R-172's root cause was not tuning — the WAL/busy_timeout pragmas had never been
applied, because the DSN used mattn/go-sqlite3 syntax against modernc.org/sqlite,
which ignores unknown parameters without an error. Recorded that way so nobody
re-reads it as "SQLite was slow".
R-173 NEW: while establishing who copies hub.db for the WAL change, found
pvc/hub-data labelled recurring-job-group.longhorn.io/default: disabled, with
backup-daily and backup-weekly the only recurring jobs and both on the default
group — so the hub database has no volume-level backup, and it holds every box's
break-glass root password plus the escrow custody records. Filed, not fixed:
whether the exclusion is deliberate is an operator question.
The session report is REPORT-r172-hub-wal.md, not REPORT.md, per the
parallel-session rule — REPORT.md belongs to the controller session that ran
immediately before this one.
It also records, plainly, that a 60-concurrent load test I ran OOM-killed the hub
pod three times against a 256Mi limit. Not the WAL change, and not a test I
should have run against a Tier-2 box; the unit tests already proved the property.
