new_contents: 
  from google.appengine.ext import ndb
  
  class consrains(ndb.Model):
  	Date = ndb.StringProperty(kind = String)
  	EmployeeID = ndb.StringProperty(kind = int)
  	ShiftType = ndb.StringProperty()
  	ConstrainKind = ndb.StringProperty()
  	Notes = ndb.StringProperty()
  	
  	
  	
  	
  	
  	
  	
  	
  	
subject: add constrains