sparkyfitness: PostgreSQL 15 -> 18, converted by the box (R-463)

The ONLY image move in this commit. Written by upgrade-test.py --write-ladder from both venues:
- bench LXC 9401 (harness v4): converted 15 -> 18 in 13.3 s, check equal over 94 tables, the seeded
  check-in weight read back, 10-minute memory watch peak 31.3 % (anon), 0 kills, 0 restarts;
- box 9202 (controller 0.283.1, the product's guarded Update, drill catalog): CONVERTED 15 -> 18 in
  9.8 s (2 databases, 94 tables, 261 rows equal), done in 58.5 s, PG_VERSION 18, the weight read
  back through the front door. Undo case on 9202 (after a reinstall at 15): the load failing
  (adminpack) -> undone in 74.9 s, back on 15, the weight read back.
Target 18: SparkyFitness's own upstream compose pairs v0.17.3 with postgres:18.3-alpine at
/var/lib/postgresql (09 decision 42's rule). PGDATA is left as it was (/var/lib/postgresql/data/pgdata),
now a folder inside the moved volume — the definition both venues tested. Only the header comment
changes beside the image and its mount.
Evidence: felhom.eu/documentation/audits/pg-last-six-2026-09-30/

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

templates/sparkyfitness/.felhom.yml

@@ -9,7 +9,7 @@ subdomain: "sparky"
 slug: "sparkyfitness"
 # catalog_since: the date THIS repo last changed this app's pinned images. Any commit that
 # changes an image: line must set this to the same day (see CLAUDE.md).
-catalog_since: "2026-07-18"
+catalog_since: "2026-09-30"
 
 resources:
   mem_request: "400M"
@@ -140,3 +140,9 @@ i18n:
         label: 'Application database password'
       - env_var: BETTER_AUTH_SECRET
         label: 'Session signing key'
+
+# update_ladder — the test record: one tested step per line, oldest first (JSON flow mappings,
+# `09-update-architecture.md` §6.4 part 4). WRITTEN BY scripts/upgrade-test.py, never by hand;
+# gated by scripts/check-test-record.py. An image: move without a proven entry here is refused.
+update_ladder:
+  - {"from": {"sparkyfitness-db": "postgres:15-alpine", "sparkyfitness-server": "codewithcj/sparkyfitness_server:v0.17.3", "sparkyfitness-frontend": "codewithcj/sparkyfitness:v0.17.3"}, "to": {"sparkyfitness-db": "postgres:18-alpine", "sparkyfitness-server": "codewithcj/sparkyfitness_server:v0.17.3", "sparkyfitness-frontend": "codewithcj/sparkyfitness:v0.17.3"}, "digest": {"sparkyfitness-db": "sha256:77f585114c32fbca283dc835b0596f4e52b51b4c6662d7810b2f4084f60a1873", "sparkyfitness-frontend": "sha256:46d90e46bd87312fcbbbb05036d99e4cb1c821e928b0516ee727de4c3c90752b", "sparkyfitness-server": "sha256:6aa7d9832324ea403be144a26398a82afbf04abbb4da89f9d04ba61838516b3f"}, "verdict": "proven", "tested_at": "2026-09-30T10:38:51Z", "harness_version": 4, "evidence": "felhom.eu/documentation/audits/pg-last-six-2026-09-30/bench/apps/sparkyfitness/bench/evidence/MV-sparkyfitness/verdict.json", "box_evidence": "felhom.eu/documentation/audits/pg-last-six-2026-09-30/box/sparkyfitness/box-verdict-sparkyfitness.json", "memory_peak_pct": 31.3, "marks": {"files_may_change": false, "needs_person": null, "memory_tight": false}, "memory_basis": "anon", "memory_cgroup_peak_pct": 35.1, "engine_conversion": {"service": "sparkyfitness-db", "engine": "postgres", "from": 15, "to": 18}}

templates/sparkyfitness/docker-compose.yml

@@ -1,6 +1,6 @@
 # SparkyFitness - Táplálkozás- és edzéskövető
 # Domain: ${SUBDOMAIN}.${DOMAIN}
-# Database: PostgreSQL 15 (dedicated)
+# Database: PostgreSQL 18 (dedicated; its datadir stays at PGDATA=/var/lib/postgresql/data/pgdata inside the volume)
 # RAM: ~400M (mem_limit: 1792M) | Pi-compatible: No
 #
 # Topology: frontend (nginx SPA, :80) proxies /api,/uploads internally to
@@ -17,7 +17,7 @@
 
 services:
   sparkyfitness-db:
-    image: postgres:15-alpine
+    image: postgres:18-alpine
     container_name: sparkyfitness-db
     restart: unless-stopped
     environment:
@@ -27,7 +27,7 @@ services:
       - PGDATA=/var/lib/postgresql/data/pgdata
       - TZ=Europe/Budapest
     volumes:
-      - sparkyfitness_db_data:/var/lib/postgresql/data
+      - sparkyfitness_db_data:/var/lib/postgresql
     networks:
       - sparkyfitness-internal
     deploy: