Includes logic to persist namespace statistics

- Add two new ActiveRecord models:
  - RootNamespaceStoragestatistics will persist root namespace statistics
  - NamespaceAggregationSchedule will save information when a new update
to the namespace statistics needs to be scheduled
- Inject into UpdateProjectStatistics concern a new callback that will
call an async job to insert a new row onto NamespaceAggregationSchedule
table
- When a new row is inserted a new job is scheduled. This job will
update call an specific service to update the statistics and after that
it will delete thee aggregated scheduled row
- The RefresherServices makes heavy use of arel to build composable
queries to update Namespace::RootStorageStatistics attributes.
- Add an extra worker to traverse pending rows on
NAmespace::AggregationSchedule table and schedule a worker for each one
of this rows.
- Add an extra worker to traverse pending rows on
NAmespace::AggregationSchedule table and schedule a worker for each one
of this rows

1 files changed, 4 insertions, 0 deletions

diff --git a/app/models/namespace.rb b/app/models/namespace.rb
index bfa33dc86ac..af50293a179 100644
--- a/app/models/namespace.rb
+++ b/app/models/namespace.rb
@@ -293,6 +293,10 @@ class Namespace < ApplicationRecord
     end
   end
 
+  def aggregation_scheduled?
+    aggregation_schedule.present?
+  end
+
   private
 
   def parent_changed?