新增databases.py把所有建表基类统一成一个，才可以链接外键。

scores/model/score_model.py

@@ -1,7 +1,8 @@
+from databases import engine_all,Base_all,Session
 from scores.database import Base
 from datetime import datetime
 from sqlalchemy import DateTime,Column,Integer,String,Float
-class Score(Base):
+class Score(Base_all):
     __tablename__='scores'
     id = Column(Integer
                  ,primary_key = True