diff --git a/db.mjs b/db.mjs
index a371908..11356b2 100644
--- a/db.mjs
+++ b/db.mjs
@@ -224,7 +224,7 @@ export async function migrateSchema(pool) {
       source_session_id VARCHAR(128) NULL,
       source_user_id CHAR(36) NULL,
       use_count BIGINT NOT NULL DEFAULT 0,
-      embedding JSON NULL,
+      \`embedding\` JSON NULL,
       created_at BIGINT NOT NULL,
       updated_at BIGINT NOT NULL,
       KEY idx_h5_experience_scope_updated (scope, updated_at),
diff --git a/schema.sql b/schema.sql
index bd1976d..3b97471 100644
--- a/schema.sql
+++ b/schema.sql
@@ -1014,7 +1014,7 @@ CREATE TABLE IF NOT EXISTS h5_blocked_words (
 
 -- Shared experience store (etat C): all goosed Worker instances read/write the
 -- same learned experience so capability is not siloed per instance. Built on
--- MySQL first with a keyword + recency retrieval; `embedding` is reserved for a
+-- MySQL first with keyword + recency retrieval. `embedding` is reserved for a
 -- later move to PostgreSQL + pgvector without changing the calling contract.
 CREATE TABLE IF NOT EXISTS h5_experience (
   id CHAR(36) PRIMARY KEY,
@@ -1026,7 +1026,7 @@ CREATE TABLE IF NOT EXISTS h5_experience (
   source_session_id VARCHAR(128) NULL,
   source_user_id CHAR(36) NULL,
   use_count BIGINT NOT NULL DEFAULT 0,
-  embedding JSON NULL,
+  `embedding` JSON NULL,
   created_at BIGINT NOT NULL,
   updated_at BIGINT NOT NULL,
   KEY idx_h5_experience_scope_updated (scope, updated_at),
diff --git a/wechat-mp.test.mjs b/wechat-mp.test.mjs
index 7f6d036..318deee 100644
--- a/wechat-mp.test.mjs
+++ b/wechat-mp.test.mjs
@@ -1312,7 +1312,6 @@ test('wechat mp service recreates poisoned dedicated session after bare completi
   assert.match(payload.text.content, /已完成/);
   assert.match(payload.text.content, /页面生成未完成|hello\.html/);
 });
-
 test('wechat mp service blocks schedule confirmation when no schedule item was written', async () => {
   const token = 'token';
   const timestamp = '1710000000';