用户访问日志可在 ClickHouse、PostgreSQL、SQLite 之间切换。 关闭 ClickHouse 时由主库承接写入与查询;切换任务会冻结写入、复制数据后翻转主库。 启动时校验日志主库与运行配置一致,定期清理按各库保留天数删除过期记录。
Move process wiring, technical adapters, and cross-cutting contracts out of flat internal/ packages so new code has a clear home without changing business layout.