feat: add min hours-to-expiry filter on ops map (8-48h step 2)

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/domain/expiry_filter.py

@@ -0,0 +1,32 @@
+"""按采样时刻距离到期时长过滤行情样本。"""
+
+from __future__ import annotations
+
+from typing import Any, Iterable
+
+from packages.domain.expiry import expiry_ms_from_ymd
+
+
+def hours_to_expiry_at(ts_ms: int, expiry_ymd: str) -> float | None:
+    try:
+        ems = expiry_ms_from_ymd(str(expiry_ymd))
+    except ValueError:
+        return None
+    return (ems - int(ts_ms)) / 3_600_000.0
+
+
+def filter_rows_min_hours_to_expiry(
+    rows: Iterable[dict[str, Any]],
+    *,
+    min_hours: float,
+) -> list[dict[str, Any]]:
+    """保留采样时距到期 ≥ min_hours 的样本。"""
+    out: list[dict[str, Any]] = []
+    mh = float(min_hours)
+    for r in rows:
+        h = hours_to_expiry_at(int(r.get("ts_ms") or 0), str(r.get("expiry_ymd") or ""))
+        if h is None:
+            continue
+        if h >= mh:
+            out.append(r)
+    return out