Prevent deleting autocolumns via keyboard

packages/frontend-core/src/components/sheet/KeyboardManager.svelte

@@ -112,6 +112,9 @@
     if (!$selectedCellId) {
       return
     }
+    if ($selectedCellAPI?.isReadonly()) {
+      return
+    }
     const [rowId, column] = $selectedCellId.split("-")
     rows.actions.updateRow(rowId, column, null)
   }, 100)

packages/frontend-core/src/components/sheet/cells/DataCell.svelte

@@ -20,7 +20,10 @@
 
   $: {
     if (selected) {
-      selectedCellAPI.set(api)
+      selectedCellAPI.set({
+        ...api,
+        isReadonly: () => !!column.schema.autocolumn,
+      })
     }
   }
 </script>
@@ -46,4 +49,4 @@
     onChange={val => rows.actions.updateRow(row._id, column.name, val)}
     readonly={column.schema.autocolumn}
   />
-</SheetCell>
+</SheetCell>