Maybe bug maybe feature

[Bersenrar]

Hello dear developers, I am newbie to Tortoise and Django-like orm systems. I faced bug which I don't know how to fix

Here is my models:
from tortoise import fields
from tortoise.models import Model

class Product(Model):
id = fields.IntField(primary_key=True)
name = fields.CharField(max_length=500)
description = fields.TextField(null=True)
price_per_unit = fields.FloatField()
purchase_price = fields.FloatField()
retail_price = fields.FloatField()
whole_sail_price = fields.FloatField()
rating = fields.FloatField(null=True)
shelf_life = fields.FloatField(null=True)
units_amount = fields.IntField(null=True)
creation_date = fields.DatetimeField(auto_now_add=True)
last_edit_date = fields.DatetimeField(auto_now=True)
last_edit_user_id = fields.ForeignKeyField("models.User", on_delete=fields.SET_NULL, null=True)

measure_units = fields.ManyToManyField(
    "models.MeasureUnit",
    through="product_measure_unit",
    related_name="products"
)

characteristics = fields.ManyToManyField(
    "models.Characteristic",
    through="product_characteristics",
    related_name="products"
)

categories = fields.ManyToManyField(
    "models.ProductCategory",
    through="assigned_product_categories",
    related_name="products"
)

documents = fields.ManyToManyField(
    "models.Document",
    related_name="products"
)

class Meta:
    table_name = "products"

class MeasureUnit(Model):
id = fields.IntField(primary_key=True)
name = fields.CharField(max_length=200)
abbreviation = fields.CharField(max_length=200)

class Meta:
    table_name = "measure_units"

class ProductMeasureUnit(Model):
product = fields.ForeignKeyField(
'models.Product',
on_delete=fields.CASCADE
)

measure_unit = fields.ForeignKeyField(
    'models.MeasureUnit',
    on_delete=fields.CASCADE
)

coefficient = fields.FloatField(null=True, default=1.0)

class Meta:
    table_name = "product_measure_unit"
    unique_together = (("product", "measure_unit"),)

class Characteristic(Model):
id = fields.IntField(primary_key=True)
name = fields.CharField(max_length=500)
description = fields.TextField(null=True)

class Meta:
    table_name = "characteristics"

class ProductCharacteristic(Model):
product = fields.ForeignKeyField(
"models.Product",
related_name="product_characteristics",
on_delete=fields.CASCADE
)

characteristic = fields.ForeignKeyField(
    "models.Characteristic",
    related_name="product_characteristics",
    on_delete=fields.CASCADE
)

value = fields.TextField(null=True)

class Meta:
    table_name = "product_characteristics"
    unique_together = (("product", "characteristic"),)

class ProductCategory(Model):
id = fields.IntField(primary_key=True)
name = fields.CharField(max_length=255, unique=True)
description = fields.TextField(null=True, blank=True)
parent = fields.ForeignKeyField(
"models.ProductCategory",
related_name="subcategories",
null=True,
blank=True,
on_delete=fields.SET_NULL
)

class Meta:
    table_name = "product_categories"

class AssignedProductCategory(Model):
product = fields.ForeignKeyField(
"models.Product",
on_delete=fields.CASCADE
)
category = fields.ForeignKeyField(
"models.ProductCategory",
on_delete=fields.CASCADE
)

class Meta:
    table_name = "assigned_product_categories"
    unique_together = (("product", "category"),)

class Document(Model):
id = fields.IntField(primary_key=True)
file_path = fields.TextField()

class Meta:
    table_name = "documents"

I have through tables for product, but when I make a migration using aerich I see in pgAdmin duplicates of tables

And also maybe because of that I can't retreive corresponding submodels from model product