Semicolon

I am new to ruby on rails, can please guide me, when I run migration my schema.rb has a character set = latin1, I wanted it to be utf8mb4, how to set this by default.

Can I know when I run "rails db:migrate" its updating mysql and schema but not in migration folder files. Also "rails db:migrate VERSION=0" is not working...

Thankyou verymuch Chris Oliver

When I run rails db:migration

it works but there will warnings like below..

/home/paritech/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.1/lib/active_record/connection_adapters/mysql/schema_statements.rb:158: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/home/paritech/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.1/lib/active_record/connection_adapters/abstract/schema_definitions.rb:260: warning: The called method `initialize' is defined here