vdb

https://github.com/pniemczyk/vdb

vdb mounts a self-contained D3-powered entity-relationship diagram at any path in your Rails app. It reads db/schema.rb (and any additional schema files you configure), infers FK relationships, and renders an interactive force-directed graph with search, zoom, drag-to-rearrange, and position persistence. Ships with zero asset-pipeline dependencies — D3 and Stimulus are loaded from CDN. Recommended for development environments only.