Eric Allam
4c58091973
## Why this change Deleting a `ProjectAlertChannel` fires the FK cascade `DELETE FROM ONLY "ProjectAlert" WHERE $1 = "channelId"`. That cascade is scan-shaped: with no index on `channelId`, it reads the entire `ProjectAlert` table to find the few child rows belonging to the deleted channel. The parent `DELETE ProjectAlertChannel` does almost no work itself; its latency is dominated by this cascade. `ProjectAlert` is append-heavy and grows over time, so the scan cost only increases. ## Diagnosis `ProjectAlert` had no index on `channelId` (only `pkey` + a `friendlyId` unique). The cascade therefore did a full sequential scan of the whole table. The sibling `ProjectAlertStorage` cascade on the same delete is index-backed and stays fast, which isolates the missing index as the cause. ## Change Add `@@index([channelId])` on `ProjectAlert`, created with `CREATE INDEX CONCURRENTLY IF NOT EXISTS` so `prisma migrate deploy` stays safe on a live table. ## Benchmark (local, seeded) Local Postgres seeded with 1,000,000 `ProjectAlert` rows across 50 channels (~20k rows per channel), `EXPLAIN (ANALYZE, BUFFERS)` on the cascade delete: | | before | after | |---|---|---| | plan | Seq Scan (1M rows) | Bitmap Index Scan | | direct child delete | 740 ms | 22 ms | | parent delete `ProjectAlert_channelId_fkey` trigger | 77.7 ms | 23.8 ms | ## Expected impact The cascade drops from a full-table sequential scan to a targeted index lookup. The win grows with the table: the more rows in `ProjectAlert`, the more a scan costs and the more the index saves, so the benefit is larger than the seeded numbers above. ## Risks - One extra btree to maintain on every `ProjectAlert` insert; acceptable for a single-column index on a high-insert table, and it should be pre-created before the migration deploys (per the repo index rules). - No behavior change: no rows orphaned, no ordering or result-set change, read paths untouched. ## Follow-up `ProjectAlert`'s other cascade FK columns (`projectId`, `environmentId`, `workerDeploymentId`) are also unindexed, but their parents are soft-deleted rather than physically removed, so those cascades do not currently fire. Lower priority unless a hard-delete path is introduced.
Server Changes
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File format
Create a markdown file with a descriptive name:
.server-changes/fix-batch-queue-stalls.md
With this format:
---
area: webapp
type: fix
---
Speed up batch queue processing by removing stalls and fixing retry race
Fields
- area (required):
webapp|supervisor - type (required):
feature|fix|improvement|breaking
Description
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Lifecycle
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.server-changes/file in their PR - Files accumulate on
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- After the release merges, CI cleans up the consumed files
Examples
New feature:
---
area: webapp
type: feature
---
TRQL query language and the Query page
Bug fix:
---
area: webapp
type: fix
---
Fix schedule limit counting for orgs with custom limits
Improvement:
---
area: webapp
type: improvement
---
Use the replica for API auth queries to reduce primary load