Fix a typo

beat/backend/python/dbexecution.py

@@ -157,7 +157,7 @@ class DBExecutor(object):
             db = database_cache[details['database']]
           else: #load it
             db = database.Database(self.prefix, details['database'],
-                    dataformat_cache)
+                    self.dataformat_cache)
             database_cache[db.name] = db
 
           self.databases[details['database']] = db