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Simple rolling bounce upgrade is sufficient. For PAPI uses, nothing changes at all. For DSL users, the internal TimestampedRocksDBStoreRocksDBTimestampedStore (as one example) will upgrade the store data lazily in the background. Only if users provide a custom XxxByteStoreSupplier no upgrade happens (but users can opt-in implementing RecordConverter interface) but the old format is kept. We use a proxy store that removes/adds timestamp on read/write.

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