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Drop ivfflat index on contact_embeddings (breaks search on small tables) #40

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Merged
kayoslab merged 1 commit into from
Jul 9, 2026
Merged

Drop ivfflat index on contact_embeddings (breaks search on small tables) #40

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21 changes: 7 additions & 14 deletions scripts/setup-contacts-db.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -93,20 +93,13 @@ async function main() {
CREATE INDEX IF NOT EXISTS contact_embeddings_profile_idx
ON contact_embeddings USING gin (profile)
`;
try {
await sql`
CREATE INDEX IF NOT EXISTS contact_embeddings_embedding_idx
ON contact_embeddings
USING ivfflat (embedding vector_cosine_ops)
WITH (lists = 100)
`;
console.log("✅ contact_embeddings table + vector index ready\n");
} catch (error) {
console.log(
"⚠️ Vector index skipped (created after first rows):",
error instanceof Error ? error.message.split("\n")[0] : String(error)
);
}
// No approximate vector index (ivfflat/hnsw) on purpose. A personal contact
// store is small, so an exact sequential scan is fast and always correct.
// An ivfflat index with lists=100 + default probes=1 silently returns zero
// rows on a tiny table (it only scans one of 100 clusters). Add HNSW only if
// this ever grows into the tens of thousands of contacts.
await sql`DROP INDEX IF EXISTS contact_embeddings_embedding_idx`;
console.log("✅ contact_embeddings table + indexes ready\n");

// 5. Verify
console.log("5️⃣ Verifying tables...");
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