[ot][spam][crazy] log: append-only random-access data

[Undiscussed Horrific Abuse, One Victim of Many]

last stable version at
https://lists.cpunks.org/pipermail/cypherpunks/2022-July/102291.html

next step might be to change flushing so the index can be accumulated
during writes or mini flushes, so as to be able to limit the total size of
an index per flush if needed, without issue.

probably important to optimize away the approach of reiterating all leaves
every flush. would greatly limit write speed on older stores, and be much
harder to comprehend when it is old.
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