- Incude `channel_id` and `retrieved_at` in the database schema.
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I learned that for 4-SAT, if clause to variable ratio is more than 10, the generated problems become difficult to solve, and the likelihood of formula to be SAT or UNSAT is close to 50%. So I generated 3 types of formulas:，推荐阅读爱思助手下载最新版本获取更多信息
unsigned long long seed;
private static final TransmittableThreadLocal<String currentUser = new TransmittableThreadLocal<();