* Implement locks in the file cache
* Replace custom locks
* implement restore lock
Used when re-hydrating
* remove legacy use statements
* Add class descriptions
* Fix style
* Default to database cache driver
* missed cache_locks table
prevent chicken-egg issue
* style fixes
* Remove custom file lock implementation
* missed items from file cache
* Update schema definition
hmm, other schema noise must be from manual modification as this is generated from a freshly migrated db.
* require predis, it is pure python, so no harm in adding
* and set predis as the default client
1e4702fa4f