speedup srovnani

db/migration/V070__forecast_accuracy_delta_profile_index.sql

@@ -0,0 +1,16 @@
+-- Zrychlení fn_pv_forecast_delta_profile (volá ho pv-slots-corrected): range scan site + interval_start
+-- s podmínkami učení bez sekvenčního full scanu větší historie.
+
+create index if not exists idx_forecast_accuracy_site_interval_delta_profile
+  on ems.forecast_accuracy (
+    site_id,
+    interval_start desc,
+    pv_array_id,
+    forecast_created_at desc
+  )
+  where actual_power_w is not null
+    and coalesce(learning_eligible, true) = true
+    and forecast_created_at <= interval_start;
+
+comment on index ems.idx_forecast_accuracy_site_interval_delta_profile is
+  'Partial index pro výběr posledního forecast runu na slot (DISTINCT ON interval_start, pv_array_id) v delta profilu.';