Hi,
Today, after importing flow, I enter the information to connect to the database such as Username, Password into the postgres node and then click Deploy button.
When I reopen node postgres, the Username and Password information is lost, I don't understand why, while it was normal yesterday. 
Has anyone seen this? What could be the cause?
Thanks!
What environment/OS are you running node-red under?
Did you change anything in your system? If you have not set a credentials secret in settings.js (there is a warning that you have not if you start node-red in a terminal) then if you lose one of the .config files you will lose all your credentials.
Are there any other nodes in your flow with credentials? If so did they keep theirs?
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