perf(projects): bulk SQL replaces N+1 stats loop on /api/projects (26s → 3s cold)#65
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The dashboard loads /api/projects?include_stats=true on first paint. On a 188-project / 228K-message store this took 26s cold because the route ran the per-project aggregator pipeline once per project. This commit replaces that loop with three bulk passes: - bulk_session_counts(): one GROUP BY for file_count - bulk_project_lite_stats(): one GROUP BY for tokens / dates / message counts, sufficient for the project-list cards - bulk_project_cost(): per-(project_id, model, speed) rollup folded through compute_cost(); honours fast-mode multipliers Also memoises _dir_size_mb by (path, mtime) so repeat calls don't re-glob 188 directories. Result on the user's real store: cold: 26152 ms → 3175 ms (8.2x) warm: 504 ms → 443 ms (small; bounded by SQL pass) The aggregator-only fields (avg_steps_per_command, compact_summary_count, avg_tokens_per_command) default to 0 in the list view — they're only meaningful in the per-project detail view, which still runs the full aggregator on demand via /api/dashboard-data. 1333 backend tests pass. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Numbers (real local data)
8.2× cold-load speedup. Warm is bounded by SQL (3 GROUP BYs on 228K messages); could be cached with TieredCache as a follow-up.
Test plan
🤖 Generated with Claude Code