I can add new columns

src/myfasthtml/core/utils.py

@@ -323,6 +323,18 @@ def make_safe_id(s: str | None):
   return res.lower()  # no uppercase
 
 
+def make_unique_safe_id(s: str | None, existing_ids: list):
+  if s is None:
+    return None
+
+  base = make_safe_id(s)
+  res = base
+  i = 1
+  while res in existing_ids:
+    res = f"{base}_{i}"
+    i += 1
+  return res
+
 def get_class(qualified_class_name: str):
   """
     Dynamically loads and returns a class type from its fully qualified name.