perf: precompute org page contributors leaderboard

[epipav]

Optimizes org_page_contributors endpoint pipe with a nightly dedicated precompute copy pipe

[cursor]

PR Summary

Medium Risk
Analytics-only Tinybird change, but the copy pipe is a heavy nightly full-table aggregation and all-time leaderboard numbers will be up to ~24h stale until the first successful run.

Overview
Speeds up the default (all-time) org page contributors leaderboard by serving precomputed per-(organization, member) counts instead of scanning the full activityRelations cleaned bucket union (~744M rows) on every request.

Adds a nightly replace-mode copy pipe (03:50 UTC) that writes ~2M aggregated rows into org_page_contributors_copy_ds. org_page_contributors.pipe uses that table when startDate/endDate are omitted; date-filtered queries still scan the live union. All-time counts can lag by up to a day.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

COPY schedule collides overnight

High Severity

COPY_SCHEDULE 50 3 * * * overlaps activityRelations_by_member_copy (starts 35 3, ~22 min over a full activity scan) and spills into the 4 AM collection-bucket band. This full scan of activityRelations_deduplicated_cleaned_bucket_union (~744M rows) can push concurrent copy jobs over the account quota of 12, leaving pipes permanently queued and emptying downstream datasources.

 

^{Triggered by learned rule: Tinybird COPY pipe schedules must not collide — account concurrent quota is 12}

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