1 files changed, 28 insertions, 0 deletions
diff --git a/db/migrate/20210609013512_add_unique_index_for_batched_background_migrations.rb b/db/migrate/20210609013512_add_unique_index_for_batched_background_migrations.rb
new file mode 100644
index 00000000000..28214aedce6
--- /dev/null
+++ b/db/migrate/20210609013512_add_unique_index_for_batched_background_migrations.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+class AddUniqueIndexForBatchedBackgroundMigrations < ActiveRecord::Migration[6.1]
+  include Gitlab::Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  TABLE_NAME = :batched_background_migrations
+  INDEX_NAME = 'index_batched_background_migrations_on_unique_configuration'
+  REDUNDANT_INDEX_NAME = 'index_batched_migrations_on_job_table_and_column_name'
+
+  def up
+    add_concurrent_index TABLE_NAME,
+      %i[job_class_name table_name column_name job_arguments],
+      unique: true,
+      name: INDEX_NAME
+
+    remove_concurrent_index_by_name TABLE_NAME, REDUNDANT_INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index TABLE_NAME,
+      %i[job_class_name table_name column_name],
+      name: REDUNDANT_INDEX_NAME
+
+    remove_concurrent_index_by_name TABLE_NAME, INDEX_NAME
+  end
+end