<s> from django . db import models <EOL> class Event ( models . Model ) : <EOL> dt = models . DateTimeField ( ) <EOL> class MaybeEvent ( models . Model ) : <EOL> dt = models . DateTimeField ( blank = True , null = True ) <EOL> class Session ( models . Model ) : <EOL> name = models . CharField ( max_length = <NUM_LIT:20> ) <EOL> class SessionEvent ( models . Model ) : <EOL> dt = models . DateTimeField ( ) <EOL> session = models . ForeignKey ( Session , related_name = '<STR_LIT>' ) <EOL> class Timestamp ( models . Model ) : <EOL> created = models . DateTimeField ( auto_now_add = True ) <EOL> updated = models . DateTimeField ( auto_now = True ) </s>
