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Fixes: #19540 Fixes: #16290 (side effect of the proposed fix) Closes: #12804 (side effect of the proposed fix) Introduced in: https://github.com/matrix-org/synapse/pull/8932 --- This PR is a relatively simple simplification of the profile change on deactivation that appears to remove multiple bugs. This PR's **primary motivating fix** is #19540: when a user is deactivated and erased, they would be kept in the user directory. This bug appears to have been here since #8932 (previously https://github.com/matrix-org/synapse/pull/8932) (v1.26.0). The root cause of this bug is that after removing the user from the user directory, we would immediately update their displayname and avatar to empty strings (one at a time), which re-inserts the user into the user directory. With this PR, we now delete the entire `profiles` row upon user erasure, which is cleaner (from a 'your database goes back to zero after deactivating and erasing a user' point of view) and only needs one database operation (instead of doing displayname then avatar). With this PR, we also no longer send the 2 (deferred) `m.room.member` `join` events to every room to propagate the displayname and avatar_url changes. This is good for two reasons: - the user is about to get parted from those rooms anyway, so this reduces the number of state events sent per room from 3 to 1. (More efficient for us in the moment and leaves less litter in the room DAG.) - it is possible for the displayname/avatar update to be sent **after** the user parting, which seems as though it could trigger the user to be re-joined to a public room. (With that said, although this sounds vaguely familiar in my lossy memory, I can't find a ticket that actually describes this bug, so this might be fictional. Edit: #16290 seems to describe this, although the title is misleading.) Additionally, as a side effect of the proposed fix (deleting the `profiles` row), this PR also now deletes custom profile fields upon user erasure, which is a new feature/bugfix (not sure which) in its own right. I do not see a ticket that corresponds to this feature gap, possibly because custom profile fields are still a niche feature without mainstream support (to the best of my knowledge). Tests are included for the primary bugfix and for the cleanup of custom profile fields. ### `set_displayname` module API change This change includes a minor _technically_-breaking change to the module API. The change concerns `set_displayname` which is exposed to the module API with a `deactivation: bool = False` flag, matching the internal handler method it wraps. I suspect that this is a mistake caused by overly-faithfully piping through the args from the wrapped method (this Module API was introduced in https://github.com/matrix-org/synapse/pull/14629/changes#diff-0b449f6f95672437cf04f0b5512572b4a6a729d2759c438b7c206ea249619885R1592). The linked PR did the same for `by_admin` originally before it was changed. The `deactivation` flag's only purpose is to be piped through to other Module API callbacks when a module has registered to be notified about profile changes. My claim is that it makes no sense for the Module API to have this flag because it is not the one doing the deactivation, thus it should never be in a position to set this to `True`. My proposed change keeps the flag (for function signature compatibility), but turns it into a no-op (with a `ERROR` log when it's set to True by the module). The Module API callback notifying of the module-caused displayname change will therefore now always have `deactivation = False`. *Discussed in [`#synapse-dev:matrix.org`](https://matrix.to/#/!i5D5LLct_DYG-4hQprLzrxdbZ580U9UB6AEgFnk6rZQ/$1f8N6G_EJUI_I_LvplnVAF2UFZTw_FzgsPfB6pbcPKk?via=element.io&via=matrix.org&via=beeper.com)* --------- Signed-off-by: Olivier 'reivilibre <oliverw@matrix.org>