Use commit log in database, from Calle:
"Initial" usage of the commitlog in database mutation path.
A commitlog is created in "work" dirs when initing the db
from a datadir. However, since we have neither disk data storage,
nor replay capability yet (and no real db config), the settings
are basically to just write in-memory serialization, write them to
disk and then discard them. So in fact, pointless. But at least using
the log...
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