perf(db): add RLS composite index, aggregate helper, and chunk tuning - #62
Merged
Conversation
Adds four database performance migrations, extracted and genericized from production learnings, that improve query performance for multi-tenant RLS-filtered access patterns on cml_data: - 010: composite index (user_id, cml_id, time DESC) so RLS-filtered queries can use a single index scan instead of scanning all users' data or requiring extra heap lookups. - 011: get_cml_aggregates() SECURITY DEFINER helper function for fast RLS-safe aggregated queries (e.g. from Grafana), avoiding security-barrier view overhead. - 012: reduce cml_data chunk_time_interval to 1 day and re-point the compression policy's compress_after to 1 day, bounding the size of the always-uncompressed open chunk for large tenants. - 013: covering index (INCLUDE sublink_id, rsl, tsl) on cml_data so open-chunk per-CML raw queries can be satisfied via index-only scan. Each migration includes measured performance rationale in its header comment. All are additive/non-destructive and safe to apply independently in numeric order after migrations 001-009.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #62 +/- ##
==========================================
+ Coverage 86.10% 87.59% +1.48%
==========================================
Files 39 35 -4
Lines 3418 3038 -380
==========================================
- Hits 2943 2661 -282
+ Misses 475 377 -98
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
|
cchwala
added a commit
that referenced
this pull request
Jul 25, 2026
A fresh DB (docker compose up with an empty volume) only runs init.sql; migration files under database/migrations/ are only for upgrading already-running deployments. init.sql was not updated when migrations 010-013 were merged (#62), so a fresh install was missing: - idx_cml_data_user_cml_time composite index (010) - get_cml_aggregates() RLS-safe aggregation helper (011) - 1-day chunk_time_interval + matching compress_after (012) - idx_cml_data_covering covering index (013) Verified by initializing a throwaway container from a clean volume and confirming the resulting schema matches (index definitions, chunk interval, compression policy config, and function signature).
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Adds four database performance migrations, extracted and genericized from production learnings, that improve query performance for multi-tenant RLS-filtered access patterns on cml_data:
Each migration includes measured performance rationale in its header comment. All are additive/non-destructive and safe to apply independently in numeric order after migrations 001-009.