docs: Add PII annotations (#273)

Per OEP-30 these annotations belong with their models, I'm just moving
them from the edx-platform safelist to their correct homes.

submissions/models.py

@@ -7,7 +7,6 @@
 need to then generate a matching migration for it using:
 
     ./manage.py makemigrations submissions
-
 """
 
 import logging
@@ -34,7 +33,9 @@
 
 
 class AnonymizedUserIDField(models.CharField):
-    """ Field for storing anonymized user ids. """
+    """
+    Field for storing anonymized user ids.
+    """
     description = "The anonymized User ID that the XBlock sees"
 
     def __init__(self, *args, **kwargs):
@@ -50,11 +51,13 @@ def deconstruct(self):
 
 
 class StudentItem(models.Model):
-    """Represents a single item for a single course for a single user.
+    """
+    Represents a single item for a single course for a single user.
 
     This is typically an XBlock problem, but could be something more generic
     like class participation.
 
+    .. no_pii:
     """
     # The anonymized Student ID that the XBlock sees, not their real ID.
     student_id = AnonymizedUserIDField()
@@ -111,6 +114,8 @@ class TeamSubmission(TimeStampedModel):
     An abstraction layer over Submission used to for teams. Since we create a submission record for every team member,
     there is a need to have a single point to connect the team to the workflows.
     TeamSubmission is a 1 to many with Submission
+
+    .. no_pii:
     """
 
     uuid = models.UUIDField(db_index=True, default=uuid4, null=False)
@@ -287,14 +292,16 @@ def validate_only_one_submission_per_team(sender, **kwargs):  # pylint:disable=u
 
 
 class Submission(models.Model):
-    """A single response by a student for a given problem in a given course.
+    """
+    A single response by a student for a given problem in a given course.
 
     A student may have multiple submissions for the same problem. Submissions
     should never be mutated. If the student makes another Submission, or if we
     have to make corrective Submissions to fix bugs, those should be new
     objects. We want to keep Submissions immutable both for audit purposes, and
     because it makes caching trivial.
 
+    .. no_pii:
     """
     MAXSIZE = 1024*100  # 100KB
 
@@ -363,12 +370,15 @@ class Meta:
 
 
 class Score(models.Model):
-    """What the user scored for a given StudentItem at a given time.
+    """
+    What the user scored for a given StudentItem at a given time.
 
     Note that while a Score *can* be tied to a Submission, it doesn't *have* to.
     Specifically, if we want to have scores for things that are not a part of
     the courseware (like "class participation"), there would be no corresponding
     Submission.
+
+    .. no_pii:
     """
     student_item = models.ForeignKey(StudentItem, on_delete=models.CASCADE)
     submission = models.ForeignKey(Submission, null=True, on_delete=models.CASCADE)
@@ -449,7 +459,6 @@ def create_reset_score(cls, student_item):
 
         Raises:
             DatabaseError: An error occurred while creating the score
-
         """
         # By setting the "reset" flag, we ensure that the "highest"
         # score in the score summary will point to this score.
@@ -468,7 +477,11 @@ def __str__(self):
 
 
 class ScoreSummary(models.Model):
-    """Running store of the highest and most recent Scores for a StudentItem."""
+    """
+    Running store of the highest and most recent Scores for a StudentItem.
+
+    .. no_pii:
+    """
     student_item = models.OneToOneField(StudentItem, on_delete=models.CASCADE)
 
     highest = models.ForeignKey(Score, related_name="+", on_delete=models.CASCADE)
@@ -488,7 +501,6 @@ def update_score_summary(sender, **kwargs):  # pylint: disable=no-self-argument
 
         Kwargs:
             instance (Score): The score model whose save triggered this receiver.
-
         """
         score = kwargs['instance']
         try:
@@ -529,7 +541,11 @@ def update_score_summary(sender, **kwargs):  # pylint: disable=no-self-argument
 
 
 class ScoreAnnotation(models.Model):
-    """ Annotate individual scores with extra information if necessary. """
+    """
+    Annotate individual scores with extra information if necessary.
+
+    .. no_pii:
+    """
 
     class Meta:
         app_label = "submissions"