Package-level declarations

StandardVersionsRepoProxy implementation backed by a KeyValueRepo mapping table names to version numbers. Stores and retrieves per-table version integers using keyValueStore with table names as keys.

Standard implementation of VersionsRepo that delegates version storage to a StandardVersionsRepoProxy. On setTableVersion: calls StandardVersionsRepoProxy.database.onCreate if the table has no version yet, then iterates onUpdate for each version step until the target version is reached.

Proxy interface providing low-level access to a versioned database T. Implementations store and retrieve per-table version numbers using a backing storage.

This interface has been created due to requirement to work with different versions of databases and make some migrations between versions