--- a/script/lib/iri_tweet/models.py	Wed Dec 14 18:22:27 2011 +0100
+++ b/script/lib/iri_tweet/models.py	Wed Dec 14 18:23:08 2011 +0100
@@ -152,7 +152,7 @@
     id = Column(BigInteger, primary_key=True, autoincrement=False)
     id_str = Column(String)
     contributors_enabled = Column(Boolean)
-    created_at = Column(DateTime)
+    created_at = Column(DateTime, index=True)
     description = Column(String)
     favourites_count = Column(Integer)
     follow_request_sent = Column(Boolean)