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I know that Loader::db() has been replaced with Database::connection();
From the migration guide:
"Use PHP Namespacing instead of Loader functions
Concrete5.7 introduces the use of php namespaces in lieu of the various Loader::xxxxx() functions (e.g. Loader::model(), Loader::library(), etc.)"
https://github.com/concrete5/concrete5/wiki/Migration-Guide#use-php-...