I just want a very simple program which lets me enter a link, and some tags, and then later easily search on those tags (just 'pull out everything with this tag' would be good enough, but 'pull out everything with all of these tags / any of these tags' would be nice).
Everything I've found has either required me to essentially set up the database schema myself / code it myself, or been special-purpose (e.g. a CRM or a bug tracking system), or had number-of-item restrictions or poor export functionality (I expect to end up with around 100k items in this and I need to know that at least that I can get it out in .csv or similar if necessary).
I've looked at the Self hosted, searchable bookmark application recommendations but I don't want to have to host something open to the web.
Google Bookmarks is very similar to what I want - but appears to only export in an awkward HTML format and doesn't give me the ability to search on multiple tags.