Hi @drueda,
Hmm, your PostgreSQL is being extremely picky – I wonder if you’re not using an especially pedantic version of it? You may need to quote the 1, i.e. ps.setting_value='1'. If you have some SQL skills, please experiment with this further – it’s slow and error-prone for me to do so remotely 
Regards,
Alec Smecher
Public Knowledge Project Team