Calendar platform: expose delete_event and update_event actions, include uid in get_events

[ragio579]

Feature request

The calendar platform currently only exposes calendar.create_event and calendar.get_events as actions. There is no way to programmatically delete or update calendar events.

The frontend can delete events via the WebSocket command calendar/event/delete, but this is not exposed as a service/action and is not accessible via the REST API.

Additionally, the calendar.get_events service (called via POST /api/services/calendar/get_events?return_response) does not return the uid field for events. However, the REST endpoint GET /api/calendars/<entity_id>?start=...&end=... does return uid. This inconsistency makes it impossible to identify events for deletion/update even if those actions existed.

Expected behavior

1. calendar.delete_event and calendar.update_event should be available as actions, accepting entity_id and uid (and updated fields for update).
2. calendar.get_events should return uid in its response, consistent with the REST GET endpoint.

Use case

I import work shifts from a Google Sheets document into a local_calendar via an n8n workflow. When shifts change, I need to clear the existing events for a given month and re-import them. Without delete_event as an action, the only workaround is directly manipulating the .ics file and reloading the integration — which is fragile and undocumented.

This would also benefit anyone using calendars as structured logs (e.g., logging appliance runs, doorbell events, cleaning sessions) who needs to clean up or correct entries programmatically.

Environment

• Home Assistant 2026.5+
• Affects at least: local_calendar, likely all calendar integrations that support the CalendarEntity methods

Originally filed as home-assistant/core#170251, redirected here as requested.