-- Target only an explicitly authorized local/dev connection and baiyue_iam.
-- Preserve existing customer rows and never reset an existing sequence backwards.
USE baiyue_iam;
CREATE TABLE IF NOT EXISTS iam_number_sequence (
  sequence_key VARCHAR(64) NOT NULL COMMENT '业务编号类型',
  next_value BIGINT UNSIGNED NOT NULL COMMENT '下一待分配数字',
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3) COMMENT '更新时间',
  PRIMARY KEY (sequence_key)
) ENGINE=InnoDB COMMENT='IAM业务编号序列表';
START TRANSACTION;
INSERT IGNORE INTO iam_number_sequence(sequence_key, next_value) VALUES ('CUSTOMER_CODE', 1);
SELECT next_value FROM iam_number_sequence WHERE sequence_key='CUSTOMER_CODE' FOR UPDATE;
SET @customer_code_floor = (
  SELECT COALESCE(MAX(CAST(tenant_code AS UNSIGNED)), 0) + 1
  FROM iam_tenant WHERE tenant_code REGEXP '^[0-9]{5}$'
);
UPDATE iam_number_sequence SET next_value=GREATEST(next_value,@customer_code_floor)
WHERE sequence_key='CUSTOMER_CODE';
COMMIT;
SHOW CREATE TABLE iam_number_sequence;
SELECT sequence_key,next_value FROM iam_number_sequence;