3.15.4

• Raise an exception in ReconnectMixin if connection is lost while inside a transaction (if the transaction was interrupted presumably some changes were lost and explicit intervention is needed).
• Add db.Model property to reduce boilerplate.
• Add support for running prefetch() queries with joins instead of subqueries (this helps overcome a MySQL limitation about applying LIMITs to a subquery).
• Add SQL AVG to whitelist to avoid coercing by default.
• Allow arbitrary keywords in metaclass constructor, #2627
• Add a pyproject.toml to silence warnings from newer pips when wheel package is not available.

This release has a small helper for reducing boilerplate in some cases by
exposing a base model class as an attribute of the database instance.

# old:
db = SqliteDatabase('...')

class BaseModel(Model):
    class Meta:
        database = db

class MyModel(BaseModel):
    pass

# new:
db = SqliteDatabase('...')

class MyModel(db.Model):
    pass

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