Why does SQLAlchemy get me the error of my code? - python-3.x

Question

Please help.
I try to use SQLAlchemy with dataclasses.
Here is the code.
from dataclasses import fields
from sqlalchemy import Column
from sqlalchemy import Integer, Boolean, String
from sqlalchemy import MetaData
from sqlalchemy import Table
from sqlalchemy.orm import registry
from models import Project, Model, Test
TABLES: dict = {}
#dataclass
class Test:
identifier: int = field(init=False)
name: str = None
def create_table(
sql_mapper_registry: registry, sql_metadata: MetaData, model: type[Test]
) -> None:
table_name: str = model.__name__.lower() + "_table"
TABLES[table_name] = Table(table_name, sql_metadata)
for i in range(len(fields(model))):
if fields(model)[i].type == type(bool()):
type_var = Boolean
elif fields(model)[i].type == type(int()):
type_var = Integer
elif fields(model)[i].type == type(str()):
type_var = String(60)
else:
raise TypeError
TABLES[table_name].append_column(
Column(
fields(model)[i].name,
type_var,
primary_key=(fields(model)[i].name == "identifier"),
)
)
sql_mapper_registry.map_imperatively(
model,
TABLES[table_name],
)
return None
if __name__ == '__main__':
engine = create_engine("mariadb+mariadbconnector://root:Password#127.0.0.1:3306/company")
metadata_obj.create_all(engine)
session = orm.sessionmaker(bind=engine)()
create_table(mapper_registry, metadata_obj, Test)
test = Test()
session.add(test)
session.commit()
But this doen't work and i don`t know why.
I've got this error:
sqlalchemy.exc.OperationalError: (mariadb.OperationalError)
Unknown prepared statement handler (4294967295) given to mysqld_stmt_execute
[SQL: INSERT INTO test_table (name) VALUES (?)]
[parameters: (None,)]
I want to update the table with data of class Test.