Fixes: 1) Corrected `ForeignKey` type assertions across models; 2) Resolved typos and formatting inconsistencies in `.env` and README; 3) Fixed explicit boolean checks in user manager methods.
Extra: Updated type hints in multiple models, serializers, and views.
Updated the log level from INFO to WARNING in the console production handler. This change aims to reduce log noise and surface only warnings and errors in production environments.
Change promotions to inactive instead of deleting them to maintain data integrity. Adjust Celery logging levels to be DEBUG/INFO based on the DEBUG setting, improving log granularity during development and clarity in production.
