Peewee is a simple and small ORM. It has few (but expressive) concepts, making it easy to learn and intuitive to use.

a small, expressive ORM

• python 2.7+ and 3.4+ (developed with 3.6)
• supports sqlite, mysql, postgresql and cockroachdb
• tons of extensions
• Peewee’s source code hosted on GitHub.

We’ve spent the last two years automating and improving our migration process to address key issues we were having — manual intervention, backwards compatibility, correctness, and performance. This post dives into the problems we ran into and highlights some learnings and tools we made along the way.