SQLite TIMESTAMP columns store UTC without a zone marker. `Date.parse`
treats timezoneless ISO strings as local time, so on any non-UTC host
every claim and processAfter looks (TZ offset) hours stale. That makes
fresh claims trip the kill-claim path on the first sweep tick — every
container gets killed within seconds of spawn.
Two affected sites in host-sweep.ts:
- decideStuckAction reads claim.status_changed and computes claimAge.
On a TZ=Europe/Madrid host (UTC+2), a claim made 5s ago looks
7205s old and exceeds CLAIM_STUCK_MS (60s).
- The orphan retry loop reads msg.processAfter and skips messages
rescheduled into the future. On the same host, future timestamps
look (TZ offset) hours in the past, so the skip is missed and
tries gets bumped on every tick.
Fix: introduce parseSqliteUtc(s) which appends "Z" only when no zone
marker is present, then call it from both sites. Behavior under
TZ=UTC is unchanged.
Verified on a production v2 install on TZ=Europe/Madrid: with the
patch applied, an idle container survived 30+ minutes without being
killed (previously: killed within 60s of spawn).
Tests: 5 new cases covering the bare/Z/+offset/invalid input matrix
and a TZ-independence check. All 19 host-sweep tests pass and tsc
clears against main.
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