For many of us though, ignorance and fear are blocking factors. A company used a postgres safe migration gem that blocked default values with a not null constr

For many of us though, ignorance and fear are blocking factors. A company used a postgres safe migration gem that blocked default values with a not null constraint that became safe 3 years earlier, but 1) nobody questioned with the tool version changes 2) once you learn a constraint it's hard to forget it. With the add that you have to take time to upgrade the gem if you want to keep using it.