`SetMaxOpenConns(1)` under WAL gives up concurrent reads, and the task
asked whether that costs anything. Measured over a fixed two-second
window, a paced writer against a read loop, three runs per cap:
reads do not queue. Four connections buy 70µs at p50 on a turn that
spends 1.19s in the resident model, and write throughput more than
halves. A 19ms worst case also cannot be the source of the 2.7s router
figure, so that line of enquiry is closed.
What the cap cannot survive is a long-lived transaction. It holds the
only connection, so a second read never completes: two seconds and
`context deadline exceeded`, against 1ms at a cap of four.
`Store.DB` handed out exactly that transaction. It had been there since
the initial commit with no production caller, and its comment described
a loop that never materialised. Its one user was a test helper reading
`delivery_attempts` by raw SQL, which `ListDeliveryAttempts` has covered
since V-390. So the cap stays and the seam goes, and the hazard is gone
by construction rather than by documentation.
`internal/store/conncap_test.go` stays as the standing measurement,
skipped under -short. The comment at the cap and the one in
`internal/ipc/server.go` that leans on it now state the invariant and
cite the numbers.
Measurement: docs/evals/2026-08-07-store-connection-cap.md
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Dropping a sev1-2 care nudge while you're away is right and still happens.
But it was a bare `continue`: no row, no log, so "she dropped it", "the gate
suppressed it" and "the rule never fired" all looked identical afterwards.
Adds a 'dropped' delivery status (migration #12 widens the CHECK constraint;
sqlite can't do that in place, so the table is rebuilt) and records the drop
as one delivery_attempts row plus a log line.
No nudges row for a drop: that table feeds the ignored_rate signal, and a
nudge nobody could see must not count as ignored.
TestVoiceNoSessionFallthroughLeavesOutboxTrail expected exactly one row for
sev1-2 when voice had no session. It now expects the voice failure plus the
drop, which is the point of the change.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CGeSZxh1DCtRxmFVSYVGvJ
Two agents wrote the same three test helpers and names for the same two
bugs. Kept the real assertions from dispatcher_test.go and removed the
skipped placeholders they replace. panicSink stays in durability_test.go
since both files use it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CGeSZxh1DCtRxmFVSYVGvJ
Fallthrough is checked per severity through the outbox trail, so sev3/sev4
reroute and sev1/sev2 still drop. Durability uses a real store on a temp file:
a crash between Begin and Complete becomes unknown, is not resent, is not
dropped, and a late Complete cannot overwrite it. One skipped test marks a real
gap: a panic mid-send leaves a permanent pending row.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CGeSZxh1DCtRxmFVSYVGvJ
claude
kami