Subclass the SQLAlchemy class and override that function. This is an accepted method of customization in the Flask realm. The Flask docs themselves talk about subclassing the Flask class to get what you need.
This isn't tested, but here's a start. It allows kwargs to be passed to execute and reflect, passing them on to the real op.
class MySQLAlchemy(SQLAlchemy):
def _execute_for_all_tables(self, app, bind, operation, **kwargs):
app = self.get_app(app)
if bind == '__all__':
binds = [None] + list(app.config.get('SQLALCHEMY_BINDS') or ())
elif isinstance(bind, basestring) or bind is None:
binds = [bind]
else:
binds = bind
for bind in binds:
tables = self.get_tables_for_bind(bind)
op = getattr(self.Model.metadata, operation)
op(bind=self.get_engine(app, bind), tables=tables, **kwargs)
def reflect(self, bind='__all__', app=None, **kwargs):
self._execute_for_all_tables(app, bind, 'reflect', **kwargs)