Add pubkey deletion parser

Ditto/massdelete.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+#generate a list of delete statements, based on pubkeys. raw text, one pubkey per line from source file.
+while read -r line; do printf "delete FROM public.nostr_events WHERE pubkey='$line';\n" >> banlist.sql ; done < "$1"