Cursor rule

1---
2description: "Core project conventions for Second Brain monorepo"
3mode: always
4---
5 
6# Second Brain — Cursor Rules
7 
8Developer knowledge graph. pnpm monorepo, Turborepo, Node.js 22+, TypeScript 5.8+ strict, ESM only.
9 
10For full context, see @docs/architecture.md and @AGENTS.md.
11 
12## Stack
13- SQLite (better-sqlite3) + Drizzle ORM + FTS5 + sqlite-vec
14- Zod v4 for validation, ULIDs for IDs, ISO 8601 timestamps
15- Vitest with in-memory SQLite for tests
16- tsdown for builds, tsc for type-checking
17 
18## Rules
19- ESM only. Named exports. Re-export from index.ts
20- Use workspace imports: `@second-brain/core`, `@second-brain/types`
21- No `any`. No path aliases. No UUIDs. No unix timestamps
22- Namespace field on all entities/relations: 'personal' or project ID
23- FTS5 triggers auto-maintain search index — never write to entities_fts
24- Confidence decay is read-side only — never mutate stored confidence
25- batchUpsert for bulk operations (merges observations/tags)
26