Reconcile Geo project, file and attachment registries against reality on gprd
Currently, the Geo metrics on gprd aren't completely trustworthy. We see number of out of sync repositories go below zero from time to time, for instance.
I suspect this issue is caused by some *_registry
columns being out-of-sync with reality - referring to projects that have been deleted, etc.
To restore confidence in these numbers, we should perform a manual reconciliation process against the registry rows, to ensure they all refer to projects, wikis and files that actually exist. This should prevent us from swinging below zero.