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# System prepended metadata

title: Package structure

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# Package structure

| field | value | description |
| ----- | ----- | ----------- |
| uuid  | `uuidv1()-uuidv4()` |
| instance | `{}` | 
| session | `{ id, entities }` |
| entity | `{ from: { id }, to: { id, ids } }` |
| platform | `{ fromId, toId }` |
| workspace | `{ id, fullName, entityId, from: { id, fullName }, to: { id, fullName } }` |
| ignoredStages | `{ [stage]: true }` | events => ignoredStages
| message | `{ type, sentAt, systemEventId?, data?, subType? }` |