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@@ -101,7 +101,7 @@
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
             <div class="sidebar-scrollbox">
-                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="upgrade.html">Upgrading 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rules callbacks</a></li><li class="chapter-item expanded "><a href="modules/presence_router_callbacks.html">Presence router callbacks</a></li><li class="chapter-item expanded "><a href="modules/account_validity_callbacks.html">Account validity callbacks</a></li><li class="chapter-item expanded "><a href="modules/password_auth_provider_callbacks.html">Password auth provider callbacks</a></li><li class="chapter-item expanded "><a href="modules/background_update_controller_callbacks.html">Background update controller callbacks</a></li><li class="chapter-item expanded "><a href="modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a 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href="metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><a href="usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a href="usage/administration/database_maintenance_tools.html">Database Maintenance Tools</a></li><li class="chapter-item expanded "><a href="usage/administration/state_groups.html">State Groups</a></li><li class="chapter-item expanded "><a href="usage/administration/request_log.html">Request log format</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a 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class="chapter-item expanded "><a href="replication.html">Replication</a></li><li class="chapter-item expanded "><a href="tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="upgrade.html">Upgrading 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expanded "><a href="application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="development/url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a href="user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="modules/index.html">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/writing_a_module.html">Writing a module</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/spam_checker_callbacks.html">Spam checker callbacks</a></li><li class="chapter-item expanded "><a href="modules/third_party_rules_callbacks.html">Third-party rules callbacks</a></li><li class="chapter-item expanded "><a href="modules/presence_router_callbacks.html">Presence router callbacks</a></li><li class="chapter-item expanded "><a href="modules/account_validity_callbacks.html">Account validity callbacks</a></li><li class="chapter-item expanded "><a href="modules/password_auth_provider_callbacks.html">Password auth provider callbacks</a></li><li class="chapter-item expanded "><a href="modules/background_update_controller_callbacks.html">Background update controller callbacks</a></li><li class="chapter-item expanded "><a href="modules/account_data_callbacks.html">Account data callbacks</a></li><li class="chapter-item expanded "><a href="modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="synctl_workers.html">Using synctl with 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class="chapter-item expanded "><a href="metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><a href="usage/administration/understanding_synapse_through_grafana_graphs.html">Understanding Synapse Through Grafana Graphs</a></li><li class="chapter-item expanded "><a href="usage/administration/useful_sql_for_admins.html">Useful SQL for Admins</a></li><li class="chapter-item expanded "><a href="usage/administration/database_maintenance_tools.html">Database Maintenance Tools</a></li><li class="chapter-item expanded "><a href="usage/administration/state_groups.html">State Groups</a></li><li class="chapter-item expanded "><a href="usage/administration/request_log.html">Request log format</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_faq.html">Admin FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a 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class="chapter-item expanded "><a href="replication.html">Replication</a></li><li class="chapter-item expanded "><a href="tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a href="development/room-dag-concepts.html">Room DAG concepts</a></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
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@@ -8014,7 +8014,7 @@ multiple modules implement it.</p>
 <h2 id="handling-the-modules-configuration"><a class="header" href="#handling-the-modules-configuration">Handling the module's configuration</a></h2>
 <p>A module can implement the following static method:</p>
 <pre><code class="language-python">@staticmethod
-def parse_config(config: dict) -&gt; dict
+def parse_config(config: dict) -&gt; Any
 </code></pre>
 <p>This method is given a dictionary resulting from parsing the YAML configuration for the
 module. It may modify it (for example by parsing durations expressed as strings (e.g.
@@ -8888,6 +8888,97 @@ of the database. The module must return an integer representing the minimum numb
 elements to process in this iteration. This number must be at least 1, and is used to
 ensure that progress is always made.</p>
 <p>If this callback is not defined, Synapse will use a default value of 100.</p>
+<div id="chapter_begin" style="break-before: page; page-break-before: always;"></div><h1 id="account-data-callbacks"><a class="header" href="#account-data-callbacks">Account data callbacks</a></h1>
+<p>Account data callbacks allow module developers to react to changes of the account data
+of local users. Account data callbacks can be registered using the module API's
+<code>register_account_data_callbacks</code> method.</p>
+<h2 id="callbacks-4"><a class="header" href="#callbacks-4">Callbacks</a></h2>
+<p>The available account data callbacks are:</p>
+<h3 id="on_account_data_updated"><a class="header" href="#on_account_data_updated"><code>on_account_data_updated</code></a></h3>
+<p><em>First introduced in Synapse v1.57.0</em></p>
+<pre><code class="language-python">async def on_account_data_updated(
+    user_id: str,
+    room_id: Optional[str],
+    account_data_type: str,
+    content: &quot;synapse.module_api.JsonDict&quot;,
+) -&gt; None:
+</code></pre>
+<p>Called after user's account data has been updated. The module is given the
+Matrix ID of the user whose account data is changing, the room ID the data is associated
+with, the type associated with the change, as well as the new content. If the account
+data is not associated with a specific room, then the room ID is <code>None</code>.</p>
+<p>This callback is triggered when new account data is added or when the data associated with
+a given type (and optionally room) changes. This includes deletion, since in Matrix,
+deleting account data consists of replacing the data associated with a given type
+(and optionally room) with an empty dictionary (<code>{}</code>).</p>
+<p>Note that this doesn't trigger when changing the tags associated with a room, as these are
+processed separately by Synapse.</p>
+<p>If multiple modules implement this callback, Synapse runs them all in order.</p>
+<h2 id="example-4"><a class="header" href="#example-4">Example</a></h2>
+<p>The example below is a module that implements the <code>on_account_data_updated</code> callback, and
+sends an event to an audit room when a user changes their account data.</p>
+<pre><code class="language-python">import json
+import attr
+from typing import Any, Dict, Optional
+
+from synapse.module_api import JsonDict, ModuleApi
+from synapse.module_api.errors import ConfigError
+
+
+@attr.s(auto_attribs=True)
+class CustomAccountDataConfig:
+    audit_room: str
+    sender: str
+
+
+class CustomAccountDataModule:
+    def __init__(self, config: CustomAccountDataConfig, api: ModuleApi):
+        self.api = api
+        self.config = config
+
+        self.api.register_account_data_callbacks(
+            on_account_data_updated=self.log_new_account_data,
+        )
+
+    @staticmethod
+    def parse_config(config: Dict[str, Any]) -&gt; CustomAccountDataConfig:
+        def check_in_config(param: str):
+            if param not in config:
+                raise ConfigError(f&quot;'{param}' is required&quot;)
+
+        check_in_config(&quot;audit_room&quot;)
+        check_in_config(&quot;sender&quot;)
+
+        return CustomAccountDataConfig(
+            audit_room=config[&quot;audit_room&quot;],
+            sender=config[&quot;sender&quot;],
+        )
+
+    async def log_new_account_data(
+        self,
+        user_id: str,
+        room_id: Optional[str],
+        account_data_type: str,
+        content: JsonDict,
+    ) -&gt; None:
+        content_raw = json.dumps(content)
+        msg_content = f&quot;{user_id} has changed their account data for type {account_data_type} to: {content_raw}&quot;
+
+        if room_id is not None:
+            msg_content += f&quot; (in room {room_id})&quot;
+
+        await self.api.create_and_send_event_into_room(
+            {
+                &quot;room_id&quot;: self.config.audit_room,
+                &quot;sender&quot;: self.config.sender,
+                &quot;type&quot;: &quot;m.room.message&quot;,
+                &quot;content&quot;: {
+                    &quot;msgtype&quot;: &quot;m.text&quot;,
+                    &quot;body&quot;: msg_content
+                }
+            }
+        )
+</code></pre>
 <div id="chapter_begin" style="break-before: page; page-break-before: always;"></div><h1 id="porting-an-existing-module-that-uses-the-old-interface"><a class="header" href="#porting-an-existing-module-that-uses-the-old-interface">Porting an existing module that uses the old interface</a></h1>
 <p>In order to port a module that uses Synapse's old module interface, its author needs to:</p>
 <ul>
@@ -14506,7 +14597,7 @@ connection errors.</p>
 received for each stream so that on reconneciton it can start streaming
 from the correct place. Note: not all RDATA have valid tokens due to
 batching. See <code>RdataCommand</code> for more details.</p>
-<h3 id="example-4"><a class="header" href="#example-4">Example</a></h3>
+<h3 id="example-5"><a class="header" href="#example-5">Example</a></h3>
 <p>An example iteraction is shown below. Each line is prefixed with '&gt;'
 or '&lt;' to indicate which side is sending, these are <em>not</em> included on
 the wire:</p>
@@ -14838,7 +14929,7 @@ graph), and one where we remove redundant links (the transitive reduction of the
 links graph) e.g. if we have chains <code>C3 -&gt; C2 -&gt; C1</code> then the link <code>C3 -&gt; C1</code>
 would not be stored. Synapse uses the former implementations so that it doesn't
 need to recurse to test reachability between chains.</p>
-<h3 id="example-5"><a class="header" href="#example-5">Example</a></h3>
+<h3 id="example-6"><a class="header" href="#example-6">Example</a></h3>
 <p>An example auth graph would look like the following, where chains have been
 formed based on type/state_key and are denoted by colour and are labelled with
 <code>(chain ID, sequence number)</code>. Links are denoted by the arrows (links in grey