felhom.eu/documentation/audits/i18n-slice3-2026-09-18/A

Slice 3 Part A — hub v0.118.0 / v0.118.1, live evidence (2026-09-18)

Method: endpoint-level, plus one real e-mail read in the operator's own inbox. No browser on DooPlex. Nothing was installed, nothing removed; the deploy endpoint was never touched.

1. The wire already worked — measured BEFORE writing any code

Read-only copy of the live hub.db (+ -wal, or it is hours stale):

demo-felhom  14:12 UTC  language='hu'   controller 0.255.0
demo-hp      14:09 UTC  language='en'   controller 0.255.0
drill-r50 / peti-felhom / tester-1      language=<ABSENT>  (0.213.0 / 0.115.0 / 0.245.0)

The positive and the negative control in one read: every box on ≥ 0.247.0 publishes the field, every older one sends nothing at all — which is the case the empty default exists for.

2. The migration applied

reports.language          present: True
customer_configs.language present: True
customer_configs.language = 'hu' for all five customers (the default backfill)

The first reports written by the NEW hub, minutes after the sync, carry the denormalised value:

demo-felhom  id=25717  14:22:59  language='hu'
demo-hp      id=25718  14:23:00  language='en'

Rollback, written before the sync: revert the manifest tag to 0.117.0 and sync. The two columns stay and need no undo — v0.117.0 neither reads nor writes them and both carry a DEFAULT, so every INSERT the old binary performs still succeeds. Rolling back the image is the whole rollback.

3. One real e-mail, both directions, 74 seconds apart

The path is the product's own: sign in to the box, press Send test notification on the notifications page (POST /settings/notifications/test) — which is what a customer's own click does. The box POSTs event_type=test to the hub, and the hub composes the mail.

Box reporting en — 14:30:43 UTC, to the household address drill@felhom.eu:

Subject: [Felhom] Test notification
         Dear Customer,
         This is a test notification from the Felhom monitoring system.
         Notifications are working correctly.
         Best regards,
         Felhom.eu monitoring

The same button, box switched to hu — 14:31:57 UTC, same address:

Subject: [Felhom] Teszt értesítés
         Kedves Ügyfél! Ez egy teszt értesítés a Felhom monitoring rendszerből.
         Az értesítések megfelelően működnek. Üdvözlettel, Felhom.eu monitoring

The Hungarian is byte-for-byte the literal that shipped in v0.117.0 — it was extracted into the bundle by script, never retyped.

The operator's copy is identical in both, to admin@felhom.eu: [Felhom] ✅ demo-hp: teszt / operator channel OK. That is the half worth stating: the household's language changed twice and nothing the operator reads moved.

4. What this did NOT prove

• message_customer has no live proof yet. No box sends it until controller v0.256.0 (Part B). The hub half is covered by tests only.
• The test mail bypasses FormatCustomerEmail, so this proof exercises the bundle and the language resolution, not the event-mail wrapper. The wrapper's live proof waits for Part B.
• Nobody looked at these mails in a mail CLIENT. They are plain text; the bytes above are what was sent.

5. A lapse, recorded

Earlier in this same session (slice 2 releases B/C/D) I left five probe scripts in the guest's /tmp — probeB.sh, probeB2.sh, probeB3.sh, probeC.sh, probeD.sh — and they carried the controller password inline. The standing rule says a credential-bearing helper is deleted from /tmp on both host and guest when done; they sat there for hours instead. Found while cleaning up after this proof, by grepping my own litter for secret-shaped strings before deleting it. All are now shredded, along with this run's password file on the host, the guest and DooPlex. This run used a file→file password (never an inline literal), which is why its own scripts were clean.

6. State at the end

Hub 0.118.1, Synced/Healthy, clean startup log. demo-hp back on Hungarian. Nothing installed, nothing removed, no floor change, no golden. Guest /tmp clean.