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Avoid re-computing the event ID when cloning events.#19527

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quenting/clone-event-copy-event-id
Mar 12, 2026
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Avoid re-computing the event ID when cloning events.#19527
sandhose merged 2 commits into
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quenting/clone-event-copy-event-id

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@sandhose sandhose commented Mar 4, 2026

event_id is a lazily-computed property on events, as it's a hash of the event content on room version 3 and later. The reason we do this is that it helps finding database inconsistencies by not trusting the event ID we got from the database.

The thing is, when we clone events (to return them through /sync or /messages for example) we don't copy the computed hash if we already computed it, duplicating the work. This copies the internal _event_id property.

@sandhose sandhose marked this pull request as ready for review March 4, 2026 10:43
@sandhose sandhose requested a review from a team as a code owner March 4, 2026 10:43
@sandhose sandhose added the Z-Deployed-On-Morg This PR has been deployed on matrix.org, so we must either merge it soon or roll it back label Mar 5, 2026
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Nice find!

@sandhose sandhose merged commit 8d03a4d into develop Mar 12, 2026
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@sandhose sandhose deleted the quenting/clone-event-copy-event-id branch March 12, 2026 14:17
alexlebens pushed a commit to alexlebens/infrastructure that referenced this pull request Mar 24, 2026
This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [element-hq/synapse](https://github.com/element-hq/synapse) | minor | `v1.149.1` → `v1.150.0` |

---

### Release Notes

<details>
<summary>element-hq/synapse (element-hq/synapse)</summary>

### [`v1.150.0`](https://github.com/element-hq/synapse/releases/tag/v1.150.0)

[Compare Source](element-hq/synapse@v1.149.1...v1.150.0)

### Synapse 1.150.0 (2026-03-24)

No significant changes since 1.150.0rc1.

### Synapse 1.150.0rc1 (2026-03-17)

#### Features

- Add experimental support for the [MSC4370](matrix-org/matrix-spec-proposals#4370) Federation API `GET /extremities` endpoint. ([#&#8203;19314](element-hq/synapse#19314))
- [MSC4140: Cancellable delayed events](matrix-org/matrix-spec-proposals#4140): When persisting a delayed event to the timeline, include its `delay_id` in the event's `unsigned` section in `/sync` responses to the event sender. ([#&#8203;19479](element-hq/synapse#19479))
- Expose [MSC4354 Sticky Events](matrix-org/matrix-spec-proposals#4354) over the legacy (v3) /sync API. ([#&#8203;19487](element-hq/synapse#19487))
- When Matrix Authentication Service (MAS) integration is enabled, allow MAS to set the user locked status in Synapse. ([#&#8203;19554](element-hq/synapse#19554))

#### Bugfixes

- Fix `Build and push complement image` CI job pointing to non-existent image. ([#&#8203;19523](element-hq/synapse#19523))
- Fix a bug introduced in v1.26.0 that caused deactivated, erased users to not be removed from the user directory. ([#&#8203;19542](element-hq/synapse#19542))

#### Improved Documentation

- In the Admin API documentation, always express path parameters as `/<param>` instead of as `/$param`. ([#&#8203;19307](element-hq/synapse#19307))
- Update docs to clarify `outbound_federation_restricted_to` can also be used with the [Secure Border Gateway (SBG)](https://element.io/en/server-suite/secure-border-gateways). ([#&#8203;19517](element-hq/synapse#19517))
- Unify Complement developer docs. ([#&#8203;19518](element-hq/synapse#19518))

#### Internal Changes

- Put membership updates in a background resumable task when changing the avatar or the display name. ([#&#8203;19311](element-hq/synapse#19311))
- Add in-repo Complement test to sanity check Synapse version matches git checkout (testing what we think we are). ([#&#8203;19476](element-hq/synapse#19476))
- Migrate `dev` dependencies to [PEP 735](https://peps.python.org/pep-0735/) dependency groups. ([#&#8203;19490](element-hq/synapse#19490))
- Remove the optional `systemd-python` dependency and the `systemd` extra on the `synapse` package. ([#&#8203;19491](element-hq/synapse#19491))
- Avoid re-computing the event ID when cloning events. ([#&#8203;19527](element-hq/synapse#19527))
- Allow caching of the `/versions` and `/auth_metadata` public endpoints. ([#&#8203;19530](element-hq/synapse#19530))
- Add a few labels to the number groupings in the `Processed request` logs. ([#&#8203;19548](element-hq/synapse#19548))

</details>

---

### Configuration

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🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

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---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My44NC4yIiwidXBkYXRlZEluVmVyIjoiNDMuODQuMiIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiaW1hZ2UiXX0=-->

Reviewed-on: https://gitea.alexlebens.dev/alexlebens/infrastructure/pulls/5040
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>
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