should we make it clearer how to browse the db?

[maubinle]

It just took me an embarrassing amount of time to figure out how to browse all the db tables using a postgres client. I don't think the current check included in instructions (to run psql -d sidewalk and \du) is quite enough to get new users fully set up to query the db whenever they need to. I'm wondering if it's perhaps a good idea to include specific instructions on how to use the postgres client to query for adhoc data. For example, just check that you are able to run a simple query (e.g. 'SELECT * FROM webpage_activity LIMIT 100;) to make sure you're fully set up. I think this would be simple to write up and would help to confirm that the installation has succeeded -- happy to do this if it seems helpful.

However, I'm not sure how much of this changes as a result of using docker... perhaps this will be easier then? Should I still add this step to the instructions?