1 files changed, 33 insertions, 0 deletions
diff --git a/db/migrate/20201214184020_add_epic_board_list.rb b/db/migrate/20201214184020_add_epic_board_list.rb
new file mode 100644
index 00000000000..9c4e3280754
--- /dev/null
+++ b/db/migrate/20201214184020_add_epic_board_list.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class AddEpicBoardList < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    unless table_exists?(:boards_epic_lists)
+      with_lock_retries do
+        create_table :boards_epic_lists do |t|
+          t.timestamps_with_timezone
+          t.references :epic_board, index: true, foreign_key: { to_table: :boards_epic_boards, on_delete: :cascade }, null: false
+          t.references :label, index: true, foreign_key: { on_delete: :cascade }
+          t.integer :position
+          t.integer :list_type, default: 1, limit: 2, null: false
+
+          t.index [:epic_board_id, :label_id], unique: true, where: 'list_type = 1', name: 'index_boards_epic_lists_on_epic_board_id_and_label_id'
+        end
+      end
+    end
+
+    add_check_constraint :boards_epic_lists, '(list_type <> 1) OR ("position" IS NOT NULL AND "position" >= 0)', 'boards_epic_lists_position_constraint'
+  end
+
+  def down
+    with_lock_retries do
+      drop_table :boards_epic_lists
+    end
+  end
+end