Current version of application is using Entity Framework Core to access SQL Server database. EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations. EF Core works with SQL Server, Azure SQL Database, SQLite, Azure Cosmos DB, MySQL, PostgreSQL, and other databases through a provider plugin API.
In this module you are going to make appropriate code changes to switch from SQL Server to PostgreSQL.