Fix alert script SQL escaping
Fix alert script SQL escaping

(cherry picked from commit 41b7b97b5e606a08cb0a6cadd576d1684288959b)

uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend