- get_snapshot queries snapshot by id/device/tenant, decrypts via Transit
- get_snapshot_diff queries diff by new_snapshot_id with device/tenant filter
- Both return None for missing data (404-safe)
- 4 new tests with mocked Transit and DB sessions
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Service queries router_config_changes JOIN router_config_diffs for timeline
- Returns paginated entries with component, summary, timestamp, diff metadata
- ORDER BY created_at DESC with limit/offset pagination
- 4 tests covering formatting, empty results, pagination, and ordering
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>