}()
+      RETURNS TRIGGER AS
+      $$
+      BEGIN
+        INSERT INTO loose_foreign_keys_deleted_records
+        (deleted_table_name, deleted_table_primary_key_value)
+        SELECT TG_TABLE_NAME, old_table.id FROM old_table
+        ON CONFLICT DO NOTHING;
+
+        RETURN NULL;
+      END
+      $$ LANGUAGE PLPGSQL
+    SQL
+  end
+
+  def down
+    drop_function(DELETED_RECORDS_INSERT_FUNCTION_NAME)
+  end
+end