81 lines
2.2 KiB
Markdown
81 lines
2.2 KiB
Markdown
# Purge History API
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The purge history API allows server admins to purge historic events from their
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database, reclaiming disk space.
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Depending on the amount of history being purged a call to the API may take
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several minutes or longer. During this period users will not be able to
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paginate further back in the room from the point being purged from.
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Note that Synapse requires at least one message in each room, so it will never
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delete the last message in a room.
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The API is:
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```
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POST /_synapse/admin/v1/purge_history/<room_id>[/<event_id>]
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```
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To use it, you will need to authenticate by providing an `access_token` for a
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server admin: [Admin API](../usage/administration/admin_api)
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By default, events sent by local users are not deleted, as they may represent
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the only copies of this content in existence. (Events sent by remote users are
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deleted.)
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Room state data (such as joins, leaves, topic) is always preserved.
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To delete local message events as well, set `delete_local_events` in the body:
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```json
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{
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"delete_local_events": true
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}
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```
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The caller must specify the point in the room to purge up to. This can be
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specified by including an event_id in the URI, or by setting a
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`purge_up_to_event_id` or `purge_up_to_ts` in the request body. If an event
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id is given, that event (and others at the same graph depth) will be retained.
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If `purge_up_to_ts` is given, it should be a timestamp since the unix epoch,
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in milliseconds.
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The API starts the purge running, and returns immediately with a JSON body with
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a purge id:
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```json
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{
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"purge_id": "<opaque id>"
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}
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```
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## Purge status query
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It is possible to poll for updates on recent purges with a second API;
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```
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GET /_synapse/admin/v1/purge_history_status/<purge_id>
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```
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Again, you will need to authenticate by providing an `access_token` for a
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server admin.
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This API returns a JSON body like the following:
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```json
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{
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"status": "active"
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}
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```
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The status will be one of `active`, `complete`, or `failed`.
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If `status` is `failed` there will be a string `error` with the error message.
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## Reclaim disk space (Postgres)
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To reclaim the disk space and return it to the operating system, you need to run
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`VACUUM FULL;` on the database.
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<https://www.postgresql.org/docs/current/sql-vacuum.html>
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