rails-knowledge-patch

Most of the fragment is standard Rails/ActiveRecord configuration guidance. The key supply-chain risk is the SQLite `extensions` entry that loads a native `.so` from a relative bundled path via `database.yml`, which—if the artifact is tampered with—can enable native code execution in the application/SQLite runtime context. Transaction isolation and connection pooling changes are comparatively lower concern, and invisible index toggling is mainly an operational/query-behavior feature. Verify provenance and integrity (build pipeline, artifact signing/hashes, and runtime path validation) of the referenced native extension before use.