Yes, you should crack the databank. While being a merc is often about knowing your place and when it's best not to ask questions, this specific job rewards you for a bit of light snooping. If you decide not to crack the databank, you will get the default reward from the task when you return to Sandra.

What happens if you look at Sandra's databank?

After you've secured the databank, call Sandra and she'll give you the coordinates to her apartment in Little China. ... And if you read the contents of the databank, admit that you did, and try to blackmail her, Sandra and her turret will become hostile and you have to take them both out.

What happens if you hack Sandra's databank?

If you hacked the databank and pick “Of course not.” you will get a lower reward. Going with “Yes, I did” and then saying “I wanna congratulate you” will net a slightly higher reward. If you do the same as above and then have an intelligence attribute level of 7 or above will let you discuss daemons with her.