Does peewee support MySQL REPLACE INTO syntax?
Not at present, but I would consider a pull request and would work with you on getting the code into good shape. For now I'd suggest using hand-written SQL queries if you want upserts with MySQL.

I only see upsert support for SQLite in documentation.

And another question, does peewee support MySQL `INSERT IGNORE` or `INSERT...ON DUPLICATE KEY UPDATE` syntax?
