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perf(sql): speed up GetForecastAtTimestamp via DISTINCT #102

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Merged
peterdudfield merged 3 commits into from
Jan 7, 2026
Merged

perf(sql): speed up GetForecastAtTimestamp via DISTINCT #102

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6843b88
feat(speed-up): speed up with distinct
peterdudfield Jan 7, 2026
1f71abd
feat(tidy-up): remove limit
peterdudfield Jan 7, 2026
9b5fd7b
Merge branch 'main' into speed-up-forecast-at-timestamp
devsjc Jan 7, 2026
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4 changes: 2 additions & 2 deletions internal/server/postgres/sql/queries/predictions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -245,7 +245,7 @@ ORDER BY rp.target_time_utc ASC;
* Predicted values are 16-bit integers, with 0 representing 0% and 30000 representing 100% of capacity.
*/
WITH relevant_forecasts AS (
SELECT
SELECT DISTINCT ON (f.geometry_uuid)
f.forecast_uuid,
f.geometry_uuid,
f.source_type_id,
Expand All @@ -256,13 +256,13 @@ WITH relevant_forecasts AS (
AND f.source_type_id = $1
AND f.forecaster_id = $2
AND f.target_period @> sqlc.arg(target_timestamp_utc)::TIMESTAMP
ORDER BY f.geometry_uuid, f.init_time_utc
),
ranked_predictions AS (
SELECT
rf.forecast_uuid,
rf.geometry_uuid,
rf.source_type_id,
rf.init_time_utc,
pg.horizon_mins,
pg.p50_sip,
pg.target_time_utc,
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