sql first refactor

db/routines/R__fn_latest_ote_day_stats.sql

@@ -0,0 +1,23 @@
+create or replace function ems.fn_latest_ote_day_stats()
+returns jsonb
+language sql
+stable
+as $fn$
+  select to_jsonb(sub)
+  from (
+    select
+      (mip.interval_start at time zone 'Europe/Prague')::date as latest_date,
+      count(*)::int as slots,
+      min(mip.buy_raw_price_czk_kwh)::float as min_price,
+      max(mip.buy_raw_price_czk_kwh)::float as max_price,
+      avg(mip.buy_raw_price_czk_kwh)::float as avg_price
+    from ems.market_interval_price mip
+    where mip.market_source in ('OTE_CZ', 'OTE_CZ_DAM')
+    group by (mip.interval_start at time zone 'Europe/Prague')::date
+    order by latest_date desc
+    limit 1
+  ) sub;
+$fn$;
+
+comment on function ems.fn_latest_ote_day_stats() is
+  'Agregace posledního kalendářního dne s OTE daty (globální, bez site_id).';