Add MySQL procedure and event to forward fill table pvlive.pvgenerati…

README.md

@@ -1,2 +1,8 @@
 # pvgenerationforwardfill
 MySql procedure and event to forward fill table pvlive.pvgeneration
+
+#Forward fill the pvgeneration table during hours of darkness today and ndays hence: 
+#  generation_MW=0, capacity_MWp and installedcalacity_MWp same as yesterday.
+#Julian Briggs
+#4-feb-2025
+

forwardfill_event.sql

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+CREATE EVENT forwardfill
+ON SCHEDULE EVERY 1 DAY
+STARTS '2025-02-04 00:00:00.000'
+ON COMPLETION PRESERVE
+ENABLE
+DO CALL pvlive.forwardfill()

forwardfill_procedure.sql

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+CREATE DEFINER=`admin`@`localhost` PROCEDURE `pvlive`.`forwardfill`()
+BEGIN
+#Forward fill the pvgeneration table during hours of darkness today and ndays hence: 
+#  generation_MW=0, capacity_MWp and installedcalacity_MWp same as yesterday.
+#Julian Briggs
+#4-feb-2025
+
+declare ndays int default 7;
+#
+#Create and populate a temporary table of 48 timestamps at 30 minute intervals (on the hour and half hour) 
+#from now (rounded up) and ndays days hence
+DROP TEMPORARY TABLE IF EXISTS times;
+
+DROP TEMPORARY TABLE IF EXISTS timestamps;
+
+#Table times: column _time is generated from column i (just before a select)
+create temporary table times (i int unsigned, _time time generated always as (time('00:00:00') + INTERVAL i * 30 MINUTE));
+
+create temporary table timestamps (_date date, datetime_GMT timestamp );
+#
+#Populate table times: column _time is generated from column i (just before a select)
+INSERT INTO times (i)
+values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),(16),(17),(18),(19),(20),(21),(22),(23),(24),(25),(26),(27),(28),(29),(30),(31),(32),(33),(34),(35),(36),(37),(38),(39),(40),(41),(42),(43),(44),(45),(46),(47);
+#
+#Populate table timestamps with timestamps every 30 mins on the hour and half hour before sunrise and after sunset, today and ndays hence
+insert into timestamps (datetime_GMT) select timestamp(ss.date, times._time)
+from times
+join pvstream.sunrise_sunset ss
+where ss.date between CURRENT_DATE() and CURRENT_DATE() + interval ndays day
+and times._time not between earliest_sunrise and latest_sunset;
+#
+#Forward fill table pvgeneration every 30 mins (on the hour and half hour) before sunrise and after sunset, today and ndays hence 
+#Join table pvgeneration (single row yesterday at noon) to table gsp_20220314 (to get all gsp_ids, pvgenration=0, capacity_MWp, installedcapacity_MWp)
+#Then join to table timestamps (to get rows for all gsps and all (48 half hourly) datetime_gmt)
+insert into
+	pvgeneration (gsp_id, datetime_GMT, generation_MW, capacity_MWp, installedcapacity_MWp
+	 )
+	 select g.gsp_id, timestamps.datetime_GMT, 0, capacity_MWp, installedcapacity_MWp
+from gsp_20220314 g
+join 
+pvgeneration p on
+(p.gsp_id = g.gsp_id
+	and p.datetime_gmt = timestamp(CURRENT_DATE()- interval 12 hour))
+join timestamps
+order by
+	g.gsp_id, timestamps.datetime_GMT
+ON
+DUPLICATE KEY UPDATE generation_MW = 0, capacity_MWp = p.capacity_MWp, installedcapacity_MWp = p.installedcapacity_MWp;
+
+END