# HydrationState
**Source definition:** [`src/bitdrift/public/unary/timeline/v1/hydration.proto#L25-L43`]()
| Field | Type | Description |
|---|---|---|
| created_at | [google.protobuf.Timestamp](https://protobuf.dev/reference/protobuf/google.protobuf/#timestamp "google.protobuf.Timestamp") | The time when the hydration record was created. |
| expiration_time | [google.protobuf.Timestamp](https://protobuf.dev/reference/protobuf/google.protobuf/#timestamp "google.protobuf.Timestamp") | The time when the hydrated session data expires. |
| started_at | [google.protobuf.Timestamp](https://protobuf.dev/reference/protobuf/google.protobuf/#timestamp "google.protobuf.Timestamp") | The time when hydration started. |
| finished_at | [google.protobuf.Timestamp](https://protobuf.dev/reference/protobuf/google.protobuf/#timestamp "google.protobuf.Timestamp") | The time when hydration finished. |
| hydration_status | [bitdrift.public.unary.timeline.v1.HydrationStatus](bitdrift_public_unary_timeline_v1_HydrationStatus.md "bitdrift.public.unary.timeline.v1.HydrationStatus") | The current hydration status of the session. |
| incremental | bool | Whether the hydration was performed incrementally. |
Example
```json
{
"created_at": "2024-01-15T09:30:00Z",
"expiration_time": "2024-01-15T09:30:00Z",
"finished_at": "2024-01-15T09:30:00Z",
"hydration_status": "HYDRATING",
"incremental": false,
"started_at": "2024-01-15T09:30:00Z"
}
```