1 files changed, 31 insertions, 0 deletions
diff --git a/db/migrate/20201022094846_update_historical_data_recorded_at.rb b/db/migrate/20201022094846_update_historical_data_recorded_at.rb
new file mode 100644
index 00000000000..bd1889149bb
--- /dev/null
+++ b/db/migrate/20201022094846_update_historical_data_recorded_at.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class UpdateHistoricalDataRecordedAt < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    update_value = Arel.sql("COALESCE(created_at, date + '12:00'::time AT TIME ZONE '#{Time.zone&.tzinfo&.name || "Etc/UTC"}')")
+
+    update_column_in_batches(:historical_data, :recorded_at, update_value) do |table, query|
+      query.where(table[:recorded_at].eq(nil))
+    end
+
+    add_not_null_constraint :historical_data, :recorded_at
+
+    change_column_null :historical_data, :date, true
+  end
+
+  def down
+    change_column_null :historical_data, :date, false
+
+    remove_not_null_constraint :historical_data, :recorded_at
+
+    update_column_in_batches(:historical_data, :recorded_at, nil) do |table, query|
+      query.where(table[:recorded_at].not_eq(nil))
+    end
+  end
+end