~20 years ago I was working for a relatively small banking software company (in Hungary) (it was a really good job from the learning point of view, but was really underpaid).
One Monday afternoon one of our clients just called that the banks officer's suddenly can't log in, random strange errors are getting displayed for them, etc.
OK, our support team tried to check, we can't login either, strange error.
"Did you do anything special, [name of the bank's main sysadmin]?"
"Well, nothing special, I just cleaned up the disks as usual."
"How did you do it?"
"As usual: 'mc', sort by file size in the INTERFACE/ folder, marked the files and F8".
That's normal.
OK, since we had the same user account (I knoooow), launch 'mc'. Looks normal. Except... In the left panel the APP/DB directory is opened... Check... Appears normal... At first... But... WAIT. Where is the <BANKNAME>.DB1 file?
"<ADMIN>, how long time did it take?"
"Dunno, I went for my coffee, etc."
Apparently he deleted the production systems' main DB file. It's got resolved by restoring the backup from Saturday and every file and input transactions had to be re-inputed based on the printed receipts, the officer's stayed in late night, etc. He is still the head of IT at the same bank. (Yeah everyone makes mistakes, but it wasn't the only one of hims, but likely the biggest.)
One Monday afternoon one of our clients just called that the banks officer's suddenly can't log in, random strange errors are getting displayed for them, etc.
OK, our support team tried to check, we can't login either, strange error.
"Did you do anything special, [name of the bank's main sysadmin]?"
"Well, nothing special, I just cleaned up the disks as usual."
"How did you do it?"
"As usual: 'mc', sort by file size in the INTERFACE/ folder, marked the files and F8".
That's normal.
OK, since we had the same user account (I knoooow), launch 'mc'. Looks normal. Except... In the left panel the APP/DB directory is opened... Check... Appears normal... At first... But... WAIT. Where is the <BANKNAME>.DB1 file?
"<ADMIN>, how long time did it take?"
"Dunno, I went for my coffee, etc."
Apparently he deleted the production systems' main DB file. It's got resolved by restoring the backup from Saturday and every file and input transactions had to be re-inputed based on the printed receipts, the officer's stayed in late night, etc. He is still the head of IT at the same bank. (Yeah everyone makes mistakes, but it wasn't the only one of hims, but likely the biggest.)