Readeck saves the page, not the link
Readeck stores the readable content of a web page rather than a bookmark pointing at it, which is the whole pitch and the reason to run it. It ships as one executable, runs happily on 512 MB and a forgotten Raspberry Pi 2, and installs from a single docker run or a short compose file with one volume holding database and bookmarks. This profile covers the documented install path, the settings that matter behind a proxy, the export and import commands, and the limits the documentation states.