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Rewrite the in-mem storage as a backend for the cassandra storage

There is a lot of duplicated logic between the two; and we can rewrite just the data access bits and share the logic between the two.

(work initially started at !407 (closed) a few months ago, but I rewrote it as a bunch of smaller diffs, attached to this task)

Migrated from T2519 (view on Phabricator)