Make a partly-undone import retryable, and refuse a plan it cannot deliver

shopdb/core/models/base.py

@@ -29,10 +29,37 @@ class BaseModel(db.Model):
     )
     isactive = db.Column(db.Boolean, default=True, nullable=False)
 
+    # Columns the default to_dict NEVER emits, whatever model carries them.
+    #
+    # The default serialiser walks __table__.columns and publishes every one, so
+    # a model that does not override it publishes whatever it has - including
+    # columns added to it later, by someone who was not thinking about this
+    # method. User is the live example: it does not override to_dict, so
+    # User.to_dict() returns passwordhash. Nothing calls it in a response path
+    # today, which is luck rather than design.
+    #
+    # A blanket allowlist would be the stronger rule, but it would also silently
+    # empty the output of all 34 models that rely on this default. This is the
+    # part that can be fixed without breaking anything: name the columns that
+    # must never be published, and let a model add its own.
+    #
+    # A model with something sensitive should still override to_dict and say
+    # exactly what it emits. This is a floor, not permission to skip that.
+    HIDDEN_COLUMNS = frozenset({
+        'passwordhash',
+        'tokenhash',
+        'apikey',
+        'clientsecret',
+        'collectorkey',
+    })
+
     def to_dict(self):
-        """Convert model to dictionary."""
+        """Convert model to dictionary, minus anything secret-bearing."""
+        hidden = self.HIDDEN_COLUMNS
         result = {}
         for c in self.__table__.columns:
+            if c.name in hidden:
+                continue
             value = getattr(self, c.name)
             if isinstance(value, datetime):
                 value = value.isoformat() + 'Z'