Presence watcher: cost-aware pacing (Fleet API je placené)

- list poll 5→10 min; vehicle_data JEN při přechodu asleep→online nebo
  max 1×/15 min (data /usr/bin/zsh.002/req); wake nikdy (gate na online)
- otevřená ev_session = auto u wallboxu → ŽÁDNÉ API cally (při AC nabíjení
  auto nespí — bez gatu by data tekla celou noc nabíjení)
Odhad: </měsíc (online okna mimo wallbox jsou krátká).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/services/telemetry_collector.py

@@ -499,12 +499,19 @@ async def poll_loxone_sensors(site_id: int, db: asyncpg.Connection) -> None:
             )
 
 
-#: presence poll pacing (sekundy) a geofence poloměr (m)
+#: presence poll pacing (sekundy) a geofence poloměr (m).
-EV_PRESENCE_POLL_S = 300
+#: Fleet API je placené (vehicle_data $0.002/req, wake $0.02 — wake NIKDY):
+#: list 10 min; vehicle_data jen při přechodu asleep→online a pak max 1×/15 min;
+#: při otevřené ev_session se nepolluje vůbec (auto je u wallboxu = doma,
+#: a při AC nabíjení nespí — bez gatu by data cally tekly celou noc).
+EV_PRESENCE_POLL_S = 600
+EV_PRESENCE_DATA_MIN_S = 900
 EV_PRESENCE_HOME_RADIUS_M = 150
 #: anti-spam "píchni auto": min. rozestup notifikací per vozidlo (s)
 EV_PLUG_NUDGE_COOLDOWN_S = 2 * 3600
 _EV_PRESENCE_LAST_POLL: dict[int, float] = {}
+_EV_PRESENCE_LAST_DATA: dict[int, float] = {}
+_EV_PRESENCE_LAST_STATE: dict[int, str] = {}
 _EV_PLUG_NUDGE_LAST: dict[int, float] = {}
 
 
@@ -542,6 +549,19 @@ async def poll_tesla_presence(site_id: int, db: asyncpg.Connection) -> None:
     if veh is None or veh["latitude"] is None:
         return
 
+    # auto na wallboxu (otevřená session) = doma; žádné API cally (šetří $)
+    plugged = await db.fetchval(
+        """
+        select exists(
+          select 1 from ems.ev_session es
+          where es.vehicle_id = $1 and es.session_end is null
+        )
+        """,
+        int(veh["id"]),
+    )
+    if plugged:
+        return
+
     from services.tesla_client import get_charge_state, get_vehicle_api_state, haversine_m
 
     try:
@@ -552,11 +572,20 @@ async def poll_tesla_presence(site_id: int, db: asyncpg.Connection) -> None:
     if api_state is None:
         return
 
+    prev_state = _EV_PRESENCE_LAST_STATE.get(int(veh["id"]))
+    _EV_PRESENCE_LAST_STATE[int(veh["id"])] = api_state
+    woke_up = api_state == "online" and prev_state != "online"
+    data_due = (
+        loop_now - _EV_PRESENCE_LAST_DATA.get(int(veh["id"]), 0.0)
+        >= EV_PRESENCE_DATA_MIN_S
+    )
+
     at_home = None
     distance_m = None
     charging_state = None
     shift_state = None
-    if api_state == "online":
+    if api_state == "online" and (woke_up or data_due):
+        _EV_PRESENCE_LAST_DATA[int(veh["id"])] = loop_now
         try:
             st = await get_charge_state(db, veh["vin"])
         except Exception as e: