diff --git a/backend/src/services/postgresVectorImageContract.test.ts b/backend/src/services/postgresVectorImageContract.test.ts
new file mode 100644
index 0000000..6c416ca
--- /dev/null
+++ b/backend/src/services/postgresVectorImageContract.test.ts
@@ -0,0 +1,7 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+import test from 'node:test';
+const compose=fs.readFileSync(new URL('../../../docker-compose.yml',import.meta.url),'utf8');
+test('database image includes the vector extension required by existing production schema and backups',()=>{
+  assert.match(compose,/image: pgvector\/pgvector@sha256:[a-f0-9]{64}/);
+});
diff --git a/docker-compose.yml b/docker-compose.yml
index f0afdf8..1f89c4b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -142,7 +142,7 @@ services:
 
   # 数据库
   postgres:
-    image: postgres@sha256:57c72fd2a128e416c7fcc499958864df5301e940bca0a56f58fddf30ffc07777
+    image: pgvector/pgvector@sha256:1e4956185a7fd9306a41ee759a7b4329c4faf9a2bb91a1d01437310c97002433
     container_name: tg-vault-postgres
     environment:
       - POSTGRES_DB=tgvault