I made a horrible mistake when using Redis

Earlier this morning I was trying to fix some data in my Redis database, I renamed one key to another with the RENAME command, without realizing the key I renamed to already existed. So what happened? Here is the doc:

If newkey already exists it is overwritten, when this happens RENAME executes an implicit DEL operation,

When you execute RENAME key1 key2, the data in key2 will be deleted, and unless you have dumped the data, there is no way to get your data back. That’s how I lost my data. Right now I am crawling the etherscan.io page to get them back, it might take me an entire afternoon.

The merit of my story, backup you key before you use RENAME.