diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..d8e778f
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,22 @@
+# 本地开发/测试用 PostgreSQL。生产用原生 PG(scripts/init_postgres.py),不使用本文件。
+services:
+  postgres:
+    image: postgres:16-alpine
+    container_name: shaguabijia-pg
+    environment:
+      POSTGRES_USER: shaguabijia_app
+      POSTGRES_PASSWORD: shaguabijia_dev_pw
+      POSTGRES_DB: shaguabijia
+    ports:
+      - "5432:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+      - ./docker/initdb:/docker-entrypoint-initdb.d:ro
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U shaguabijia_app -d shaguabijia"]
+      interval: 3s
+      timeout: 3s
+      retries: 20
+
+volumes:
+  pgdata:
diff --git a/docker/initdb/01-create-test-db.sql b/docker/initdb/01-create-test-db.sql
new file mode 100644
index 0000000..440ecca
--- /dev/null
+++ b/docker/initdb/01-create-test-db.sql
@@ -0,0 +1,3 @@
+-- 仅在 pgdata 卷首次初始化时执行一次(以 shaguabijia_app 连 shaguabijia 库运行)。
+-- 幂等兜底见 scripts/ensure_pg.py 的 _ensure_test_db()。
+CREATE DATABASE shaguabijia_test OWNER shaguabijia_app;