I really like the MathMajor channel too but for the moment it's very Abstract Algebra centric. For those of you who speak French I can also recommend https://m.youtube.com/@MathsAdultes with videos made by a teacher whose students are future Maths teachers and cover a broad variety of topics like Series, Number theory, Measure theory (from Lebesgue to the dominated converge theroem),...
The latest videos are about Topology.
You don't have to put all the tables in a single monstrous diagram.
Tools will probably generate those but I usually provides several simpler ones in the documentation offering several perspectives e.g. authentication, acl/rbac,...
I worked on an application that helps prevent train collisions.
And another application to detect faulty doors on older trains to prevent passenger accidents.
I worked almost 10 years doing PHP.
Only corporate apps (backoffices/frontoffices/services/batches, monitoring CO2 for train transports, GPS , invoices, train orders, electronic consignment notes ,sso&subscriber management for a magazine, bridges... ), not a single WordPress.
So at some point there were PHP developers and I met many. I lost interest in PHP when the industry moved to REST APIs and SPA though.