Buffer backup upload progress events

[zweckj]

Breaking change

Proposed change

For the upload progress validation during backup buffer the progress events so we don't flood the websocket with messages for large backups with multiple different backup targets.
Additionally, don't let the coordinator refresh for progress events, it does not need to know about those state changes, only when the upload starts and completes.

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• Dependency upgrade
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• Code quality improvements to existing code or addition of tests

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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (backup) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

This PR adds throttling for backup upload progress events to prevent flooding the WebSocket with messages during large backups targeting multiple agents. Additionally, the backup coordinator is updated to skip async_refresh() for upload progress events since the coordinator doesn't need to react to intermediate progress updates.

Changes:

• Buffer UploadBackupEvent instances in the backup manager, sending the first event immediately and then flushing buffered events at most once per second (per agent, keeping only the latest)
• Skip coordinator refresh for UploadBackupEvent in BackupDataUpdateCoordinator._on_event
• Add three new tests covering throttling behavior, flush-on-state-change, and coordinator skip logic

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
homeassistant/components/backup/manager.py	Adds upload progress throttling: buffers UploadBackupEvents keyed by agent_id, flushes immediately on first event, then on a 1-second timer, and flushes all pending events before any non-upload event
homeassistant/components/backup/coordinator.py	Skips async_refresh() when the coordinator receives an UploadBackupEvent
tests/components/backup/test_manager.py	Adds tests for throttling, flush-on-state-change, and coordinator skip behavior

[MartinHjelmare]

Nice!

[MartinHjelmare]

Great!

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.