fix(HEL-482): 开盘前分时回退最近交易日，并接通中枢失败回旧通道

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

xiaobai-datahub/datahub/realtime_serve.py

@@ -14,6 +14,7 @@ from datahub.adapters.eastmoney import EastmoneyAdapter
 from datahub.adapters.tencent import TencentAdapter
 from datahub.codes import resolve_code
 from datahub.db import HubDB
+from datahub.governance.lkg import LastKnownGood
 from datahub.timeutil import isoformat, now_shanghai, yyyymmdd
 
 QUOTE_TTL = 60
@@ -108,10 +109,13 @@ def fetch_intraday(db: HubDB, code: str, date: str = "") -> dict[str, Any]:
         return cached
     adapter = EastmoneyAdapter()
     try:
-        payload_data = adapter.fetch_intraday(ts_code)
+        payload_data = adapter.fetch_intraday(ts_code, date)
         source = "eastmoney:trends2"
     except Exception as exc:
-        raise RealtimeApiError("SOURCE_UNAVAILABLE", f"intraday unavailable: {exc}") from exc
+        recovered = _load_intraday_lkg(db, ts_code, date)
+        if recovered is None:
+            raise RealtimeApiError("SOURCE_UNAVAILABLE", f"intraday unavailable: {exc}") from exc
+        return recovered
     payload = _envelope(
         payload_data,
         {
@@ -127,6 +131,47 @@ def fetch_intraday(db: HubDB, code: str, date: str = "") -> dict[str, Any]:
     return payload
 
 
+def _load_intraday_lkg(db: HubDB, ts_code: str, date: str = "") -> dict[str, Any] | None:
+    store = LastKnownGood(db)
+    keys = [f"intraday:{ts_code}:{date or 'today'}"]
+    if date:
+        keys.append(f"intraday:{ts_code}:today")
+    for key in keys:
+        item = store.load(key)
+        payload = _lkg_payload(item)
+        if payload is not None:
+            return payload
+    row = db.fetchone(
+        "SELECT * FROM last_known_good WHERE cache_key LIKE ? ORDER BY stored_at DESC LIMIT 1",
+        (f"intraday:{ts_code}:%",),
+    )
+    if not row:
+        return None
+    try:
+        raw = json.loads(row["payload"])
+    except json.JSONDecodeError:
+        return None
+    return _mark_stale(raw) if isinstance(raw, dict) else None
+
+
+def _lkg_payload(item: dict[str, Any] | None) -> dict[str, Any] | None:
+    if not item:
+        return None
+    payload = item.get("payload")
+    return _mark_stale(payload) if isinstance(payload, dict) else None
+
+
+def _mark_stale(payload: dict[str, Any]) -> dict[str, Any] | None:
+    data = payload.get("data")
+    if not isinstance(data, dict) or not data.get("points"):
+        return None
+    stamped = dict(payload)
+    meta = dict(stamped.get("meta") or {})
+    meta["stale"] = True
+    stamped["meta"] = meta
+    return stamped
+
+
 def _guess_ts_code(code: str) -> str | None:
     raw = str(code or "").strip().upper()
     if "." in raw: