From: Павел

models.py

import peewee

db = peewee.SqliteDatabase('users.db')


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


class User(BaseModel):
    user_id = peewee.IntegerField(unique=True)
    phone = peewee.TextField()

    @classmethod
    def user_exists(cls, uid):
        return cls.select().where(cls.user_id == uid).exists()

    @classmethod
    def add_user(cls, uid, phone):
        if cls.user_exists(uid):
            return False
        return cls.create(user_id=uid, phone=phone)


db.create_tables([User], safe=True)