An EventSchema similar to the schema used in the MartenDB .NET client.

See the Marten documentation

Differences

MartenDB event records do not support a field for metadata or event tags. By default __metadata__ and __tags__ are used, but this may be configured when the database is created.

$ mix fact.create --path tmp/marten-ish \
    --event-schema marten@1 \
    --event-schema-options event_metadata=metadata,event_tags=tags

Additionally, Marten supports tenant_id and mt_dotnet_type fields, which Fact does not support at this time.

Example

When using marten@1, persisted event records will take the following shape, with the caveat that __metadata__ and __tags__ may differ if configured to something else.

{
  "data": {name: "Turts"},
  "id": "3bb4808303c847fd9ceb0a1251ef95da",
  "__metadata__": {"correlationId": "240d3c0e-3251-4076-a769-97a6a705533e"},
  "__tags__": ["turtle:1"],
  "type": "egg_hatched",
  "seq_id": "2",
  "timestamp": 1765039106962264,
  "stream_id": "turtle-1",
  "version": 1,
}