sql first refactor

db/routines/R__fn_ote_day_slot_stats_prague.sql

@@ -0,0 +1,42 @@
+-- statistiky importovaných OTE slotů pro kalendářní den v Europe/Prague
+
+create or replace function ems.fn_ote_day_slot_stats_prague(p_day date)
+returns jsonb
+language sql
+stable
+as $fn$
+  select jsonb_build_object(
+    'count',
+    coalesce(
+      (
+        select count(*)::int
+        from ems.market_interval_price mip
+        where mip.market_source = 'OTE_CZ'
+          and (mip.interval_start at time zone 'Europe/Prague')::date = p_day
+      ),
+      0
+    ),
+    'first_price',
+    (
+      select mip.buy_raw_price_czk_kwh
+      from ems.market_interval_price mip
+      where mip.market_source = 'OTE_CZ'
+        and (mip.interval_start at time zone 'Europe/Prague')::date = p_day
+      order by mip.interval_start
+      limit 1
+    ),
+    'is_complete',
+    coalesce(
+      (
+        select count(*)::int
+        from ems.market_interval_price mip
+        where mip.market_source = 'OTE_CZ'
+          and (mip.interval_start at time zone 'Europe/Prague')::date = p_day
+      ),
+      0
+    ) in (92, 96, 100)
+  );
+$fn$;
+
+comment on function ems.fn_ote_day_slot_stats_prague(date) is
+  'Počet slotů OTE_CZ, první cena a zda den vypadá kompletně (92/96/100) v TZ Praha.';