[user_im_prefs__keys]
user_id = K
transport = K
-transport = U
-screenname = U
+; There's another unique index on (transport, screenname)
+; but we have no way to represent a compound index other than
+; the primary key in here. To ensure proper cache purging,
+; we need to tweak the class.
[user_urlshortener_prefs]
user_id = 129