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delivery log: measure the sweep before deciding its fate (audit H3, 0007)

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Migration 0007 (DDL only): delivery_log_days, a row per UTC day, kept a
year, shown nowhere - read off a copy of the database after a month by the
decision rule written in the audit plan.

- reconcile_closed: the sweep adds the rows it actually closed.
- reconcile_contradicted: store.UpdateStatus, in one transaction, counts the
  rows with reason "reconcile" a delivery line now speaks of, writes the
  log's status and clears the reason - so a re-read line counts once.
- tailer_blind_seconds: follow() tracks stretches in which the file is gone
  or reopening fails (logtail.blindness); stored when a stretch ends and
  every minute while it lasts; under 3 s not counted (the rotation's tick
  between rename and create loses nothing).
- queued_over_lifetime: every sweep overwrites the day's level with the rows
  queued past LongestLifetime + MaximalBackoff (a message Postfix still
  works on stays queued until its first retry after the lifetime).
- retentionLoop prunes days older than a year.

Tests: store (sums per day, the level overwritten, under a second nothing,
prune; a contradicted sweep counted once and its reason cleared; count of
queued rows); logtail (the sweep counts what it closed; countStuck records
the level; blindness - a one-tick gap not counted, 75 s stored as 60 + 15
from where the last part ended). Schema tests at user_version 7.

schema-migrations.md: chain head 7 (it still said 5 since 2.4.0), row 7.
CHANGELOG [Unreleased], audit plan line ticked, roadmap 10/61.
Evidence: go vet ./... clean; go test ./internal/store ok, ./internal/logtail
ok but for TestFollowTailsAndRotates (Windows); the server run of the stage
follows before the push.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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mix
2026-10-14 14:20:44 +03:00
co-authored by Claude Opus 5.5
parent 9adb44845c
commit ffefa9d6df
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@@ -42,7 +42,7 @@ in `git log` and [CHANGELOG.md](../CHANGELOG.md).
| from-header-binding | Hold a message's `From:` header against the application that sends it | shipped `2.4.0` | 9/9 | [plans/from-header-binding.md](plans/from-header-binding.md) |
| panel-redesign | Panel redesign (accepted mockups, design contract) | shipped `2.0.0` | 27/27 | [plans/panel-redesign.md](plans/panel-redesign.md) |
| schema-squash | Squash SQLite migrations into a 2.x baseline | built in panel-redesign (stage 1) | — | [plans/panel-redesign.md](plans/panel-redesign.md) |
| audit-2026-10-12 | Follow-ups of the 2026-10-12 full-tree code audit, seven stages | in progress (stage 0 shipped `2.4.2`; next stages 1+2 → `2.5.0`) | 9/61 | [audit-2026-10-12.md](audit-2026-10-12.md) |
| audit-2026-10-12 | Follow-ups of the 2026-10-12 full-tree code audit, seven stages | in progress (stage 0 shipped `2.4.2`; next stages 1+2 → `2.5.0`) | 10/61 | [audit-2026-10-12.md](audit-2026-10-12.md) |
**Recommended order** (not binding; owner, 2026-10-09: feature order follows
development convenience): **panel-redesign** shipped as `2.0.0` (2026-10-11) and