diff --git a/scripts/migrations/20260919_m11b_01_create_pbl_runtime_event.sql b/scripts/migrations/20260919_m11b_01_create_pbl_runtime_event.sql
index cb364c8..421918b 100644
--- a/scripts/migrations/20260919_m11b_01_create_pbl_runtime_event.sql
+++ b/scripts/migrations/20260919_m11b_01_create_pbl_runtime_event.sql
@@ -3,42 +3,41 @@
 -- 幂等: CREATE ... IF NOT EXISTS / DROP ... IF EXISTS
 
 CREATE TABLE IF NOT EXISTS `pbl_runtime_event` (
-  `id` BIGINT NOT NULL AUTO_INCREMENT COMMENT '自增ID(逻辑主键;物理主键=(id,created_at))',
-  `tenant_id` VARCHAR(32) NOT NULL DEFAULT '' COMMENT '租户ID(多租户强制打头)',
-  `event_uid` VARCHAR(64) NOT NULL COMMENT '事件UID(uuid,应用层生成)',
-  `event_code` VARCHAR(64) NOT NULL DEFAULT '' COMMENT '事件编码',
-  `idem_key` VARCHAR(128) NOT NULL DEFAULT '' COMMENT '幂等键(同键重复投递只落一条)',
-  `world_id` BIGINT NOT NULL DEFAULT 0 COMMENT '世界ID(引用 world 基表,只读)',
-  `scene_id` BIGINT NOT NULL DEFAULT 0 COMMENT '场景/会话ID(引用 scense 基表,只读)',
-  `session_id` BIGINT NOT NULL DEFAULT 0 COMMENT '游戏会话ID(M11a 语义,与 scene_id 同域)',
-  `entity_id` VARCHAR(64) NOT NULL DEFAULT '' COMMENT '实体ID(引用 entity 基表,只读)',
-  `actor_id` VARCHAR(64) NOT NULL DEFAULT '' COMMENT '触发者(服务端会话解析,客户端禁填)',
-  `event_type` VARCHAR(64) NOT NULL COMMENT '事件类型',
-  `payload` TEXT NULL COMMENT '事件负载JSON(任务书字段)',
-  `payload_json` LONGTEXT NULL COMMENT '事件负载JSON(M11a 写路径列名,与 payload 同义留宽)',
-  `causation_id` VARCHAR(64) NOT NULL DEFAULT '' COMMENT '因果链:引发本事件的事件UID',
-  `seq` BIGINT NOT NULL DEFAULT 0 COMMENT '会话内单调序号(轮询游标,应用层生成)',
-  `seq_no` BIGINT NOT NULL DEFAULT 0 COMMENT '会话内单调序号(M11a 写路径列名)',
-  `source` VARCHAR(32) NOT NULL DEFAULT 'runtime' COMMENT '来源:runtime/agent/script/client_intent',
-  `state` VARCHAR(16) NOT NULL DEFAULT 'applied' COMMENT 'applied/rejected/rolled_back',
-  `state_version` BIGINT NOT NULL DEFAULT 0 COMMENT '本事件推进到的服务端权威版本',
-  `tx_group` VARCHAR(64) NOT NULL DEFAULT '' COMMENT '事务组(同组同事务)',
-  `broadcast` TINYINT NOT NULL DEFAULT 1 COMMENT '是否参与广播 0/1',
-  `created_by` BIGINT NOT NULL DEFAULT 0 COMMENT '创建人',
-  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间(分区键,禁TIMESTAMP)',
-  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '记录时间戳(append-only:永不 UPDATE)',
-  `occurred_at` DATETIME NULL COMMENT '兼容列(M11a 旧分区键,新写入可空)',
-  PRIMARY KEY (`id`, `created_at`),
-  UNIQUE KEY `uk_event_uid` (`tenant_id`, `event_uid`, `created_at`),
-  UNIQUE KEY `uk_tenant_idem` (`tenant_id`, `idem_key`, `created_at`),
-  KEY `ix_scene_created` (`scene_id`, `created_at`),
-  KEY `ix_tenant_session_seq` (`tenant_id`, `session_id`, `seq`),
-  KEY `ix_tenant_session_seqno` (`tenant_id`, `session_id`, `seq_no`),
-  KEY `ix_tenant_world_type` (`tenant_id`, `world_id`, `event_type`),
+  `id` BIGINT NOT NULL AUTO_INCREMENT,
+  `tenant_id` VARCHAR(32) NOT NULL,
+  `event_uid` VARCHAR(64) NOT NULL,
+  `session_id` VARCHAR(64) NOT NULL DEFAULT '',
+  `world_id` VARCHAR(64) NOT NULL DEFAULT '',
+  `scene_id` VARCHAR(64) NOT NULL DEFAULT '',
+  `actor_id` VARCHAR(64) NOT NULL DEFAULT '',
+  `event_type` VARCHAR(64) NOT NULL DEFAULT '',
+  `event_code` VARCHAR(64) NOT NULL DEFAULT '',
+  `idem_key` VARCHAR(128) NOT NULL DEFAULT '',
+  `entity_id` VARCHAR(64) NOT NULL DEFAULT '',
+  `payload` TEXT,
+  `payload_json` LONGTEXT,
+  `seq` BIGINT NOT NULL DEFAULT 0,
+  `seq_no` BIGINT NOT NULL DEFAULT 0,
+  `source` VARCHAR(32) NOT NULL DEFAULT '',
+  `state` VARCHAR(32) NOT NULL DEFAULT '',
+  `tx_group` VARCHAR(64) NOT NULL DEFAULT '',
+  `broadcast` VARCHAR(16) NOT NULL DEFAULT '',
+  `causation_id` VARCHAR(64) NOT NULL DEFAULT '',
+  `state_version` BIGINT NOT NULL DEFAULT 0,
+  `created_by` VARCHAR(64) NOT NULL DEFAULT '',
+  `occurred_at` DATETIME NULL,
+  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`,`created_at`),
+  UNIQUE KEY `uk_event_uid` (`tenant_id`,`event_uid`,`created_at`),
+  UNIQUE KEY `uk_tenant_idem` (`tenant_id`,`idem_key`,`created_at`),
+  KEY `ix_tenant_session_seq` (`tenant_id`,`session_id`,`seq`),
+  KEY `ix_tenant_session_seqno` (`tenant_id`,`session_id`,`seq_no`),
+  KEY `ix_tenant_world_type` (`tenant_id`,`world_id`,`event_type`),
+  KEY `ix_scene_created` (`scene_id`,`created_at`),
   KEY `ix_tx_group` (`tx_group`),
   KEY `ix_created_at` (`created_at`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
-  COMMENT='运行时事件流(append-only,按月RANGE分区,保留14个月)' 
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
 PARTITION BY RANGE COLUMNS(`created_at`) (
   PARTITION `p202609` VALUES LESS THAN (DATE '2026-10-01'),
   PARTITION `p202610` VALUES LESS THAN (DATE '2026-11-01'),