Brings a restored roster into service at boot without walking the whole
feed index: feeds newer than the highest restored id are added (one call
per collection when nothing is new), and the cache is marked built so
visits can begin. Counters of restored feeds stay as checkpointed until a
visit or the full walk the host runs in the background afterwards.
Returns Promise<number[]>
The feed IDs added.
Throws
When not connected or the roster is empty (nothing was
restored) — the host then falls back to the full index build.
Brings a restored roster into service at boot without walking the whole feed index: feeds newer than the highest restored id are added (one call per collection when nothing is new), and the cache is marked built so visits can begin. Counters of restored feeds stay as checkpointed until a visit or the full walk the host runs in the background afterwards.