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<h1 id="purge-history-api"><a class="header" href="#purge-history-api">Purge History API</a></h1>
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<p>The purge history API allows server admins to purge historic events from their
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database, reclaiming disk space.</p>
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<p>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.</p>
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<p>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.</p>
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<p>The API is:</p>
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<pre><code>POST /_synapse/admin/v1/purge_history/<room_id>[/<event_id>]
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</code></pre>
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<p>To use it, you will need to authenticate by providing an <code>access_token</code> for a
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server admin: <a href="../usage/administration/admin_api">Admin API</a></p>
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<p>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.)</p>
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<p>Room state data (such as joins, leaves, topic) is always preserved.</p>
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<p>To delete local message events as well, set <code>delete_local_events</code> in the body:</p>
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<pre><code class="language-json">{
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"delete_local_events": true
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}
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</code></pre>
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<p>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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<code>purge_up_to_event_id</code> or <code>purge_up_to_ts</code> 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 <code>purge_up_to_ts</code> is given, it should be a timestamp since the unix epoch,
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in milliseconds.</p>
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<p>The API starts the purge running, and returns immediately with a JSON body with
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a purge id:</p>
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<pre><code class="language-json">{
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"purge_id": "<opaque id>"
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}
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</code></pre>
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<h2 id="purge-status-query"><a class="header" href="#purge-status-query">Purge status query</a></h2>
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<p>It is possible to poll for updates on recent purges with a second API;</p>
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<pre><code>GET /_synapse/admin/v1/purge_history_status/<purge_id>
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</code></pre>
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<p>Again, you will need to authenticate by providing an <code>access_token</code> for a
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server admin.</p>
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<p>This API returns a JSON body like the following:</p>
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<pre><code class="language-json">{
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"status": "active"
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}
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</code></pre>
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<p>The status will be one of <code>active</code>, <code>complete</code>, or <code>failed</code>.</p>
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<p>If <code>status</code> is <code>failed</code> there will be a string <code>error</code> with the error message.</p>
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<h2 id="reclaim-disk-space-postgres"><a class="header" href="#reclaim-disk-space-postgres">Reclaim disk space (Postgres)</a></h2>
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<p>To reclaim the disk space and return it to the operating system, you need to run
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<code>VACUUM FULL;</code> on the database.</p>
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<p><a href="https://www.postgresql.org/docs/current/sql-vacuum.html">https://www.postgresql.org/docs/current/sql-vacuum.html</a></p>
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