PostgreSQL is a better fit for large systems where IOPS speed is critical and also data needs to go through a more rigorous auth process. PostgreSQL also supports a number of performance boosters eg concurrency without read locks. PostgreSQL is also a better fit for data warehousing and data analysis systems.
PostgreSQL is the best choice and i would says the default database choice for many Python developers, including the Django team itself
I've always been passionate about knowing more about how #UX the products that I'm building and have used a bunch of session replay tools in the past, tools like Crazy Egg Hotjar Mixpanel but i am developing affinity for FullStory. I find searching for events to be effective and fast. i live the ability to see when users are frustrated and also skip inactivity, it's pretty intuitive.
I also feel that the creating funnels could be improved (like Mixpanel ) and also give recommendations about using your data tier more efficiently.