add user_id index to oauth collections
diff --git a/Allura/allura/model/oauth.py b/Allura/allura/model/oauth.py
index ce0baad..b7d539a 100644
--- a/Allura/allura/model/oauth.py
+++ b/Allura/allura/model/oauth.py
@@ -47,6 +47,9 @@
         session = main_orm_session
         name = 'oauth_token'
         unique_indexes = ['api_key']
+        indexes = [
+            ('user_id'),
+        ]
         polymorphic_on = 'type'
         polymorphic_identity = None