diff --git a/docs/sql/migrations/2026-11-05-protocol-operation-log.sql b/docs/sql/migrations/2026-11-05-protocol-operation-log.sql
index e1b9bada..ea9644f6 100644
--- a/docs/sql/migrations/2026-11-05-protocol-operation-log.sql
+++ b/docs/sql/migrations/2026-11-05-protocol-operation-log.sql
@@ -1,6 +1,10 @@
 -- Issue #24：协议单操作过程日志（before / action / after）
 -- MySQL 5.7；可重复执行（CREATE IF NOT EXISTS）。上线前须备份并在目标副本验证。
 -- DDL 隐式提交；该脚本不作为自动应用启动步骤。
+--
+-- 注意：若目标库已存在同名「采集协议单操作日志」旧表（含 collection_protocol_id /
+-- operation_code 等列），本脚本会因 IF NOT EXISTS 直接跳过，不会纠偏。
+-- 生产纠偏请改用：2026-11-09-protocol-operation-log-rebuild.sql
 
 CREATE TABLE IF NOT EXISTS biz_protocol_operation_log (
   id VARCHAR(64) NOT NULL,
diff --git a/docs/sql/migrations/2026-11-09-protocol-operation-log-rebuild.sql b/docs/sql/migrations/2026-11-09-protocol-operation-log-rebuild.sql
new file mode 100644
index 00000000..443f7ede
--- /dev/null
+++ b/docs/sql/migrations/2026-11-09-protocol-operation-log-rebuild.sql
@@ -0,0 +1,119 @@
+-- =============================================================================
+-- 协议操作日志：兼容生产旧表同名冲突，重建为 Issue #24 模型
+-- MySQL 5.7；可重复执行。上线前须备份，并在目标副本验证。
+--
+-- 背景：
+--   生产曾有「采集协议单操作日志」同名表（collection_protocol_id / operation_*），
+--   与当前代码（biz_type / before_json / after_json）不兼容。
+--   旧脚本 2026-11-05-protocol-operation-log.sql 使用 CREATE IF NOT EXISTS，
+--   遇到旧表会直接跳过，无法纠偏。本脚本用于生产纠偏与新环境兜底。
+--
+-- 行为：
+--   1) 已是新模型（有 biz_type）→ 跳过结构变更
+--   2) 旧模型且 0 行 → DROP 后按新模型 CREATE
+--   3) 旧模型且有数据 → RENAME 为 biz_protocol_operation_log_legacy_20261109 再 CREATE
+--   4) 表不存在 → 直接 CREATE
+-- =============================================================================
+
+SET @db := DATABASE();
+
+SET @table_exists := (
+  SELECT COUNT(*) FROM information_schema.tables
+  WHERE table_schema = @db AND table_name = 'biz_protocol_operation_log'
+);
+
+SET @has_legacy_col := (
+  SELECT COUNT(*) FROM information_schema.columns
+  WHERE table_schema = @db
+    AND table_name = 'biz_protocol_operation_log'
+    AND column_name = 'collection_protocol_id'
+);
+
+SET @has_new_col := (
+  SELECT COUNT(*) FROM information_schema.columns
+  WHERE table_schema = @db
+    AND table_name = 'biz_protocol_operation_log'
+    AND column_name = 'biz_type'
+);
+
+SET @is_legacy := IF(@table_exists > 0 AND @has_legacy_col > 0 AND @has_new_col = 0, 1, 0);
+
+SET @legacy_rows := 0;
+SET @cnt_sql := IF(
+  @is_legacy = 1,
+  'SET @legacy_rows = (SELECT COUNT(*) FROM `biz_protocol_operation_log`)',
+  'SET @legacy_rows = 0'
+);
+PREPARE pol_stmt FROM @cnt_sql;
+EXECUTE pol_stmt;
+DEALLOCATE PREPARE pol_stmt;
+
+-- 空旧表：直接删除
+SET @drop_sql := IF(
+  @is_legacy = 1 AND @legacy_rows = 0,
+  'DROP TABLE `biz_protocol_operation_log`',
+  'SELECT ''skip drop empty legacy biz_protocol_operation_log'' AS migration_status'
+);
+PREPARE pol_stmt FROM @drop_sql;
+EXECUTE pol_stmt;
+DEALLOCATE PREPARE pol_stmt;
+
+-- 有数据的旧表：改名保留，避免丢历史（当前生产为 0 行，通常不会走到这里）
+SET @legacy_backup_exists := (
+  SELECT COUNT(*) FROM information_schema.tables
+  WHERE table_schema = @db AND table_name = 'biz_protocol_operation_log_legacy_20261109'
+);
+SET @rename_sql := IF(
+  @is_legacy = 1 AND @legacy_rows > 0 AND @legacy_backup_exists = 0,
+  'RENAME TABLE `biz_protocol_operation_log` TO `biz_protocol_operation_log_legacy_20261109`',
+  IF(
+    @is_legacy = 1 AND @legacy_rows > 0 AND @legacy_backup_exists > 0,
+    'SELECT ''ERROR: legacy backup biz_protocol_operation_log_legacy_20261109 already exists; resolve manually'' AS migration_status',
+    'SELECT ''skip rename legacy biz_protocol_operation_log'' AS migration_status'
+  )
+);
+PREPARE pol_stmt FROM @rename_sql;
+EXECUTE pol_stmt;
+DEALLOCATE PREPARE pol_stmt;
+
+-- 新模型建表（纠偏后或全新环境）
+CREATE TABLE IF NOT EXISTS `biz_protocol_operation_log` (
+  `id` VARCHAR(64) NOT NULL COMMENT '主键ID',
+  `biz_type` VARCHAR(32) NOT NULL COMMENT '业务类型 cell_storage/research_donation',
+  `biz_id` VARCHAR(64) NOT NULL COMMENT '协议单或捐赠单ID',
+  `protocol_no` VARCHAR(64) NULL COMMENT '协议/捐赠编号快照',
+  `action` VARCHAR(32) NOT NULL COMMENT '动作 create/update/delete/void/activate/expire/to_research/to_storage/audit',
+  `client_channel` VARCHAR(16) NOT NULL DEFAULT 'web' COMMENT '来源端 web/mini',
+  `before_json` MEDIUMTEXT NULL COMMENT '操作前协议信息JSON',
+  `after_json` MEDIUMTEXT NULL COMMENT '操作后协议信息JSON',
+  `operator_user_id` VARCHAR(64) NULL COMMENT '操作人用户ID',
+  `operator_user_name` VARCHAR(64) NULL COMMENT '操作人姓名快照',
+  `operate_time` DATETIME NOT NULL COMMENT '业务操作时间',
+  `tenant_no` VARCHAR(64) NOT NULL COMMENT '租户编号',
+  `order_num` INT NULL COMMENT '排序号',
+  `remark` VARCHAR(512) NULL COMMENT '备注',
+  `create_by` VARCHAR(64) NULL COMMENT '创建人id',
+  `create_dept_id` VARCHAR(64) NOT NULL DEFAULT '' COMMENT '创建人部门ID',
+  `create_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+  `update_by` VARCHAR(64) NULL COMMENT '更新人id',
+  `update_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+  `del_flag` SMALLINT NOT NULL DEFAULT 0 COMMENT '删除标记',
+  PRIMARY KEY (`id`),
+  KEY `ix_pol_biz` (`tenant_no`, `biz_type`, `biz_id`, `del_flag`),
+  KEY `ix_pol_time` (`tenant_no`, `operate_time`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='协议单操作过程日志';
+
+-- 验收：新模型关键列应存在
+SELECT
+  COLUMN_NAME,
+  COLUMN_TYPE,
+  IS_NULLABLE,
+  COLUMN_COMMENT
+FROM information_schema.columns
+WHERE table_schema = DATABASE()
+  AND table_name = 'biz_protocol_operation_log'
+  AND COLUMN_NAME IN (
+    'biz_type', 'biz_id', 'action', 'before_json', 'after_json',
+    'client_channel', 'operate_time', 'collection_protocol_id', 'operation_code'
+  )
+ORDER BY ORDINAL_POSITION;