Add ability for triggers to be disabled

Will be used in the followup commit to automatically disable broken triggers

data/migrations/versions/a6c463dfb9fe_back_fill_build_expand_config.py

@@ -10,7 +10,8 @@ Create Date: 2017-03-17 10:00:19.739858
 import json
 import os
 
-from data.database import RepositoryBuildTrigger
+from peewee import *
+from data.database import BaseModel
 
 revision = 'a6c463dfb9fe'
 down_revision = 'b4df55dea4b3'
@@ -18,6 +19,9 @@ down_revision = 'b4df55dea4b3'
 from alembic import op
 
 
+class RepositoryBuildTrigger(BaseModel):
+  config = TextField(default='{}')
+
 def upgrade(tables):
   repostioryBuildTriggers = RepositoryBuildTrigger.select()
   for repositoryBuildTrigger in repostioryBuildTriggers: