speedup zalozka planning

db/migration/V079__pv_delta_profile_cache.sql

@@ -0,0 +1,23 @@
+-- Cache výsledku fn_pv_forecast_delta_profile per site (obnovuje job fn_fill_forecast_accuracy).
+-- Zrychlení GET /plan/current a plánování (canonical PV forecast).
+
+alter table ems.site_pv_forecast_calibration
+  add column if not exists delta_profile_cache jsonb null,
+  add column if not exists delta_profile_cached_at timestamptz null;
+
+comment on column ems.site_pv_forecast_calibration.delta_profile_cache is
+  'Poslední JSON z fn_pv_forecast_delta_profile (120d lookback, now); NULL = ještě nepočítáno.';
+
+comment on column ems.site_pv_forecast_calibration.delta_profile_cached_at is
+  'Čas posledního refresh cache (fn_refresh_site_pv_delta_profile_cache).';
+
+create index if not exists idx_planning_run_site_comparison_of
+  on ems.planning_run (
+    site_id,
+    ((solver_params->>'comparison_of_run_id')::int),
+    created_at desc
+  )
+  where status = 'comparison';
+
+comment on index ems.idx_planning_run_site_comparison_of is
+  'Rychlé nalezení comparison runu pro GET /plan/compare (comparison_of_run_id v solver_params).';