HACK: Consider @fs_.+ as a appservice

Author: sandhose

crates/syn2mas/src/migration.rs

@@ -929,11 +929,12 @@ fn transform_user(
 fn is_likely_appservice(localpart: &str) -> bool {
     // HACK(matrix.org): These are the namespaces we use on matrix.org
     localpart.starts_with('_')
-        || localpart.starts_with("freenode_")
-        || localpart.starts_with("slack_")
-        || localpart.starts_with("torn_")
-        || localpart.starts_with("gitter_")
-        || localpart.starts_with("mozilla_")
+        || localpart.starts_with("freenode_") // Freenode IRC bridge
+        || localpart.starts_with("slack_") // Slack bridge
+        || localpart.starts_with("torn_") // Torn IRC bridge
+        || localpart.starts_with("gitter_") // Gitter bridge
+        || localpart.starts_with("mozilla_") // Mozilla IRC bridge
+        || localpart.starts_with("fs_") // VoIP conference AS
         // HACK(matrix.org): Sender localparts of those appservices
         || localpart == "bifrost"
         || localpart == "appservice-irc"