Clear the score when the user fully unstakes #2992
Merged
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Context
A small adjustment based on the new requirement.
When a user fully unstakes, his reward will become 0 according to the current logic, which is fine. However, his score shouldn't participate in the reward calculation, which is unfair to other users.
This PR fixes it in a brutal way - there's room to improve: both structural and algorithmetic way - but the time is limited, we can do the improvement later.
This PR simply clears the user's score for whoever has 0 staking when we calculate the rewards.
We can't simply remove the entry from
Scores
as the user might still have unclaimed reward.