1) Welcome to the Party!
2) As you are obviously new here, I have some suggestions to help us all help you:
When you post, please post your entire configuration including (but not limited to) your installation method and vicidial version with build.
This IS a requirement for posting along with reading the stickies (at the top of each forum) and the manager's manual (available on EFLO.net, both free and paid versions)
You should also post: Asterisk version, telephony hardware (model number is helpful here), cluster information if you have one, and whether any other software is installed in the box. If your installation method is "from scratch" you must post your operating system and should also post the .iso version from which you installed your original operating system. If your installation is "Hosted" list the site name of the host.
If this is a "Cloud" or "Virtual" server, please note the technology involved along with the version of that techology (ie: VMware Server Version 2.0.2). If it is not, merely stating the Motherboard model # and CPU would be helpful.
Similar to This:
Vicibox X.X from .iso | Vicidial X.X.X-XXX Build XXXXXX-XXXX | Asterisk X.X.X | Single Server | No Digium/Sangoma Hardware | No Extra Software After Installation | Intel DG35EC | Core2Quad Q6600
3) This is obviously not a "General Discussion" question, it's a "Support" question. I'll be moving the post accordingly. Tsk. LOL
4) MySQL does not have an Undelete. Vicidial uses the mysql delete function, so you're stuck there (SugarCRM and many other apps don't really delete ... they change a field named deleted to "Y" and then ignore the entry from that point forward. Not Vicidial. Bummer.)
5) MySQL does, however, have backup functionality and binary logs. If you have backups running (which we do automatically on all servers *we* build for clients), you can restore yesterday's backup into a junk database, extract your list, and delete the junk DB and you're done. If you don't have daily backup configured ... you could attempt the binary logs, but this is a tricky scenario (and you should unquestionably get a solid backup before you begin ...).
6) Why on Earth would you delete a list? Please tell me it's not because you were going to re-upload it later and you wanted to avoid dupes. I've got a long speech on that topic.
7) Happy Hunting!