fix: update default content delivery frequency to weekly

src/models/_user.py

@@ -21,7 +21,7 @@ class User(Base):
     content_delivery_frequency = Column(
         Enum(ContentDeliveryFrequency),
         nullable=False,
-        default=ContentDeliveryFrequency.DAILY,
+        default=ContentDeliveryFrequency.WEEKLY,
     )
     slack_id = Column(String, nullable=True)
     slack_team_id = Column(