let the tagtime users define which side of the YBR is the good one.
It should be an option at goal-creation time.

The current way to set up a TagTime goal is to create it as a Custom goal.
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Admindreeves (Cofounder, Beeminder) commented
@jhamon, I see what you mean! Really the tagtimeyness needs to be an orthogonal choice, so you can pick a Set a Limit goal that happens to get its data from TagTime. In the meantime I just fixed your graph manually.
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jhamon commented
I agree 100%. It's pretty annoying when you automatically fail your goals and any changes you make can't really go into affect until a week from now.
I just made a "timesuck" goal for trying to stay beneath a certain threshold of time wasted on stupid websites. Because I didn't specify a target number of hours per week at creation time, my initial starting slope was 0. Then when I went into preferences and changed options to indicate the line would increase with the bottom side 'good' it triggered an autofail because my data put me above the line y=0 for the first week.
Assuming y=0 as a good default path does not work for those trying to set "limiting" goals. If a slope isn't specified at creation time, we fail as soon as data is inputted by tagtime with no way to adjust it until the following week.