The reports table 500'd on every load: the backup lookup ordered with
ORDER BY lastseenat DESC NULLS LAST, which SQLite accepts and MySQL
rejects outright. Every test passed and the real database refused the
query - the tests run on SQLite, so the dialect difference was invisible.
Sorting in Python removes the dependency for nothing: the rows are one per
host per kind. The regression test pins which revision wins, including
that one never confirmed does not, and says why the sort lives here so it
does not get helpfully moved back into SQL.
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