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Kpa-clawbot
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## Summary Implements `GET /api/backup` — one-click SQLite database export per #474. Operators can now grab a complete, consistent snapshot of the analyzer DB with a single authenticated request — no SSH, no scripts, no DB tooling. ## Endpoint ``` GET /api/backup X-API-Key: <key> # required → 200 OK Content-Type: application/octet-stream Content-Disposition: attachment; filename="corescope-backup-<unix>.db" <body: complete SQLite database file> ``` ## Approach Uses SQLite's `VACUUM INTO 'path'` to produce an atomic, defragmented copy of the database into a fresh file: - **Consistent**: VACUUM INTO runs at read isolation — the snapshot reflects a single point in time even while the ingestor is writing to the WAL. - **Non-blocking**: writers continue uninterrupted; we never hold a write lock. - **Works on read-only connections**: verified manually against a WAL-mode source DB (`mode=ro` connection successfully produces a snapshot). - **No corruption risk**: even if the live on-disk DB has issues, VACUUM INTO surfaces what the server can read rather than copying broken pages byte-for-byte. The snapshot is staged in `os.MkdirTemp(...)` and removed after the response body is fully streamed (deferred cleanup). Requesting client IP is logged for audit. The issue suggested an alternative in-memory rebuild path; `VACUUM INTO` is simpler, faster, and produces a strictly more accurate copy of what the server actually sees, so going with it. ## Security - Mounted under `requireAPIKey` middleware — same gate as other admin endpoints (`/api/admin/prune`, `/api/perf/reset`). - Returns 401 without a valid `X-API-Key` header. - Returns 403 if no API key is configured server-side. - `X-Content-Type-Options: nosniff` set on the response. ## TDD - **Red** (`99548f2`): `cmd/server/backup_test.go` adds `TestBackupRequiresAPIKey` + `TestBackupReturnsValidSQLiteSnapshot`. Stub handler returns 200 with no body so the tests fail on assertions (Content-Type / Content-Disposition / SQLite magic header), not on import or build errors. - **Green** (`837b2fe`): real implementation lands; both tests pass; full `go test ./...` suite stays green. ## Files - `cmd/server/backup.go` — handler implementation - `cmd/server/backup_test.go` — red-then-green tests - `cmd/server/routes.go` — route registration under `requireAPIKey` - `cmd/server/openapi.go` — OpenAPI metadata so `/api/openapi` advertises the endpoint ## Out of scope (follow-ups) - Rate limiting (issue suggested 1 req/min). Not added here — admin-key-gated endpoint with a fast snapshot path is acceptable for v1; happy to add a token-bucket limiter in a follow-up if operators report hammering. - UI button to trigger the download (frontend work — separate PR). Fixes #474 --------- Co-authored-by: corescope-bot <bot@corescope.local>