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I thought the parent was talking about shorting MongoDB ("MDB" NASDAQ ticker)

I agree, though decisions made is isolation can give some peeks into company culture. After all, forests often have many of the same kinds of trees.

And some forests have a few carefully arranged trees of a different type.

Eh it sounds snarky but not a bad idea because the downtime seems inevitable when using MongoDB.

I'm not informed enough to know if it'll affect the share price for a bank but if a tech company did onboard mongo that'd be a major red flag for me.

Yep, also we always remember the markets can stay irrational longer than we can stay solvent or something to that effect.

Why expected down time for dB that has built in replication?

I would expect downtime from RDBMSS and most banks have scheduled downtime nearly every weekend they say when I log in.