title: Limit the number of rows in a room database
body: <p>How can I limit the number of rows in an Android room database by removing the oldest item in the row and inserting the newest one?</p>
  <p>I am guessing its a standard query when adding an item to the database?</p>
  <p><strong>EDIT</strong>: I want to limit a database table to have a max row count of say 20. If that limit is reached, we remove the oldest item and insert the new one by keeping the current row count to 20.</p>