Blender - Rename collections hidden in render to DEL_

import bpy

prefix = "DEL__"
changed = []

for coll in bpy.data.collections:
    if coll.hide_render:
        if not coll.name.startswith(prefix):
            coll.name = prefix + coll.name
            changed.append(coll.name)
        else:
            changed.append(coll.name)  # already prefixed

if changed:
    print(f"Marked {len(changed)} collections (prefix='{prefix}'):")
    for n in changed:
        print("  ", n)
else:
    print("No collections with render disabled were found.")