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为奖池增加了一个可选的
activity
外键,如果非空,会在用户兑换前检查是否已参加这个活动。如果未参加,将拒绝用户的兑换/抽奖/盲盒请求:顺便修了一下 #834 中的一个小问题:把奖池奖品表中的“属性”改为可选,不然所有的记录都必须要设置非空的属性。