create table sj_sequence_alloc
(
    id           bigint unsigned auto_increment comment '主键'
        primary key,
    namespace_id varchar(64) default '764d604ec6fc45f68cd92514c40e9e1a' not null comment '命名空间id',
    group_name   varchar(64) default ''                                 not null comment '组名称',
    max_id       bigint      default 1                                  not null comment '最大id',
    step         int         default 100                                not null comment '步长',
    update_dt    datetime    default CURRENT_TIMESTAMP                  not null on update CURRENT_TIMESTAMP comment '更新时间',
    constraint uk_namespace_id_group_name
        unique (namespace_id, group_name)
)
    comment '号段模式序号ID分配表';