# app.lexidraw.sceneRevision

> Published by [lexidraw.app](https://lexicon.garden/identity/did:web:lexidraw.app)

✓ This is the authoritative definition for this NSID.

## Links

- [View on Lexicon Garden](https://lexicon.garden/lexicon/did:web:lexidraw.app/app.lexidraw.sceneRevision)
- [Documentation](https://lexicon.garden/lexicon/did:web:lexidraw.app/app.lexidraw.sceneRevision/docs)
- [Examples](https://lexicon.garden/lexicon/did:web:lexidraw.app/app.lexidraw.sceneRevision/examples)

## Definitions

### `app.lexidraw.sceneRevision`

**Type**: `record`

An immutable checkpoint of a app.lexidraw.scene record. Captured periodically alongside the mutable scene record; the scene blob is content-addressed and shared with the scene record, so no data is duplicated.

**Key**: `tid`

| Property | Type | Required | Description |
|----------|------|----------|-------------|
| `scene` | `blob` | Yes | Gzipped Excalidraw scene JSON (serializeAsJSON output, gzip level 6), as captured at checkpoint time. |
| `thumb` | `blob` | No | WebP preview of the scene (max 1024px on the longest side). |
| `subject` | `ref` → `com.atproto.repo.strongRef` | Yes | Strong reference (uri + record cid) to the parent app.lexidraw.scene record at checkpoint time. |
| `createdAt` | `string` (datetime) | Yes |  |

## Raw Schema

```json
{
  "id": "app.lexidraw.sceneRevision",
  "defs": {
    "main": {
      "key": "tid",
      "type": "record",
      "record": {
        "type": "object",
        "required": [
          "subject",
          "scene",
          "createdAt"
        ],
        "properties": {
          "scene": {
            "type": "blob",
            "accept": [
              "application/gzip"
            ],
            "maxSize": 50000000,
            "description": "Gzipped Excalidraw scene JSON (serializeAsJSON output, gzip level 6), as captured at checkpoint time."
          },
          "thumb": {
            "type": "blob",
            "accept": [
              "image/webp"
            ],
            "maxSize": 2000000,
            "description": "WebP preview of the scene (max 1024px on the longest side)."
          },
          "subject": {
            "ref": "com.atproto.repo.strongRef",
            "type": "ref",
            "description": "Strong reference (uri + record cid) to the parent app.lexidraw.scene record at checkpoint time."
          },
          "createdAt": {
            "type": "string",
            "format": "datetime"
          }
        }
      },
      "description": "An immutable checkpoint of a app.lexidraw.scene record. Captured periodically alongside the mutable scene record; the scene blob is content-addressed and shared with the scene record, so no data is duplicated."
    }
  },
  "$type": "com.atproto.lexicon.schema",
  "lexicon": 1
}
```