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diff --git a/docs/reference/gen-rand-cdr.sql b/docs/reference/gen-rand-cdr.sql
new file mode 100644
index 0000000..f99a047
--- /dev/null
+++ b/docs/reference/gen-rand-cdr.sql
@@ -0,0 +1,66 @@
+-- 1. 建辅助数字表
+DROP TABLE IF EXISTS tmp_num_100;
+CREATE TABLE tmp_num_100 (n TINYINT UNSIGNED PRIMARY KEY);
+INSERT INTO tmp_num_100(n)
+SELECT a.n + b.n AS n FROM (
+  SELECT 0 n UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4
+  UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9
+) a
+CROSS JOIN (
+  SELECT 0 n UNION ALL SELECT 10 UNION ALL SELECT 20 UNION ALL SELECT 30 UNION ALL SELECT 40
+  UNION ALL SELECT 50 UNION ALL SELECT 60 UNION ALL SELECT 70 UNION ALL SELECT 80 UNION ALL SELECT 90
+) b
+ORDER BY a.n + b.n;
+
+DROP TABLE IF EXISTS tmp_num_500;
+CREATE TABLE tmp_num_500 (n SMALLINT UNSIGNED PRIMARY KEY);
+INSERT INTO tmp_num_500(n)
+SELECT t.n FROM (
+  SELECT @r:=@r+1 n
+  FROM (SELECT 0 FROM tmp_num_100) a,
+       (SELECT 0 FROM tmp_num_100) b,
+       (SELECT @r:=-1) init
+  LIMIT 500
+) t;
+
+-- 2. 目标表（若未建）
+-- CREATE TABLE cdr_event_smsc (
+--   id BIGINT AUTO_INCREMENT PRIMARY KEY,
+--   ne_type VARCHAR(16),
+--   ne_name VARCHAR(64),
+--   rm_uid VARCHAR(64),
+--   `timestamp` BIGINT,
+--   cdr_json JSON,
+--   created_at DATETIME,
+--   tenant_id VARCHAR(64)
+-- ) ENGINE=InnoDB;
+
+-- 3. 关闭一些约束提高插入速度（可选）
+SET autocommit = 0;
+SET unique_checks = 0;
+SET foreign_key_checks = 0;
+
+-- 4. 插入 500 万（100 * 100 * 500）
+-- 随机时间：过去一年内的任意秒（不均匀）
+SET @start_ts = UNIX_TIMESTAMP(DATE_SUB(CURDATE(), INTERVAL 365 DAY));
+SET @range_sec = 365 * 24 * 3600;
+
+INSERT INTO cdr_event_smsc
+  (ne_type, ne_name, rm_uid, `timestamp`, cdr_json, created_at)
+SELECT
+  'SMSC' AS ne_type,
+  'SMSC_001' AS ne_name,
+  '4400HXSMSC001' AS rm_uid,
+  @start_ts + FLOOR(RAND()*@range_sec) AS `timestamp`,
+  '{\"calledParty\":\"15731123455\",\"callerParty\":\"18165338055\",\"cause\":28,\"recordType\":\"MTSM\",\"result\":0,\"serviceType\":\"Normal\",\"updateTime\":\"2025-08-18T11:09:52.703Z\"}' AS cdr_json,
+  NOW() AS created_at
+FROM tmp_num_100 a
+CROSS JOIN tmp_num_100 b
+CROSS JOIN tmp_num_500 c;
+
+COMMIT;
+
+-- 5. 恢复
+SET unique_checks = 1;
+SET foreign_key_checks = 1;
+SET autocommit = 1;