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docs/database/01-saas/wms_number_sequence.sql

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+-- 表：wms_number_sequence
+-- 用途：单号序列。按租户、业务类型发号，保证并发下单号不重复。
+-- 约定：InnoDB / utf8mb4 / 无外键，表间按业务编码关联。详见 docs/database/00-conventions.md
+-- 说明：发号必须用单条原子更新：UPDATE ... SET current_value = LAST_INSERT_ID(current_value + 1)，再 SELECT LAST_INSERT_ID()。禁止先查后加。
+
+CREATE TABLE `wms_number_sequence` (
+  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '内部主键',
+  `tenant_code` VARCHAR(32) NOT NULL COMMENT '租户编码',
+  `biz_type` VARCHAR(32) NOT NULL COMMENT '业务类型，如 order、inbound、outbound、picking',
+  `period_key` VARCHAR(16) NOT NULL DEFAULT '' COMMENT '重置周期，如 202609；空表示连续递增',
+  `current_value` BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT '当前已分配到的序号',
+  `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) COMMENT '创建时间',
+  `updated_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3) COMMENT '更新时间',
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `uk_tenant_biz_period` (`tenant_code`, `biz_type`, `period_key`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='单号序列';