https://realpython.com/pipenv-guide/
https://realpython.com/python-data-classes/
https://docs.sqlalchemy.org/en/14/orm/session_basics.html
https://www.postgresql.org/docs/12/transaction-iso.html#XACT-REPEATABLE-READ
https://www.2ndquadrant.com/en/blog/postgresql-anti-patterns-read-modify-write-cycles/
https://www.cosmicpython.com/book/chapter_01_domain_model.html
https://github.com/cosmicpython/code/tree/chapter_01_domain_model
https://pypi.org/project/black/
https://www.systutorials.com/docs/linux/man/1-entr/
https://hynek.me/articles/hashes-and-equality/
https://www.youtube.com/watch?v=B48Exq57Zg8
https://www.youtube.com/watch?v=Ldlz4V-UCFw
https://www.youtube.com/watch?v=PBQN62oUnN8
http://www.peterprovost.org/blog/2012/05/02/kata-the-only-way-to-learn-tdd/