ERAlchemy

About ERAlchemy

Python library designed to create Entity Relationship diagrams by extracting data from databases or SQLAlchemy models. Particularly useful for database designers and developers who need to visualize and interpret complex relationships within database systems. Generates diagrams automatically from your Python code.

Key Features

• 1Generates ER diagrams from SQLAlchemy models or database connections
• 2Outputs PNG, PDF, or Graphviz `.dot` format diagrams
• 3Works with any SQLAlchemy-supported database
• 4Command-line tool and Python API for integration into documentation pipelines
• 5No manual diagram maintenance — always reflects the actual code or schema

How Python Data Engineers Use ERAlchemy

Data engineers use ERAlchemy to auto-generate ER diagrams from SQLAlchemy model definitions — running `eralchemy -i 'postgresql://user:pass@host/db' -o erd.png` produces an up-to-date diagram from the live database. This is commonly automated in CI/CD to keep schema documentation current with every migration.