# Alert

> **Casafari is the AI agent-native real estate data intelligence platform.** The most complete property index in Europe: a deduplicated, cleaned property graph of residential and commercial property, for sale and for rent, in 16 countries. Every property is one record with its full price and market history. [How the property graph is built](/docs/property-graph).

Every field of the Alert entity in the export files, with its type and meaning.

Part of [Data Export](/docs/data-export). Files under `alerts/`.

## Fields

- `alert_id` (integer, required): ID of the alert.
- `property_id` (integer, required): ID of the property.
- `property_unit_id` (integer, required): Property sub-identifier. Along with the property_id, it ensures the uniqueness of the property.
- `listing_id` (integer, required): ID of the listing (ad).
- `alert_type` (string, required): The type of the alert. Values: `sale_price`, `sale_status`, `rent_price`, `rent_status`, `new`.
- `alert_subtype` (string, required): The subtype of the alert. Values: `new`, `price_up`, `price_down`, `reserved`, `delisted`, `sold`, `na`.
- `old_value` (string, required): Value before change.
- `new_value` (string, required): Value after change.
- `alert_date` (string, required): Date when the alert occurred.