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reddit-purger
A Python script to delete all comment and submission data from a given Reddit account.
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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.
For whatever reason reddit designed their database so it only lets you get the last 1,000 of pretty much anything (user comments, saved posts, subreddit posts, etc.) Pushshift should have all 2,830 of your comments. I haven't tried it but it looks like someone wrote a script which uses that data to delete them: https://github.com/redowul/reddit-purger. And of course be sure to opt out of Pushshift afterwards