docs: annotates the PII tables in Aspects

as per OEP-30

tutoraspects/templates/aspects/apps/aspects/migrations/alembic/versions/0016_event_sink_user_profile.py

@@ -1,5 +1,11 @@
 """
 create user_profile sink table
+
+This table is always created, but it will only be populated if ASPECTS_ENABLE_PII.
+
+.. pii: Stores Open edX user profile data.
+.. pii_types: user_id, name, username, location, phone_number, email_address, birth_date, biography, gender
+.. pii_retirement: local_api, consumer_api
 """
 from alembic import op
 

tutoraspects/templates/aspects/apps/aspects/migrations/alembic/versions/0026_event_sink_external_id.py

@@ -1,5 +1,11 @@
 """
 create external_id sink table
+
+This table is always created, but it will only be populated if ASPECTS_ENABLE_PII.
+
+.. pii: Stores a mapping between an Open edX user and their external_id values stored in Open edX.
+.. pii_types: user_id, username
+.. pii_retirement: local_api, consumer_api
 """
 from alembic import op
 

tutoraspects/templates/aspects/apps/aspects/migrations/alembic/versions/0027_partition_event_sink_user_profile.py

@@ -1,5 +1,9 @@
 """
 Partition the event_sink.user_profile table
+
+.. pii: Stores Open edX user profile data.
+.. pii_types: user_id, name, username, location, phone_number, email_address, birth_date, biography, gender
+.. pii_retirement: local_api, consumer_api
 """
 from alembic import op
 

tutoraspects/templates/aspects/apps/aspects/migrations/alembic/versions/0028_user_pii.py

@@ -1,5 +1,12 @@
 """
 create user_pii table sourced from an in-memory dictionary joining the PII tables.
+
+This table is always created, but it will only be populated if ASPECTS_ENABLE_PII.
+Once accessed, data from this dictionary is cached in-memory for ASPECTS_PII_CACHE_LIFETIME seconds.
+
+.. pii: Stores Open edX user and profile data in a dictionary for use by Superset charts.
+.. pii_types: user_id, name, username, location, phone_number, email_address, birth_date, biography, gender
+.. pii_retirement: local_api, consumer_api
 """
 from alembic import op