A few basics:

• Use a config file. This database login stuff does not belong in your application code.
• Don't write your own HTML escaping code. Use CGI or HTML::Entities.
• Use templating to get the HTML out of your code.
• Use CGI::Application or something similar to get rid of that if/elsif tree for $action.
• Turn RaiseError on for DBI.

Also, if you want detailed responses, post less code. It would take hours to go through this code carefully.

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