Вроде пофиксил всё

instance/model.py

@@ -23,18 +23,19 @@ class User(Base):
     __tablename__ = 'users'
 
     id = Column(UUID(as_uuid=True), primary_key=True, default=generate_uuid)
-    telegram_id = Column(String, unique=True, nullable=False)
+    telegram_id = Column(String, unique=True, nullable=False)  # telegram_id как уникальный идентификатор
     username = Column(String)
     balance = Column(Numeric(10, 2), default=0.0)
-    referrer_id = Column(UUID(as_uuid=True), ForeignKey('users.id'), nullable=True)  # Кто пригласил
+    referrer_id = Column(String, ForeignKey('users.telegram_id'), nullable=True)  # Ссылка на telegram_id
     created_at = Column(DateTime, default=datetime.utcnow)
     updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
 
-    referrals = relationship("User", backref="referrer", remote_side=[id])  # Список рефералов
+    referrals = relationship("User", backref="referrer", remote_side=[telegram_id])  # Ссылка на telegram_id
     subscriptions = relationship("Subscription", back_populates="user")
     transactions = relationship("Transaction", back_populates="user")
     admins = relationship("Administrators", back_populates="user")
 
+
 """Подписки"""
 class Subscription(Base):
     __tablename__ = 'subscriptions'