# Ingestion to local Historian (Edge)

Local ingestion lets you persist measurements from selected tags to one or more historians running on the edge device. 

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### Local Ingestion (Edge)

A prerequisite for implementing local ingestion is that one or more Historian Data Connectors are added to the Asset Hierarchy. 

Currently the Historian Data Connector only supports the following database types:

* **TimescaleDb**: TimescaleDB is a PostgreSQL **extension** purpose-built for time-series and event data, designed for high-rate inserts and fast time-range queries, while leveraging the full SQL and the Postgres ecosystem.

When multiple historians are present, each Tag can be pointed to the **specific historian** you want. This gives you fine-grained control over where different datasets are stored locally.

Adding a **Historian** Data Connector at an **Area** enables **local ingestion** for every Tag beneath that Area in the Asset Hierarchy. 

To add a historian connector, follow the setup steps in the [**Data Connectors** documentation](https://docs.tricloudnexus.io/management-portal/designer/assets/data-connectors/historian).

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### Configuring Tag

Once a Historian is configured, eligible Tags gain the option to store their measurements locally. 

<figure><img src="https://570593659-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYMGRODsc2QD3N3wmfwTl%2Fuploads%2F1IljwmH9wGBIgIycQlMg%2Fimage.png?alt=media&#x26;token=6d25d233-ccef-4838-9308-5706d2e1c638" alt=""><figcaption><p>Shows the Store tab for a Tag, where local ingestion is enabled to a server called MyLocalHistorian.</p></figcaption></figure>

The configuration needed is:

* **Local Ingestion (Edge):** This enables or disables the functionality to stored measurements to a local historian.
* Local Historian Upload Rate: Similarly to the Cold Path Upload Rate, this specifies how often data is uploaded to a local historian. If "Default" is selected, then the upload rate is set to the default value, as defined in the Data Connector settings.