
MySQL tables
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Users
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Contains a list of users, email addresses, names and other attributes.

Newletters
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The newsletters that will be sent, description, Welcome message

Subscribers
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List which users are subscribed to which newsletters.

Messages
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Each Message that has been created, message id and message body.

Queue
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A list of message ids and list ids, Sent flag.

Processed
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List of each message sent to a list and to a user.

