feat(db): SQLite module + initial migration (Task #1)#17
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Introduce bun:sqlite-backed db module with WAL mode, foreign keys, and a meta-table-driven migration runner. Initial schema (001) creates accounts, model_pricing, model_pricing_versions, pricing_sync_log, usage_events, usage_daily and supporting indexes. - src/lib/db.ts: initDb/getDb/withTransaction + test-only reset helper - src/lib/migrations/001_initial.sql: full schema per design doc 02 - src/lib/paths.ts: USAGE_DB_PATH under APP_DIR - src/start.ts: --db-path flag, initDb after ensurePaths - src/types.d.ts: declare *.sql text imports - tests/db.test.ts: 8 tests covering init, idempotency, tx, WAL, indexes Closes #1 Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>
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Summary
src/lib/db.tswithinitDb/getDb/withTransactionoverbun:sqlite(WAL, FK on, NORMAL sync)meta.schema_version; ships migration 001 with the full schema (accounts, model_pricing[+versions], pricing_sync_log, usage_events, usage_daily, indexes)initDbintorunServerand add--db-pathflag (defaults to~/.local/share/copilot-api/usage.sqlite)Test plan
bun test— 37 pass (8 new intests/db.test.ts)bun run typecheckcleanbun run lintcleanCloses #1
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