Initializes the User model and attaches it to the exported db object.Connects to the API database with the Sequelize ORM.Connects to MySQL db server using the mysql2 db client and executes a query to create the API database if it doesn't already exist.The initialize() function is executed once on API startup and performs the following actions: The DB wrapper uses mysql2 directly to connect to MySQL and create the database if it doesn't exist. MySQL2 is the MySQL connector library used by Sequelize to connect to the MySQL db server.
It exports an object that exposes all of the database models for the application (currently only User), and provides an easy way to access any part of the database from a single point. The MySQL database wrapper connects to MySQL using Sequelize & the mysql2 library.
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