Fix Gate/Binance memory regression and roll stop offset from avg.

Stop fetch_tickers fallback for volume rank and keep stale cache on failed refresh. Compute roll unified stop as merge-average plus offset percent instead of break-even.

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

strategy_roll_monitor_lib.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 from typing import Any, Optional
 
 from fib_key_monitor_lib import fib_invalidate_by_mark
+from strategy_roll_lib import unified_stop_from_avg
 from strategy_db import init_strategy_tables
 
 ROLL_LEG_STATUS_LABELS = {
@@ -218,11 +219,31 @@ def _finalize_roll_leg_fill(
     leg_id = int(leg["id"])
     gid = int(group["id"])
     new_sl = float(leg.get("new_stop_loss") or 0)
+    stop_offset_pct = leg.get("stop_offset_pct")
     tp0 = float(group.get("initial_take_profit") or 0)
     fill_px = float(leg.get("limit_price") or mark)
+    add_qty = float(leg.get("amount") or 0)
+    if stop_offset_pct not in (None, ""):
+        try:
+            offset_pct = float(stop_offset_pct)
+        except (TypeError, ValueError):
+            offset_pct = 0.0
+        if offset_pct > 0:
+            pos = cfg["get_position"](ex_sym, direction) or {}
+            avg = float(pos.get("entry_price") or 0)
+            if avg <= 0 and add_qty > 0:
+                avg = fill_px
+            if avg > 0:
+                new_sl = unified_stop_from_avg(direction, avg, offset_pct)
+                px_fn = cfg.get("price_to_precision")
+                if callable(px_fn):
+                    try:
+                        new_sl = float(px_fn(ex_sym, new_sl) or new_sl)
+                    except Exception:
+                        pass
     conn.execute(
-        "UPDATE roll_legs SET status='filled', fill_price=? WHERE id=? AND status='pending'",
-        (fill_px, leg_id),
+        "UPDATE roll_legs SET status='filled', fill_price=?, new_stop_loss=? WHERE id=? AND status='pending'",
+        (fill_px, new_sl, leg_id),
     )
     if new_sl > 0:
         conn.execute(