src/main.cr, you can require and initialize Clear:
require "clear"load the source code of Clear and provide everything needed to use the library.
Clear::SQL.initprepare a certain number of connection to your database. The URL is a convention used to connect to the database, and follow this schema:
connection_pool_size: 5is optional but offers the possibility to concurrent fibers to run query at the same time. It's useful if you use an event-driven server, like Kemal.