update the migration of users and topics to better represent the property of their columns;
update model of topics to include concerns count;
update model of concerns to declare its relation with users and topics, and also to append the location property;
update model of reviews to declare its relation with users and topics, and also to append the location property and add votes count;
update model of concerns to declare its relation with users and reviews;
update seeder of concerns to truncate the table and auto generate dummy data to it;
update seeder of reviews to truncate the table and auto generate dummy data to it;
update seeder of votes to truncate the table and auto generate dummy data to it;
implement all seeders and add a timer for the seeding process;