I accidently deleted mssqlsystemresource.mdf and mssqlsystemresource.ldf.
I undeleted them both, but the .ldf file is corrupted (bad FGID), and because of this I can no longer start up my database instance.
There have never been any backups of the system databases. I have a database with a ton of data on it within this instance. I do have a week old backup of that data, but would rather not restore it.
Any advice on how to quickly get my instance up and running again?