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feat: History compaction for spheres and gateways #661
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This change proposes a form of incremental history compaction, the core of which is implemented in
Sphere. Its only use at this time will be in the Noosphere Gateway, where it will be used to ensure that side-effects that cause history to accrue for the gateway's sphere do not result in unbounded version growth. As of this change, the gateway will attempt to compact its history once an hour. The compaction flattens all history since the last user sync point.