[performance] preseed ANALYZE data in the db

I wonder if we should rationalize all these numbers.  When someone goes to add a new table, they won't have the device with the same data set, so they will have to make up equivalent numbers (or probably, derive appropriate-looking numbers by inspecting the table on their own device).  We could instead change all numbers here to whichever is the nearest of  1, 10, 100, 1000, etc.