tree 25cb7bb4450654df8b273b7876fd74703ebd0a58
parent b0c951cbcc122b4807830ce023aab96874ac8cf2
author Tony Mack <tmack@cs.princeton.edu> 1425935594 -0400
committer Tony Mack <tmack@cs.princeton.edu> 1425935594 -0400

define composite primary key for models that need them