I have settled on https://readeck.org/ it's absolutely brilliant. It supports postgres and a service with systemd. omnom looks promising, will keep an eye on it.
My dream tool allows me to create snapshots from either mobile or desktop browser, then read and highlight on my Android eInk reader or phone, then export my highlights and notes into Logseq...all without collecting all my data and selling it to advertisers (which basically leaves me with FOSS tools).
Omnivore was as close as I've ever gotten to this dream, even though their Android app wasn't great and certainly didn't have an "eInk pagination" option, but Readeck is at least giving me some hope again once Omni sold out.
Your app looks really and the website is also cool but Readeck and Omnom are both selfhosted bookmark managers. A cool app is good to have but not a requirement.