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                        Not all ledger secrets should be kept in enclave memory
Follow up from #1648. Now that we have a mechanism to recover historical ledger secrets from the ledger, we shouldn't keep in enclave memory all the historical ledger secrets that we've ever known about as we can conveniently retrieve them from the ledger when necessary.
@jumaffre that seems like something that could make use of the LFS mechanism @eddyashton built for indexing?