Fix the trigger delete code and enable peewee autorollback.

config.py

@@ -47,7 +47,8 @@ class RealTransactions(object):
 class SQLiteDB(RealTransactions):
   DB_NAME = 'test/data/test.db'
   DB_CONNECTION_ARGS = {
-    'threadlocals': True
+    'threadlocals': True,
+    'autorollback': True,
   }
   DB_DRIVER = SqliteDatabase
 
@@ -79,6 +80,7 @@ class RDSMySQL(RealTransactions):
     'user': 'fluxmonkey',
     'passwd': '8eifM#uoZ85xqC^',
     'threadlocals': True,
+    'autorollback': True,
   }
   DB_DRIVER = MySQLDatabase