diff --git a/README.md b/README.md
index 2410247..7d98364 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,10 @@
   - 如果数据库最新交易日已经是当天，则跳过。
   - 如果发现最近工作日数据缺失，会尝试自动补齐并重新生成预警。
   - 检查失败不会阻塞 API 启动，避免服务不可用。
+- 后端服务内置收盘后调度：
+  - 工作日 17:00 之后会自动尝试执行收盘后更新。
+  - 如果 17:00 时数据源尚未准备好，会按固定间隔重试，直到当天数据补齐。
+  - 本地和服务器使用同一套调度逻辑，不再依赖本机 Codex 自动任务。
 
 ## 环境要求
 
diff --git a/backend/scripts/after_market_update.py b/backend/scripts/after_market_update.py
index 981a4b6..4c79596 100644
--- a/backend/scripts/after_market_update.py
+++ b/backend/scripts/after_market_update.py
@@ -2,20 +2,12 @@ from __future__ import annotations
 
 import argparse
 from datetime import datetime
-from zoneinfo import ZoneInfo
 
 from _bootstrap import add_src_to_path
 
 add_src_to_path()
 
-from lhbfx.config import load_config
-from lhbfx.mailer import send_email
-from lhbfx.pdf_export import generate_daily_report_pdf
-from lhbfx.pipeline import generate_warnings, import_daily, rematch_traders
-from lhbfx.reporting import build_daily_report, build_email_body, default_report_output_path
-
-
-SHANGHAI_TZ = ZoneInfo("Asia/Shanghai")
+from lhbfx.after_market import SHANGHAI_TZ, default_trade_date, run_after_market_update
 
 
 def parse_args() -> argparse.Namespace:
@@ -25,91 +17,28 @@ def parse_args() -> argparse.Namespace:
     parser.add_argument("--force", action="store_true", help="Run even if the target date is not a weekday")
     return parser.parse_args()
 
-
-def default_trade_date() -> str:
-    return datetime.now(SHANGHAI_TZ).date().isoformat()
-
-
 def is_weekday(trade_date: str) -> bool:
     return datetime.fromisoformat(trade_date).weekday() < 5
 
 
-def build_update_email_body(
-    *,
-    trade_date: str,
-    overview_count: int,
-    detail_count: int,
-    rematch_updated: int,
-    warning_total: int,
-    report_body: str,
-) -> str:
-    lines = [
-        f"lhbfx 收盘后更新完成 - {trade_date}",
-        "",
-        f"龙虎榜概览更新数: {overview_count}",
-        f"席位明细更新数: {detail_count}",
-        f"游资重新匹配数: {rematch_updated}",
-        f"预警总数: {warning_total}",
-        "",
-    ]
-    lines.append(report_body)
-    return "\n".join(lines)
-
-
 def main() -> None:
     args = parse_args()
-    config = load_config()
     trade_date = args.trade_date or default_trade_date()
 
     if not args.force and not is_weekday(trade_date):
         print(f"Skip {trade_date}: not a weekday, assumed non-trading day.")
         return
 
-    import_result = import_daily(trade_date, config=config)
-    if import_result.overview_count <= 0:
-        print(f"Skip {trade_date}: no overview rows imported, source data may not be ready or market may be closed.")
+    result = run_after_market_update(
+        trade_date=trade_date,
+        send_report_email=args.send_email,
+        force=args.force,
+    )
+    if result["status"] == "skipped":
+        print(f"Skip {trade_date}: {result['reason']}")
         return
 
-    rematch_result = rematch_traders(config=config)
-    warning_result = generate_warnings(config=config)
-
-    report = build_daily_report(config=config, trade_date=trade_date)
-    pdf_path = default_report_output_path(trade_date)
-    generate_daily_report_pdf(report, pdf_path)
-
-    print(
-        "After-market update finished:",
-        {
-            "trade_date": trade_date,
-            "overview_count": import_result.overview_count,
-            "detail_count": import_result.detail_count,
-            "rematch_updated": rematch_result["updated"],
-            "warning_total": warning_result["total"],
-            "pdf_path": str(pdf_path),
-        },
-    )
-
-    if args.send_email:
-        if config.mail is None:
-            raise RuntimeError("Mail config is missing")
-
-        report_body = build_email_body(report)
-        body_text = build_update_email_body(
-            trade_date=trade_date,
-            overview_count=import_result.overview_count,
-            detail_count=import_result.detail_count,
-            rematch_updated=rematch_result["updated"],
-            warning_total=warning_result["total"],
-            report_body=report_body,
-        )
-        subject = f"lhbfx 收盘后更新完成 - {trade_date}"
-        send_email(
-            mail_config=config.mail,
-            subject=subject,
-            body_text=body_text,
-            attachments=[pdf_path],
-        )
-        print(f"Email sent to: {', '.join(config.mail.recipients)}")
+    print("After-market update finished:", result)
 
 
 if __name__ == "__main__":
diff --git a/backend/src/lhbfx/after_market.py b/backend/src/lhbfx/after_market.py
new file mode 100644
index 0000000..89e6e11
--- /dev/null
+++ b/backend/src/lhbfx/after_market.py
@@ -0,0 +1,113 @@
+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any
+from zoneinfo import ZoneInfo
+
+from .config import AppConfig, load_config
+from .mailer import send_email
+from .pdf_export import generate_daily_report_pdf
+from .pipeline import generate_warnings, import_daily, rematch_traders
+from .reporting import build_daily_report, build_email_body, default_report_output_path
+
+
+SHANGHAI_TZ = ZoneInfo("Asia/Shanghai")
+
+
+def default_trade_date() -> str:
+    return datetime.now(SHANGHAI_TZ).date().isoformat()
+
+
+def is_weekday(trade_date: str) -> bool:
+    return datetime.fromisoformat(trade_date).weekday() < 5
+
+
+def build_update_email_body(
+    *,
+    trade_date: str,
+    overview_count: int,
+    detail_count: int,
+    rematch_updated: int,
+    warning_total: int,
+    report_body: str,
+) -> str:
+    lines = [
+        f"lhbfx 收盘后更新完成 - {trade_date}",
+        "",
+        f"龙虎榜概览更新数: {overview_count}",
+        f"席位明细更新数: {detail_count}",
+        f"游资重新匹配数: {rematch_updated}",
+        f"预警总数: {warning_total}",
+        "",
+    ]
+    lines.append(report_body)
+    return "\n".join(lines)
+
+
+def run_after_market_update(
+    *,
+    config: AppConfig | None = None,
+    trade_date: str | None = None,
+    send_report_email: bool = False,
+    force: bool = False,
+) -> dict[str, Any]:
+    cfg = config or load_config()
+    effective_trade_date = trade_date or default_trade_date()
+
+    if not force and not is_weekday(effective_trade_date):
+        return {
+            "status": "skipped",
+            "reason": "weekend",
+            "trade_date": effective_trade_date,
+        }
+
+    import_result = import_daily(effective_trade_date, config=cfg)
+    if import_result.overview_count <= 0:
+        return {
+            "status": "skipped",
+            "reason": "no_data",
+            "trade_date": effective_trade_date,
+            "overview_count": import_result.overview_count,
+            "detail_count": import_result.detail_count,
+        }
+
+    rematch_result = rematch_traders(config=cfg)
+    warning_result = generate_warnings(config=cfg)
+
+    report = build_daily_report(config=cfg, trade_date=effective_trade_date)
+    pdf_path = default_report_output_path(effective_trade_date)
+    generate_daily_report_pdf(report, pdf_path)
+
+    emailed = False
+    if send_report_email:
+        if cfg.mail is None:
+            raise RuntimeError("Mail config is missing")
+
+        report_body = build_email_body(report)
+        body_text = build_update_email_body(
+            trade_date=effective_trade_date,
+            overview_count=import_result.overview_count,
+            detail_count=import_result.detail_count,
+            rematch_updated=rematch_result["updated"],
+            warning_total=warning_result["total"],
+            report_body=report_body,
+        )
+        subject = f"lhbfx 收盘后更新完成 - {effective_trade_date}"
+        send_email(
+            mail_config=cfg.mail,
+            subject=subject,
+            body_text=body_text,
+            attachments=[pdf_path],
+        )
+        emailed = True
+
+    return {
+        "status": "completed",
+        "trade_date": effective_trade_date,
+        "overview_count": import_result.overview_count,
+        "detail_count": import_result.detail_count,
+        "rematch_updated": rematch_result["updated"],
+        "warning_total": warning_result["total"],
+        "pdf_path": str(pdf_path),
+        "emailed": emailed,
+    }
diff --git a/backend/src/lhbfx/app.py b/backend/src/lhbfx/app.py
index aabd4fa..16d3d25 100644
--- a/backend/src/lhbfx/app.py
+++ b/backend/src/lhbfx/app.py
@@ -28,6 +28,7 @@ from .queries import (
     delete_watchlist_item,
     upsert_watchlist_item,
 )
+from .scheduler import start_after_market_scheduler
 
 
 BASE_DIR = Path(__file__).resolve().parents[2]
@@ -58,6 +59,11 @@ def startup_check_recent_data() -> None:
     except Exception:
         logger.exception("startup data check failed")
 
+    try:
+        start_after_market_scheduler()
+    except Exception:
+        logger.exception("after-market scheduler startup failed")
+
 
 @app.get("/api/summary")
 def api_summary():
diff --git a/backend/src/lhbfx/scheduler.py b/backend/src/lhbfx/scheduler.py
new file mode 100644
index 0000000..87c12fd
--- /dev/null
+++ b/backend/src/lhbfx/scheduler.py
@@ -0,0 +1,79 @@
+from __future__ import annotations
+
+import logging
+import threading
+import time
+from datetime import datetime
+from typing import Any
+
+from .after_market import SHANGHAI_TZ, run_after_market_update
+from .config import AppConfig, load_config
+from .pipeline import get_latest_imported_trade_date
+
+
+logger = logging.getLogger(__name__)
+_scheduler_thread: threading.Thread | None = None
+_scheduler_started = False
+_scheduler_lock = threading.Lock()
+
+
+def _should_attempt_update(*, config: AppConfig, now: datetime) -> tuple[bool, str]:
+    if now.weekday() >= 5:
+        return False, "weekend"
+    if now.hour < 17:
+        return False, "before_after_market_window"
+
+    latest_trade_date = get_latest_imported_trade_date(config=config)
+    if latest_trade_date and latest_trade_date >= now.date().isoformat():
+        return False, "up_to_date"
+
+    return True, "missing_today_data"
+
+
+def _scheduler_loop(config: AppConfig, poll_interval_seconds: int, retry_interval_seconds: int) -> None:
+    last_attempt_at: float = 0
+    while True:
+        try:
+            now = datetime.now(SHANGHAI_TZ)
+            should_attempt, reason = _should_attempt_update(config=config, now=now)
+            if should_attempt:
+                current_time = time.time()
+                if current_time - last_attempt_at >= retry_interval_seconds:
+                    last_attempt_at = current_time
+                    result = run_after_market_update(
+                        config=config,
+                        trade_date=now.date().isoformat(),
+                        send_report_email=True,
+                    )
+                    logger.info("after-market scheduler result: %s", result)
+            else:
+                logger.debug("after-market scheduler idle: %s", reason)
+        except Exception:
+            logger.exception("after-market scheduler iteration failed")
+
+        time.sleep(poll_interval_seconds)
+
+
+def start_after_market_scheduler(
+    *,
+    config: AppConfig | None = None,
+    poll_interval_seconds: int = 300,
+    retry_interval_seconds: int = 900,
+) -> threading.Thread | None:
+    global _scheduler_thread, _scheduler_started
+
+    with _scheduler_lock:
+        if _scheduler_started:
+            return _scheduler_thread
+
+        cfg = config or load_config()
+        _scheduler_thread = threading.Thread(
+            target=_scheduler_loop,
+            args=(cfg, poll_interval_seconds, retry_interval_seconds),
+            name="lhbfx-after-market-scheduler",
+            daemon=True,
+        )
+        _scheduler_thread.start()
+        _scheduler_started = True
+        logger.info("after-market scheduler started")
+        return _scheduler_thread