You’re putting first name and last name in the same column ?
I’d keep them in separate columns, and allow null for the first name if some people don’t provide it.
80 should be fine for each one of them, but frankly I’m just assuming…
It is default for most databases that I am aware of, and if you’re adding a column to a table that already has data in it, I don’t think you can do it any other way.
One thing to consider as a possibility is to create an Ignition User Source of Database type and point it to your database connection (probably make sure to customize the default prefix of scada_ to your needs). Then add a user through the Gateway web UI, and Ignition will automatically create tables like below (example is MariaDB):
One advantage to this is that you could use the Ignition functions (and components) for managing the user source. Just something to consider (if it happens to fit the need).