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Faster datapoint latest value display

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Magnus Åhall 2024-07-24 15:39:04 +02:00
parent f8a64e4dfd
commit 570ea064aa
2 changed files with 18 additions and 25 deletions
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6
sql/00026.sql
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@ -1,4 +1,5 @@
/* Adding last values to the datapoint table since they are a regularly used value. */
ALTER TABLE public.datapoint ADD COLUMN last_value_id int4 NULL;
ALTER TABLE public.datapoint ADD COLUMN last_value_int int8 NULL;
ALTER TABLE public.datapoint ADD COLUMN last_value_string varchar NULL;
ALTER TABLE public.datapoint ADD COLUMN last_value_datetime timestamptz NULL;
@ -8,12 +9,14 @@ ALTER TABLE public.datapoint ADD COLUMN last_value_datetime timestamptz NULL;
/* Once-run query to update it to the latest, to avoid user having to wait for the next entry. */
UPDATE public.datapoint AS dp
SET
last_value_id = dpv.id,
last_value_int = dpv.value_int,
last_value_string = dpv.value_string,
last_value_datetime = dpv.value_datetime
FROM (
SELECT
dp.id AS datapoint_id,
dpv.id,
dpv.value_int,
dpv.value_string,
dpv.value_datetime
@ -39,6 +42,9 @@ $$
BEGIN
UPDATE public.datapoint
SET
nodata_is_problem = false,
last_value = NEW.ts,
last_value_id = NEW.id,
last_value_int = NEW.value_int,
last_value_string = NEW.value_string,
last_value_datetime = NEW.value_datetime