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# What does this implement/fix? The queue session id that builds and validates stream URLs was carried in `PlayerMedia.custom_data`, which is serialized to API clients. It is server-internal bookkeeping, so it now travels in a field that stays out of the payload. The command route (used by Chromecast so the on-device next button works during a flow stream) accepted any caller that knew a queue id. It now requires the queue's current playback session, like the other stream routes already do. **Related issue (if applicable):** - n/a ## Types of changes - [ ] Bugfix (non-breaking change which fixes an issue) — `bugfix` - [ ] New feature (non-breaking change which adds functionality) — `new-feature` - [ ] Enhancement to an existing feature — `enhancement` - [ ] New music/player/metadata/plugin provider — `new-provider` - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected) — `breaking-change` - [ ] Refactor (no behaviour change) — `refactor` - [ ] Documentation only — `documentation` - [x] Maintenance / chore — `maintenance` - [ ] CI / workflow change — `ci` - [ ] Dependencies bump — `dependencies` ## Checklist - [x] The code change is tested and works locally. - [x] `pre-commit run --all-files` passes. - [x] `pytest` passes, and tests have been added/updated under `tests/` where applicable. - [x] For changes to shared models, the companion PR in `music-assistant/models` is linked. - [ ] For changes affecting the UI, the companion PR in `music-assistant/frontend` is linked. - [x] I have read and complied with the project's [AI Policy](https://github.com/music-assistant/.github/blob/main/AI_POLICY.md) for any AI-assisted contributions. - [ ] I have [raised a PR against the documentation repository](https://github.com/music-assistant/music-assistant.io/blob/main/CONTRIBUTING.md) targeting the main or beta branch as appropriate. --- Needs models https://github.com/music-assistant/models/pull/366 released first (adds the `queue_session_id` field); kept as draft until then.