Change registry code to disconnect from the DB before long I/O operations

data/database.py

@@ -35,6 +35,22 @@ class CallableProxy(Proxy):
       raise AttributeError('Cannot use uninitialized Proxy.')
     return self.obj(*args, **kwargs)
 
+
+class CloseForLongOperation(object):
+  """ Helper object which disconnects the database then reconnects after the nested operation
+      completes.
+  """
+
+  def __init__(self, config_object):
+    self.config_object = config_object
+
+  def __enter__(self):
+    close_db_filter(None)
+
+  def __exit__(self, type, value, traceback):
+    configure(self.config_object)
+
+
 class UseThenDisconnect(object):
   """ Helper object for conducting work with a database and then tearing it down. """
 
@@ -69,6 +85,7 @@ def _db_from_url(url, db_kwargs):
 
 
 def configure(config_object):
+  logger.debug('Configuring database')
   db_kwargs = dict(config_object['DB_CONNECTION_ARGS'])
   write_db_uri = config_object['DB_URI']
   db.initialize(_db_from_url(write_db_uri, db_kwargs))