coleifer/peewee 3.4.0 on GitHub

Backwards-incompatible changes

The regexp() operation is now case-sensitive for MySQL and Postgres. To perform case-insensitive regexp operations, use iregexp().
The SQLite BareField() field-type now supports all column constraints except specifying the data-type. Previously it silently ignored any column constraints.
LIMIT and OFFSET parameters are now treated as parameterized values instead of literals.
The schema parameter for SQLite database introspection methods is no longer ignored by default. The schema corresponds to the name given to an attached database.
ArrayField now accepts a new parameter field_kwargs, which is used to pass information to the array field's field_class initializer.

New features and other changes

SQLite backup interface supports specifying page-counts and a user-defined progress handler.
GIL is released when doing backups or during SQLite busy timeouts (when using the peewee SQLite busy-handler).
Add NATURAL join-type to the JOIN helper.
Improved identifier quoting to allow specifying distinct open/close-quote characters. Enables adding support for MSSQL, for instance, which uses square brackets, e.g. [table].[column].
Unify timeout interfaces for SQLite databases (use seconds everywhere rather than mixing seconds and milliseconds, which was confusing).
Added attach() and detach() methods to SQLite database, making it possible to attach additional databases (e.g. an in-memory cache db).