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Kegan Dougal
15c03b9689
This implements [MSC4242: State DAGs](https://github.com/matrix-org/matrix-spec-proposals/pull/4242), without support for federation. A general overview: - It adds a new room version and new event type. - It adds a new field `calculated_auth_event_ids` to internal metadata. - It stores the state DAG via new state DAG edges / forward extremities tables. - It adds new auth rules as per the MSC. - It uses the new `prev_state_events` field instead of `prev_event_ids()` when doing state resolution. Complement tests: https://github.com/matrix-org/complement/pull/841 ### Pull Request Checklist <!-- Please read https://element-hq.github.io/synapse/latest/development/contributing_guide.html before submitting your pull request --> * [x] Pull request is based on the develop branch * [x] Pull request includes a [changelog file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog). The entry should: - Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from `EventStore` to `EventWorkerStore`.". - Use markdown where necessary, mostly for `code blocks`. - End with either a period (.) or an exclamation mark (!). - Start with a capital letter. - Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry. * [x] [Code style](https://element-hq.github.io/synapse/latest/code_style.html) is correct (run the [linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters)) --------- Co-authored-by: Eric Eastwood <erice@element.io>