# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""The command history: what was run, by whom, when, and whether it worked.

A sibling of ``stats`` rather than part of it, because the two answer
different questions from different tables. ``stats`` is the *message*
history -- who said how much -- and is what the nightly report reads.
This is the *command* history, and it exists because none of it was kept:
the old record was two aggregates written only when a command succeeded,
so a command that failed every time looked exactly like one nobody ran.
"""