/usr/share/doc/liquidsoap/html/scripts/bubble_full.liq is in liquidsoap 1.0.0-4build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | bubble = "/home/dbaelde/savonet/bubble/src/bubble-query " ^
"-d /var/local/cache/bubble/bubble.sql "
add_protocol(
"bubble",
fun (arg,delay) -> get_process_lines(bubble^quote(arg)))
|