fix misprint

app/core/models/promo.py

@@ -3,7 +3,7 @@ from sqlalchemy import Column, BigInteger, Integer, String, ForeignKey, DateTime
 from datetime import datetime
 
 
-class PromoAction:
+class PromoAction(AlchemyBase):
     __tablename__ = 'promo_actions'
 
     id = Column(Integer, autoincrement=True, primary_key=True)

app/core/models/tasks.py

@@ -3,7 +3,7 @@ from sqlalchemy import Column, BigInteger, Integer, String, ForeignKey, DateTime
 from datetime import datetime
 
 
-class BlockchainTask:
+class BlockchainTask(AlchemyBase):
     __tablename__ = 'blockchain_tasks'
 
     id = Column(Integer, autoincrement=True, primary_key=True)