fix: stabilize membersGlobalActivityCount mv refresh (CM-1302)

[skwowet]

Summary

The refreshMemberEnrichmentMaterializedViews workflow was failing because REFRESH MATERIALIZED VIEW "membersGlobalActivityCount" exceeded the 10-minute activity timeout. As memberSegmentsAgg grew (~239M rows), refresh duration crossed that limit. Unlimited activity retries left zombie PG sessions holding exclusive locks, which also blocked member list queries.

Changes

• Increase activity startToCloseTimeout from 10 to 45 minutes
• Cap activity retries at 3 attempts with backoff
• Use REFRESH MATERIALIZED VIEW CONCURRENTLY so reads on the MV are not blocked during refresh
• Remove ORDER BY from the membersGlobalActivityCount MV definition (enrichment already sorts in its own query; removes an extra sort over ~635K rows on each refresh)

[Copilot]

Pull request overview

This PR addresses Temporal workflow failures and query blocking caused by long-running refreshes of the membersGlobalActivityCount materialized view as the underlying memberSegmentsAgg table grows. It increases the activity timeout, limits retries to prevent lingering Postgres sessions/locks, and makes the refresh non-blocking for readers by switching to a concurrent refresh while also removing an unnecessary ORDER BY from the MV definition.

Changes:

• Increased the Temporal activity startToCloseTimeout for MV refresh from 10 to 45 minutes and added a capped retry policy (max 3 attempts with backoff).
• Switched MV refresh to REFRESH MATERIALIZED VIEW CONCURRENTLY for membersGlobalActivityCount.
• Removed ORDER BY from the membersGlobalActivityCount MV definition to avoid extra sorting work during refresh.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
services/apps/members_enrichment_worker/src/workflows/refreshMemberEnrichmentMaterializedViews.ts	Increases activity timeout and adds bounded retries to stabilize the MV refresh workflow.
services/apps/members_enrichment_worker/src/activities/enrichment.ts	Enables concurrent MV refresh in the activity implementation to avoid blocking readers.
backend/src/database/migrations/R__memberEnrichmentMaterializedViews.sql	Removes unnecessary ORDER BY from the MV definition to reduce refresh cost.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.