key is now just an attribute of the user model. Added 'creator' field to sliver model
diff --git a/planetstack/core/models/plcorebase.py b/planetstack/core/models/plcorebase.py
index ed7c3ff..709fdc6 100644
--- a/planetstack/core/models/plcorebase.py
+++ b/planetstack/core/models/plcorebase.py
@@ -6,6 +6,7 @@
 
     created = models.DateTimeField(auto_now_add=True)
     updated = models.DateTimeField(auto_now=True)
+    enacted = models.DateTimeField(null=True, default=None)
 
     class Meta:
         abstract = True