Dashboard: TUV křivka napojená na skutečnou telemetrii TČ

tuv_actual_c byl od vzniku grafu placeholder (null), TUV chart nikdy
neukazoval data. Nové view vw_telemetry_heat_pump_15m_7d (15min agregace,
R__101 + grant R__072) a plnění slotů v useDashboardData. Teploty avg přes
přítomné řádky (idle-skip ok — není to výkon).

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

db/views/R__072_z_postgrest_ems_anon_grants.sql

@@ -17,6 +17,7 @@ END $$;
 GRANT USAGE ON SCHEMA ems TO ems_anon;
 
 GRANT SELECT ON ems.vw_site_status           TO ems_anon;
+GRANT SELECT ON ems.vw_telemetry_heat_pump_15m_7d TO ems_anon;
 GRANT SELECT ON ems.vw_site_effective_price  TO ems_anon;
 GRANT SELECT ON ems.vw_latest_inverter       TO ems_anon;
 GRANT SELECT ON ems.vw_latest_heat_pump      TO ems_anon;

db/views/R__101_vw_telemetry_heat_pump_15m_7d.sql

@@ -0,0 +1,23 @@
+-- 15min agregace telemetrie TČ pro dashboard (TUV křivka v SocTuvChart).
+-- Teploty: avg přes přítomné řádky je OK (idle-skip ředí řádky, ale teplota
+-- není výkon — viz telemetry.md Idle-skip; nikdy z toho nepočítat energii).
+
+drop view if exists ems.vw_telemetry_heat_pump_15m_7d;
+
+create view ems.vw_telemetry_heat_pump_15m_7d as
+select
+  time_bucket(interval '15 minutes', t.measured_at) as slot_start,
+  t.site_id,
+  round(avg(t.tuv_tank_temp_c)::numeric, 1) as avg_tuv_c,
+  round(avg(t.water_outlet_temp_c)::numeric, 1) as avg_water_out_c,
+  round(avg(t.water_inlet_temp_c)::numeric, 1) as avg_water_in_c,
+  max(t.operating_mode) as operating_mode,
+  count(*) as sample_count
+from ems.telemetry_heat_pump t
+where t.measured_at > now() - interval '7 days'
+group by 1, 2;
+
+comment on view ems.vw_telemetry_heat_pump_15m_7d is
+  '15min agregace TČ telemetrie za 7 dní pro dashboard (TUV/voda křivky).';
+
+grant select on ems.vw_telemetry_heat_pump_15m_7d to ems_anon;