Hi, I have some issue 

I try implement track logic
I have 2 Models and connecting Table

My first class

class MODEL_1(object):
    # some values

    # relations:
    attr_1 = db.relationship('MODEL_2',
                           secondary="test2test",
                           lazy='dynamic',
                           primaryjoin="MODEL_1.id == test2test.c.first_id",
                           secondaryjoin='test2test.c.second_id == 
Site.entity_id')

Second class

class MODEL_2(object):
    # some values
    attr_2 = db.relationship('MODEL_1', secondary='test2test', lazy='dynamic')


And relation table


t_ = db.Table(
    'test2test',
    db.Model.metadata,

    db.Column('first_id', db.Integer,
              db.ForeignKey('MODEL_1.entity_id'),
              nullable=False),
    db.Column('second_id', db.Integer,
              db.ForeignKey('MODEL_2.id'),
              nullable=False),
    db.UniqueConstraint('first_id', 'second_id', name='uq_test2test')
)


I have some questions

1. can i do some table event what will fire, when will change some values in t_ 
table ?

2. if i set before_flush event and change some in MODEL_1, event fire, but 
session have no modified objects 

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