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eternity
Discontinued bypass Reddit's 1000-item listing limits by externally storing your Reddit items (saved, created, upvoted, downvoted, hidden) in your own database
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
According to Eternity I have over 2000 saved posts and 300+ saved comments. (Eternity itself would work great for my purposes except it doesn't retain the URLs for link posts; it does save the permalinks for the Reddit threads themselves but if the site dies or half the subs stay private those won't be very useful...)