The database is the logical place to perform any work to filter and sort data. Doing this in the application is a waste. However, for a simple blog that is updated infrequently, a database may be unnecessary in the first place. It may even become the bottleneck and slow the whole blog down. This is a typical problem of blog engines, such as WordPress. A better approach may be to use a static site generator.
A static site generator prerenders all of the pages and saves the resulting HTML. This can easily be served by a simple web server and scales well. When a change is made and pages need updating, then the site is regenerated and a new version is deployed. This approach doesn't include dynamic features, such as comments, ...
