I suggested persistence because it is broader than databases, and more likely to "deserve" a forum.
According to Wikipedia,
In programming, persistence refers specifically to the ability to retain data structures between program executions, such as, for example, an image editing program saving complex selections or a word processor saving undo history.
This is achieved in practice by storing the data in non-volatile storage such as a file system or a relational database or an object database.
I think it may be a big enough topic (may also include serialization). But since I am new around here, and you are the sherrifs, I guess you know better what needs a forum and what not.