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People keep asking why their database hasn't gotten smaller after using this API. Signed-off-by: Aaron Raimist <aaron@raim.ist>
71 lines
2 KiB
ReStructuredText
71 lines
2 KiB
ReStructuredText
Purge History API
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=================
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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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The API is:
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``POST /_matrix/client/r0/admin/purge_history/<room_id>[/<event_id>]``
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including an ``access_token`` of a server admin.
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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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.. code:: json
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{
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"delete_local_events": true
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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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.. code:: json
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{
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"purge_id": "<opaque id>"
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}
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Purge status query
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------------------
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It is possible to poll for updates on recent purges with a second API;
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``GET /_matrix/client/r0/admin/purge_history_status/<purge_id>``
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(again, with a suitable ``access_token``). This API returns a JSON body like
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the following:
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.. code:: json
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{
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"status": "active"
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}
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The status will be one of ``active``, ``complete``, or ``failed``.
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Reclaim disk space (Postgres)
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-----------------------------
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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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