So I have seen some chats here about cred refresh from vault and some 
suggestions have been to use @event.listens_for(engine, "do_connect") to 
update creds when the connection is established. My understanding of this 
is that connecting to the database should only happen once when my flask 
application starts up, but I need to update the creds without restarting my 
application so I'm not sure that the event listener will work in my case.

Am I understanding that correctly? If so, is there a way to get the right 
creds to pass to the engine for sqlalchemy every 24 hours when the creds 
from vault get updated without restarting my application?

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SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

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