Manage: Optimize - Decomposition impact

As part of DB Sharding, a portion of GitLab's database will be moved into a second, separate logical database. We need to understand the impacts of this on our area.

1. Review this epic
2. Determine whether the impact is on the critical path of the first iteration. Answer these questions in order to help you come to a conclusion:
   • Do you connect to the database directly?
   • Do you connect to the database via the API?
   • Does your feature require data joins from the two logical databases?
   • Does your ActiveRecord query span tables in the two logical databases?
3. Find a solution as the details become clear