add expiration_date to manual task order form

atst/models/task_order.py

@@ -1,6 +1,6 @@
 from enum import Enum
 
-from sqlalchemy import Column, Integer, String, ForeignKey, Enum as SQLAEnum
+from sqlalchemy import Column, Integer, String, ForeignKey, Enum as SQLAEnum, Date
 from sqlalchemy.orm import relationship
 
 from atst.models import Base
@@ -32,6 +32,7 @@ class TaskOrder(Base):
     clin_1003 = Column(Integer)
     clin_2001 = Column(Integer)
     clin_2003 = Column(Integer)
+    expiration_date = Column(Date())
 
     attachment_id = Column(ForeignKey("attachments.id"))
     pdf = relationship("Attachment")