Blog: Unblocking apps by fixing a performance bottleneck#3
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Story of diagnosing and fixing the shard_core auth hot path: a 4-connection psycopg pool exhausted by SPA request bursts, fixed with signal-invalidated in-process caching for zero DB queries on the hot path. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Adds a new blog post at
docs/blog/posts/2026-05-29_unblocking_apps_performance_bottleneck/.What
main.md— the post (author: max,draft: false, dated 2026-05-29).cover.png— lead image.Content
Walkthrough of a real shard_core fix: the
/internal/authforwardAuth hot path pulled two connections per request from a 4-connection psycopg pool. SPA first-paint bursts (Immich, Actual Budget, KitchenOwl) exhausted the pool, blocked, and hit the 45s browser timeout — apps that looked "slow" were actually broken. Fixed with in-process caching invalidated via the existing Blinker signal bus, taking the hot path to zero DB queries.Includes a Mermaid request-flow diagram.
Notes
mkdocs build --strictpasses; the new post renders with no warnings.draft: false— publishes on merge. Flip totrueif you want to hold it.🤖 Generated with Claude Code