You could always just reload your most recent backup.  Though, jmm's suggestion would also work as long as that season is listed there. If not, you'd have to probably manually delete every field in the database for that year.
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"And Shepherds we shall be, For thee, my Lord, for thee.
Power hath descended forth from Thy hand, Our feet may swiftly carry out Thy commands.
So we shall flow a river forth to Thee, And teeming with souls shall it ever be.
In Nomeni Patri Et Fili Spiritus Sancti."
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