Backed out changeset 7a58581d842c
This changeset breaks a number of CW tests, which depends on pre add hooks. I'm
backing it out, so that we can start the need-for-speed sprint with green tests
(and possibly rework this changeset)
if repo.system_source.dbdriver == 'postgres':
sql('ALTER TABLE appears ADD COLUMN weight float')
sql('UPDATE appears SET weight=1.0 ')