# REPORT — 2026-09-28: claper → PostgreSQL 17; calcom inconclusive

Brief: "golden, Day-0 vouch, kept data from off-site…" Part C. Architecture read: `09-update-architecture.md` §3
decisions 35–42 (42's reasoning applied as decision 43).

| app | move | bench (LXC 9401, demo-hp) | box 9202 (guarded Update) | result |
|---|---|---|---|---|
| claper | postgres 16 → 17 | proven — converted 30.8 s, 32 tables equal, seed back, peaks 75.8 % / 78.3 %, 0 kills | proven — CONVERTED in 7.2 s, done 47 s, PG_VERSION 17, seed back | live catalog `4a249b9`, engine gate ALLOWED |
| calcom | — | not run | FROM v6.2.0 OOM-killed at 768 MB on a fresh install (R-703) | inconclusive |

- Fixture: claper `rpc register_user` + authenticate readback (negative control: wrong password refuses) — `c5015ce`.
- calcom seed route exists (`POST /api/auth/setup`, first user only) but the app never ran long enough to use it.
- New rows: R-702 (claper default admin `admin@claper.co`/`claper`, P1), R-703 (calcom OOM at 768 MB, P2).
- Bench LXC 9401 destroyed (hostname checked), template removed; `local-lvm` 55.59 % at teardown.

Evidence: `felhom.eu/documentation/audits/pg-calcom-claper-2026-09-28/`.