# POS-Automation — Decisions

Format: `YYYY-MM-DD: <decision> — <why>`

- **2026-06-07: On-demand trigger via MQTT bridge (lgtv pattern), not cron.** Seth
  wants a Google Home button, not a scheduled print. Bridge `pos-briefing-mqtt.service`
  (systemd, `User=claude`) on steel141 subscribes to `posbriefing/button/press` on
  broker CT 301 (192.168.0.154); HA exposes a `script` to Google as a Scene (button).
  The earlier "schedule 4:58am/3pm" was never a real cron job — that commit only
  edited SESSION.md.
- **2026-06-07: Printer discovered by MAC `50:57:9c:eb:0f:07`, not a fixed IP.** The
  TM-m30's IP changes on every reboot (router DHCP, no reservation). Cache last IP
  (`~/.cache/pos-briefing/last_ip`), verify by MAC + port, sweep the /24 on a miss.
  A router DHCP reservation would make this belt-and-suspenders but isn't required.
- **2026-06-07: Summaries on `gemma4:26b`; story selection stays on a fast model.**
  Seth asked to switch summaries to gemma4. gemma4:26b under `format:json` ignores
  the bare-array instruction and emits a reasoning object (`{"thought": ...}`), which
  broke Phase-1 selection. Selection now uses `ollama_select_model` (default
  `qwen2.5:1.5b`); summaries use `ollama_model` = `gemma4:26b`. Also better latency
  for an interactive button.
- **2026-06-07: yfinance installed on steel141** via `pip --user --break-system-packages`
  (PEP 668). It was missing after the CT 166 → steel141 migration — the original
  "not firing" had two causes: no cron ever installed + this missing dependency.
- **2026-06-07: HA side deployed on VM HA `192.168.0.146`** (`/config/scripts.yaml`
  + `script.print_daily_briefing` in `configuration.yaml` `google_assistant.entity_config`;
  backups in `/config/.backup/`). MQTT-discovery button entity id is
  `button.pos_briefing_print_daily_briefing` (HA prefixes the device name). Access:
  `ssh seth@192.168.0.146` (key auth), `bash -lc "ha core check|restart"`, services via
  `$SUPERVISOR_TOKEN` → `http://supervisor/core/api/`. See `docs/ha-setup.md`.
- **2026-06-07: paho-mqtt v1 callbacks (`CallbackAPIVersion.VERSION1`).** paho 2.1.0
  is installed for `claude`; matches the working lgtv bridge. One-time deprecation
  warning at startup is harmless.

## Deferred / Rejected
- **Print latency (~1–2 min/press):** gemma4:26b summarization (+ yfinance) dominates.
  Acceptable for v1; the button returns immediately and `posbriefing/status` tracks
  progress. Optimize later (model keep-alive, fewer/shorter summaries) if it annoys.
- **Router DHCP reservation for the printer:** Seth's router action; MAC discovery
  makes it optional. Add if convenient to drop the sweep fallback.
- **zfs/reddit/grafana dashboard fields return None on steel141** (not the tank/ZFS
  host; `cannot open 'tank'`). Out of scope for the trigger work — track separately.