Readgraph: Self-hosted AI workstation that fights the forgetting curve

Hey Product Hunt 👋 I built ReadGraph while working full-time — nights and weekends — because I kept buying books, reading them, and forgetting almost everything within a week. The core problem: we forget up to 90% of new information within 7 days without reinforcement. Every highlight app, note-taking tool, and AI chatbot I tried solved part of the problem but none connected the dots. So I built something that does all of it in one place: AI Mentor — asks your books, your uploaded docs, and the web before answering. Every response shows a Sources panel so you can verify every claim. 3D Knowledge Graph — every concept from every book mapped as a living network. Connections you'd never notice reading linearly. Spaced Repetition Assessments — built from your own page notes using Bloom's taxonomy. Not generic quiz questions. File Attachments — drop a pitch deck, market report, or spreadsheet into any chat session. AI reads it alongside your books. Budget Controls — set a hard spending limit. ReadGraph won't go over it. With free models via OpenRouter, many users run it for near $0/month. Everything runs on your local PostgreSQL database. No cloud. No subscription. One-time $149. Happy to answer any questions below — especially from anyone who's tried Readwise, Obsidian, or Notion AI and felt like something was still missing.