diff --git a/.github/workflows/_container.yml b/.github/workflows/_container.yml
index 6c7366be4..f6f494266 100644
--- a/.github/workflows/_container.yml
+++ b/.github/workflows/_container.yml
@@ -122,6 +122,8 @@ jobs:
           compose=(docker compose --project-name "$COMPOSE_PROJECT_NAME" \
             -f deploy/docker-compose.yml -f deploy/docker-compose.smoke.yml)
           "${compose[@]}" up -d --no-build --wait postgres redis
+          test "$("${compose[@]}" exec -T -e PGPASSWORD="$CPR_POSTGRES_PASSWORD" postgres \
+            psql -At -U codex_proxy -d codex_proxy -c "SHOW TimeZone;" | tr -d '\r')" = Asia/Shanghai
           "${compose[@]}" exec -T -e PGPASSWORD="$CPR_POSTGRES_PASSWORD" postgres \
             psql -v ON_ERROR_STOP=1 -U codex_proxy -d codex_proxy -c \
             "CREATE TABLE cpr_ci_persistence_probe (value text PRIMARY KEY); INSERT INTO cpr_ci_persistence_probe VALUES ('persisted');"
@@ -151,6 +153,8 @@ jobs:
           test "$status" = 204
           test "$("${compose[@]}" exec -T codex-proxy-rs id -u | tr -d '\r')" = 10001
           test "$("${compose[@]}" exec -T codex-proxy-rs id -g | tr -d '\r')" = 10001
+          test "$("${compose[@]}" exec -T codex-proxy-rs date +%z | tr -d '\r')" = +0800
+          test "$("${compose[@]}" exec -T codex-proxy-rs cat /etc/timezone | tr -d '\r')" = Asia/Shanghai
           "${compose[@]}" exec -T codex-proxy-rs sh -c \
             'touch /app/data/.ci-write /app/logs/.ci-write && rm /app/data/.ci-write /app/logs/.ci-write'
 
diff --git a/deploy/Dockerfile b/deploy/Dockerfile
index e79ca05a3..af3ea1b7b 100644
--- a/deploy/Dockerfile
+++ b/deploy/Dockerfile
@@ -51,8 +51,12 @@ COPY --from=release-asset-builder /out /
 
 FROM debian:bookworm-slim@sha256:60eac759739651111db372c07be67863818726f754804b8707c90979bda511df AS runtime-base
 
+ENV TZ=Asia/Shanghai
+
 RUN apt-get update \
-    && apt-get install -y --no-install-recommends ca-certificates curl \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends ca-certificates curl tzdata \
+    && ln -snf "/usr/share/zoneinfo/${TZ}" /etc/localtime \
+    && printf '%s\n' "${TZ}" > /etc/timezone \
     && groupadd --system --gid 10001 cpr \
     && useradd --system --uid 10001 --gid cpr --home-dir /app --shell /usr/sbin/nologin cpr \
     && install -d -o cpr -g cpr /app/bin /app/data /app/logs /app/web \
diff --git a/deploy/README.md b/deploy/README.md
index 2889ea4f3..2897396f0 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -26,6 +26,9 @@ chmod 0600 deploy/.env
 应用日志同时写入 `docker logs` 与 `.runtime/logs`。Compose 对应用、PostgreSQL、Redis
 统一启用 `json-file` 的 `10m × 5` 轮转；应用文件日志还受配置中的自然日、单文件大小和文件总数限制。
 
+Runtime 镜像和 PostgreSQL 的显示、日志时区固定为 `Asia/Shanghai`。PostgreSQL 时间列仍使用
+`timestamptz` 保存绝对时间点，修改时区只影响查询与日志的显示，不需要迁移或改写已有数据。
+
 `deploy/.env` 是 Docker 部署的密钥配置文件，已被 Git 忽略且必须保持 mode `0600`。其中
 `CPR_ADMIN_DEFAULT_PASSWORD`、`CPR_POSTGRES_PASSWORD`、`CPR_REDIS_PASSWORD` 三项均为必填，
 留空时 Compose 会在启动前失败。管理员密码必须至少 12 位且不能是常见弱口令。
diff --git a/deploy/docker-compose.yml b/deploy/docker-compose.yml
index 9b09fdb92..460c808a0 100644
--- a/deploy/docker-compose.yml
+++ b/deploy/docker-compose.yml
@@ -10,7 +10,16 @@ services:
   postgres:
     image: postgres:18-bookworm@sha256:d9c83446333daec3f0588cc709adb80c26090b7f9f0f7ec8d43c243385d79818
     restart: unless-stopped
+    command:
+      [
+        "postgres",
+        "-c",
+        "timezone=Asia/Shanghai",
+        "-c",
+        "log_timezone=Asia/Shanghai",
+      ]
     environment:
+      TZ: Asia/Shanghai
       POSTGRES_DB: codex_proxy
       POSTGRES_USER: codex_proxy
       POSTGRES_PASSWORD: ${CPR_POSTGRES_PASSWORD:?CPR_POSTGRES_PASSWORD must be set in deploy/.env}
diff --git a/docs/architecture.md b/docs/architecture.md
index f428ab831..06436e030 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -445,6 +445,8 @@ Responses 协议没有按事件序号续传未完成 response 的请求字段。
 
 PostgreSQL 是权威持久化存储。
 
+时间列统一使用 `timestamptz`，应用以 UTC 时间点读写。Compose 将 PostgreSQL 的会话显示时区和日志时区设为 `Asia/Shanghai`，因此直接查询时显示 `+08:00`；这不会改写已有数据，也不会改变数据库内部保存的绝对时间。API 输出、中国自然日统计和日志轮转仍由 `infra::time` 显式定义，不依赖宿主机时区。
+
 | 数据 | 表 |
 | --- | --- |
 | 管理员 | `admin_users` |