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feat: add SQLite database layer - #1
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- createDatabase() factory with WAL mode + foreign keys - Typed query helpers: signals, sessions, features namespaces - Privacy enforcement: signals.insert() rejects string values - Foreign key constraint test: orphaned feature vectors rejected - Tests: 9/9 passing schema.ts: raw_signals, local_sessions, feature_vectors tables database.ts: prepared statements, zero raw string queries
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What this adds
src/db/schema.ts— table definitions for raw_signals, local_sessions, feature_vectorssrc/db/database.ts— typed query helpers with prepared statementstests/db/database.test.ts— 9 tests covering all helpers + privacy constraintsPrivacy
Tests
19/19 passing (10 anonymizer + 9 database)
Checklist