data.home-assistant/docs/data_context.md

title	sidebar_label
Home Assistant Context	Context

Context is used to tie events and states together in Home Assistant. Whenever an automation or user interaction triggers a new change, a new context is assigned. This context will be attached to all events and states that happen as result of the change.

In the following example, all events and states will share the same context:

• Paulus arrives home, which updates device_tracker.paulus_pixel from not_home to home
• The automation "Paulus is home" is triggered and fires automation_triggered event.
• The automation calls service light.turn_on, which fires the service_call event.
• The light.turn_on service turns on the light which causes an update to the state of light.living_room.

A context object contains the following fields:

Field	Description
context_id	Unique identifier for the context.
user_id	Unique identifier of the user that started the change.
refresh_token_id	Unique identifier of the refresh token the user used to authenticate (in development)

Context is not stored in their own table in the database. Instead, each row in each table maintains it's own columns to store context.