Adding FileUpload control and updated related components

src/myfasthtml/core/dbmanager.py

@@ -55,7 +55,7 @@ class DbObject:
       self._initializing = old_state
   
   def __setattr__(self, name: str, value: str):
-    if name.startswith("_") or getattr(self, "_initializing", False):
+    if name.startswith("_") or name.startswith("ns") or getattr(self, "_initializing", False):
       super().__setattr__(name, value)
       return
     
@@ -74,7 +74,8 @@ class DbObject:
       self._save_self()
   
   def _save_self(self):
-    props = {k: getattr(self, k) for k, v in self._get_properties().items() if not k.startswith("_")}
+    props = {k: getattr(self, k) for k, v in self._get_properties().items() if
+             not k.startswith("_") and not k.startswith("ns")}
     if props:
       self._db_manager.save(self._name, props)