fix(ansem): survive a slow memories table (site-down fix)

[sebbsssss]

The outage

clude.io/ansem rendered empty. Server was healthy (/health 200, /feed and /attestations ~0.1s) — only the two routes that read memories hung:

Failed to fetch Ansem memories for graph  module="ansem-routes"
err={"message":"canceling statement due to statement timeout","code":"57014"}

Root cause

memories grows ~12–20k rows/day via the 24/7 live ingest and outgrew its indexes. Existing indexes are all single-column (owner_wallet, importance, created_at) with nothing on source, so:

• /graph sorts the entire filtered set by importance DESC, id to take the top 1000 (twice, paged)
• /growth ran ~10 sequential exact COUNTs per refresh, with no coordination between concurrent callers

Both blew the statement timeout. /graph 500'd → empty constellation → "site is dead".

This PR (application resilience)

/graph

• Caches the last good payload; serves it stale on any error/timeout instead of 500 — a stale constellation beats a blank page
• Deadlines the exact count (6s) and each node page (9s) so a stall degrades fast rather than holding the request for the full Postgres timeout

/growth

• Single-flight guard — concurrent visitors share one refresh instead of each launching a count storm (the main load amplifier)
• Counts now run in parallel rather than sequentially
• Stale-while-revalidate — a warm cache never waits on the DB
• 8s deadline on a cold refresh, falling back to the existing zeros fail-safe
• TTL 15 → 30 min; ANSEM_GROWTH=false env kill switch to shed all growth DB work instantly

Does not touch config.ts (drift trap avoided). Typecheck clean on the changed file.

Still required — the actual fix

Composite indexes (run separately, CONCURRENTLY since ingest writes 24/7):

CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_memories_owner_source_importance
  ON memories (owner_wallet, source, importance DESC, id);
CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_memories_owner_source_created
  ON memories (owner_wallet, source, created_at);

🤖 Generated with Claude Code

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