rollback upsert experiment, not working properly

schema/create.sql

@@ -49,14 +49,26 @@ create or replace function pv_stats_func ()
     language plpgsql 
 as $$
 declare
+    v_stat_id pv_stats_t.id%TYPE;
     v_dateTypes varchar[] := array['day', 'month', 'year'];
     v_dateType varchar;
 begin
     foreach v_dateType in array v_dateTypes
     loop
-      insert into pv_stats_t("date", dateType, first, total) 
-        values (date_trunc(v_dateType, NEW.time::date), v_dateType, NEW.exportEnergyActive, 0)
-        on conflict on constraint ddT_uk do update set total = NEW.exportEnergyActive - excluded.first;
+      select id 
+        from pv_stats_t 
+        into v_stat_id 
+        where "date" = date_trunc(v_dateType, NEW.time::date) and 
+              dateType = v_dateType;
+      if not found then
+        insert into pv_stats_t ("date", dateType, first) 
+          values (date_trunc(v_dateType, NEW.time::date), v_dateType, NEW.exportEnergyActive);
+      else
+        update pv_stats_t 
+          set total = NEW.exportEnergyActive - first 
+          where id = v_stat_id;
+      end if;
+
     end loop;
 
     return NEW;
@@ -70,7 +82,7 @@ create trigger pv_stats_trig
 
 
 
-insert into pv_stats_t("date", dateType, first, total) values ('2023-12-12', 'day', 12, 0)
-  on conflict on constraint ddT_uk do update set total = 15 - excluded.first;
+insert into pv_stats_t("date", dateType, first, total) values (date_trunc('month', now()), 'month', 0.01, 0)
+  on conflict on constraint ddT_uk do update set total = 3.26 - excluded.first;
 
 ;