# Snapshot

**Status:** Design/Planning
**Source:** N/A (cross-cutting concept)
**Owner:** Platform Team

## Purpose

Snapshot defines the knowledge snapshot model for deterministic, point-in-time captures of StellaOps data. Enables offline operation, merge preview, replay, and air-gap export with cryptographic integrity.

## Components

**Concept Documentation:**
- `merge-preview.md` - Merge preview specification
- `replay-yaml.md` - Replay YAML format and semantics

**Snapshot Types:**
- Advisory snapshots (Concelier ingestion state)
- VEX snapshots (VexHub distribution state)
- SBOM snapshots (SbomService repository state)
- Policy snapshots (Policy Engine rule state)
- Task pack snapshots (PacksRegistry versions)

## Implementation Locations

Snapshot functionality is implemented across multiple modules:
- **AirGap** - Snapshot export/import orchestration
- **ExportCenter** - Snapshot bundle creation
- **Replay** - Deterministic replay from snapshots
- **Concelier** - Advisory snapshot merge preview
- All data modules (snapshot sources)

## Dependencies

- AirGap (snapshot orchestration)
- ExportCenter (bundle creation)
- Replay (snapshot replay)
- All data modules (snapshot sources)

## Related Documentation

- Merge Preview: `./merge-preview.md`
- Replay YAML: `./replay-yaml.md`
- AirGap: `../airgap/`
- ExportCenter: `../export-center/`
- Replay: `../replay/` (if exists)
- Offline Kit: `../../24_OFFLINE_KIT.md`

## Current Status

Snapshot concepts documented in merge-preview.md and replay-yaml.md. Implementation distributed across AirGap (export/import), ExportCenter (packaging), and Replay (playback) modules. Used for offline/air-gap operation.