💬 Better error messages for makefile

[tallys]

Common error could use the following error message:

"Your database isn't set up - run make migrate"

[tshelburne]

Need to do a brief review for other good errors to cover - in general, we really shouldn't be having "random failures"

[tshelburne]

Also, bit of background - when the database isn't migrated, we get an "Unexpected failure" message that is entirely unhelpful.