I used to do Buteyko breathing exercises. The main idea is that over breathing results in a loss of co2 and less co2 in the body results in less oxygen being released from the blood due to the Bohr Effect https://en.wikipedia.org/wiki/Bohr_effect.
I drink kvass, a fermented beetroot drink and it has helped reduce abdominal pain that i occasionally get below my right rib after eating certain foods.
Business logic should sit in the domain model, but not the orm model. The domain model should be an object that is not coupled with the web framework. In the Clean Architecture approach this is called an Entity.
Something that amazes me about The Shroud of Turin is that if it was created in the 14th century, how did they create a photographic negative 400 years before the first known photographic negative was created in 1826 by Nicephore Niepce. It’s the most studied artifact in history and still no one knows how The Shroud was created.
Did you change the original paid app to the free/subscription model? How did the original users who paid for the app react to this? Considering to change one of my apps to a subscription model, but unsure if this is the best approach.