1 files changed, 26 insertions, 0 deletions
diff --git a/db/post_migrate/20191104142124_nullify_users_role.rb b/db/post_migrate/20191104142124_nullify_users_role.rb
new file mode 100644
index 00000000000..540d58e95ba
--- /dev/null
+++ b/db/post_migrate/20191104142124_nullify_users_role.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class NullifyUsersRole < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  disable_ddl_transaction!
+  INDEX_NAME = 'partial_index_users_updated_at_for_cleaning_mistaken_values'.freeze
+
+  DOWNTIME = false
+
+  def up
+    # expected updated users count is around 10K
+    # rubocop: disable Migration/UpdateLargeTable
+    add_concurrent_index(:users, :updated_at, where: 'role = 0', name: INDEX_NAME)
+
+    update_column_in_batches(:users, :role, nil) do |table, query|
+      query.where(table[:updated_at].lt('2019-11-05 12:08:00')).where(table[:role].eq(0))
+    end
+
+    remove_concurrent_index_by_name(:users, INDEX_NAME)
+  end
+
+  def down
+    # noop
+  end
+end