feat(iot): Sub 7 — per-sensor polling interval + rate-limit + entech seed

Per-sensor override on fp.tank.sensor.poll_interval_minutes with a
company-wide default (res.company.x_fc_default_poll_interval_minutes,
default 30) exposed in Settings → Fusion Plating → IoT. Single
lookup helper _fp_effective_poll_interval_minutes keeps downstream
call sites simple. Read-only poll_interval_display Char ("30 min
(default)" / "15 min (override)") keeps units unambiguous per user
request.

Ingest endpoint /fp/iot/ingest drops readings that arrive inside a
sensor's effective interval, returning {accepted, skipped} so the Pi
agent can log it. Pi-side interval stays its own concern.

Post-init hook seeds 5 small tanks + 20 big tanks (10 active, 10
inactive) with 1 temperature + 1 pH sensor each → 25 tanks, 50
sensors. Idempotent (keyed by tank.code, with_context(active_test=
False)). Opt-in via ir.config_parameter
fusion_plating_iot.seed_entech_tanks = '1' so a fresh install
elsewhere doesn't auto-seed. Flag set on entech today; 27 tanks / 52
sensors now live (2 pilot + 25 seeded).

Smoke on entech: 14/14 assertions pass including idempotency and
rate-limit conditions.

fusion_plating_iot → 19.0.2.0.0

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_iot/fusion_plating_iot/controllers/fp_iot_ingest.py

@@ -31,7 +31,7 @@ Returns 200 + `{ok: true, accepted: N}` on success, 401 on auth fail,
 import hmac
 import json
 import logging
-from datetime import datetime, timezone
+from datetime import datetime, timedelta, timezone
 
 from odoo import http
 from odoo.http import request, Response
@@ -109,6 +109,7 @@ class FpIotIngestController(http.Controller):
         Sensor = request.env['fp.tank.sensor'].sudo()
         Reading = request.env['fp.tank.reading'].sudo()
         accepted = 0
+        skipped_interval = 0
         unknown_serials = []
         for r in readings:
             serial = (r.get('device_serial') or '').strip()
@@ -122,6 +123,23 @@ class FpIotIngestController(http.Controller):
                 value = float(r.get('value'))
             except (TypeError, ValueError):
                 continue
+
+            # Sub 7 — per-sensor rate-limit. Drop readings that arrive
+            # inside the sensor's effective polling interval so the Pi
+            # agent can happily poll every 30 s while the log only
+            # retains a row every 15–30 min. Inactive sensors also
+            # dropped so disabled tanks don't clutter the log.
+            if not sensor.active:
+                skipped_interval += 1
+                continue
+            interval = sensor._fp_effective_poll_interval_minutes()
+            if interval > 0 and sensor.last_reading_at:
+                read_at = _parse_read_at(r.get('read_at'))
+                elapsed = read_at - sensor.last_reading_at
+                if elapsed < timedelta(minutes=interval):
+                    skipped_interval += 1
+                    continue
+
             Reading.create({
                 'sensor_id': sensor.id,
                 'value': value,
@@ -130,10 +148,11 @@ class FpIotIngestController(http.Controller):
             })
             accepted += 1
 
-        status = 200 if accepted else (404 if unknown_serials else 400)
+        status = 200 if (accepted or skipped_interval) else (404 if unknown_serials else 400)
         payload = {
-            'ok': accepted > 0,
+            'ok': (accepted + skipped_interval) > 0,
             'accepted': accepted,
+            'skipped': skipped_interval,
         }
         if unknown_serials:
             payload['unknown_serials'] = unknown_serials