if the kids distract me when I'm in the middle of something, a certain amount of cursing might happen

That certain amount must be a rather fun one knowing his insulting prowess

I think this timestamp-as-a-boolean is a good idea if the field is always going to be interpreted as either True or False and nothing more. If the field in question allows for a 3rd (uncertain) value, then using a timestamp would be extremely confusing.

Would you be so kind as to recommend some resources about caching? I've read the basics, but have yet to dive deep on it