MAINT-10: maintenance start hour in local time, default 19:00

The start hour was compared with the UTC hour, so the shipped 10 started at
12:00 in a Belgian summer. It is now read in Home Assistant's time zone
(fallback: the container's TZ, then UTC, one log line says which), and the
default moves to 19. DST: a missing hour starts at the first hour after the
jump; a repeated hour starts only in its first pass. Stored options are not
rewritten: a saved 10 now means 10:00 local (DOCS, CHANGELOG).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

goodwe_controller/app/main.py

@@ -29,6 +29,7 @@ import functools
 import json
 import logging
 import math
+import os
 import signal
 import time
 from datetime import datetime, timedelta, timezone
@@ -64,7 +65,7 @@ from . import messages
 from .freeze import (
     FreezeWatchdog, FreezeWatchdogConfig, looks_frozen, rail_unreachable, rail_w,
 )
-from .hass import HomeAssistant
+from .hass import CORE_API, HomeAssistant
 # ⚠️ `LINK_STALE_S` IS RE-EXPORTED DELIBERATELY. `live_units()` reasons about it
 # and two checks read `app.main.LINK_STALE_S` to build a stale link, so the
 # window an operator would look up here is the one the roster actually uses.
@@ -72,7 +73,7 @@ from .inverter import (LINK_STALE_S, UNIT_A, build_roster,
                        roster_entries, roster_names)
 from .maintenance import (
     DRAIN, IDLE, POWER_MOVING, MaintConfig, Maintenance, MaintResult,
-    arbitrate as maint_arbitrate,
+    arbitrate as maint_arbitrate, site_zone,
 )
 from .mqtt import (MODE_CONFIGS_KEY, MODE_LABELS, USE_OFF, USE_ON,
                    MqttPublisher, announced_units, mode_configs,
@@ -402,7 +403,8 @@ def arbitrage_row(*, on: bool, decision, decided_at, cycle_at, now,
 class Controller:
     def __init__(self, opts: dict, hass: HomeAssistant, store, mqtt_pub, *, stop,
                  peak_db_path: str = "/data/tariff.db",
-                 price_history_path: str = "/data/price_history.json"):
+                 price_history_path: str = "/data/price_history.json",
+                 site_tz=None):
         # UX-15: a read-only HomeAssistant belongs to setup-only mode, which
         # builds no controller. Refused here so no controller can hold one.
         if getattr(hass, "read_only", False) is True:
@@ -643,7 +645,8 @@ class Controller:
                 name=inv.name,
                 # The rollback view, and only ever the first pack's: the flat
                 # keys mean `inverters[0]` on every install that has them.
-                mirror_flat=(not _one_pack and i == 0))
+                mirror_flat=(not _one_pack and i == 0),
+                tz=site_tz)     # MAINT-10: the start hour's zone, from amain()
             for i, inv in enumerate(self.inverters)]
 
         # SAFETY-02. ONE INSTANCE PER ACTUATOR - which is what watchdog.py's own
@@ -6575,6 +6578,37 @@ async def docs_link_facts(session, token: str) -> dict:
     return out
 
 
+async def ha_time_zone(session, token: str) -> tuple:
+    """MAINT-10: `(zone, why)` - Home Assistant's configured time zone, or None
+    and a short reason. Same 3 s budget as the docs link: never holds up start."""
+    try:
+        async with session.get(f"{CORE_API}/config", timeout=DOCS_LINK_TIMEOUT_S,
+                               headers={"Authorization": f"Bearer {token}"}) as r:
+            body = await r.json(content_type=None)
+        zone = body.get("time_zone") if isinstance(body, dict) else None
+        return (zone, "") if zone else (None, "no time_zone in its answer")
+    except Exception as err:  # noqa: BLE001 - a fallback exists, never a stop
+        text = str(err).strip()
+        return None, f"{type(err).__name__}: {text}" if text else type(err).__name__
+
+
+async def maint_site_tz(session, token: str):
+    """MAINT-10: the zone the maintenance start hour is read in, logged once."""
+    zone, why = await ha_time_zone(session, token)
+    tz, name, source, why = site_zone(zone, why, os.environ.get("TZ"))
+    if source == "ha":
+        _LOG.info("Maintenance start hour is local time in %s, from Home "
+                  "Assistant.", name)
+    elif source == "tz":
+        _LOG.info("Maintenance start hour is local time in %s, from the "
+                  "add-on's time zone. Home Assistant gave none: %s.", name, why)
+    else:
+        _LOG.warning("Maintenance start hour uses UTC, because no time zone "
+                     "was found. Set the time zone in Home Assistant.")
+        _LOG.debug("maintenance time zone: %s", why)
+    return tz
+
+
 async def amain() -> None:
     opts = load_options()
     logging.basicConfig(
@@ -6684,7 +6718,8 @@ async def amain() -> None:
             pub = _NoMqtt()
 
         stop = asyncio.Event()
-        controller = Controller(opts, hass, store, pub, stop=stop)
+        controller = Controller(opts, hass, store, pub, stop=stop,
+                                site_tz=await maint_site_tz(session, _tok))
         if callable(getattr(pub, "bind", None)):
             pub.bind(asyncio.get_running_loop(), controller.mqtt_command)
         runner = await web.start(controller, port=INGRESS_PORT)