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fix: slow query taking up 66% of db time (#298)

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Query was scanning the full index on listen table,
when we really only need data from the last hour
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Julian Tölle 2023-09-18 21:15:37 +02:00 • committed by GitHub
parent 7f5328e538
commit 625db7dbe7
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5
src/sources/spotify/spotify.service.ts
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@ -42,6 +42,10 @@ export class SpotifyService {
private readonly spotifyAuth: SpotifyAuthService,
) {}
/**
* Returns a list of users that should be crawled for new listens.
* Only returns the lastListen date if it was within the last hour.
*/
@Span()
async getCrawlableUserInfo(): Promise<
{ userID: string; lastListen: Date }[]
@ -57,6 +61,7 @@ export class SpotifyService {
.select(`listen."userId"`)
.addSelect(`listen."playedAt"`)
.from("listen", "listen")
.where(`listen."playedAt" > now() - interval '1 hour'`)
.orderBy("listen.userId", "DESC")
.addOrderBy("listen.playedAt", "DESC"),
"listen",