sql first refactor

db/views/R__vw_battery_cycle_daily.sql

@@ -0,0 +1,23 @@
+-- denní součet |battery_power_w|/60 Wh → poměr k 2× usable (orientační cykly/den)
+
+create or replace view ems.vw_battery_cycle_daily as
+select
+  ti.site_id,
+  (ti.measured_at at time zone 'Europe/Prague')::date as day_prague,
+  sum(abs(ti.battery_power_w::numeric) / 60.0) as throughput_wh,
+  max(ab.usable_wh) as usable_wh,
+  round(
+    (sum(abs(ti.battery_power_w::numeric) / 60.0)
+      / nullif(max(ab.usable_wh) * 2, 0))::numeric,
+    4
+  ) as equiv_full_cycles
+from ems.telemetry_inverter ti
+cross join lateral (
+  select usable_capacity_wh::numeric as usable_wh
+  from ems.asset_battery b
+  where b.site_id = ti.site_id
+  order by b.id
+  limit 1
+) ab
+where ti.battery_power_w is not null
+group by ti.site_id, (ti.measured_at at time zone 'Europe/Prague')::date;