fix: harden post-stop reentry lockdown

app/services/paper_trade_service.py

@@ -20,6 +20,7 @@ from app.services.outcome_service import (
     Bar,
     evaluate_setup_against_bars,
 )
+from app.services.trade_policy import get_reentry_lockdowns
 
 # Exit policy for OPEN paper trades (auto-close). Production defaults to the
 # July 2026 promoted strategy: initial stop + 3x ATR trailing stop, with a max
@@ -318,6 +319,13 @@ async def create_trade(
         raise ValidationError("shares and entry_price must be positive")
 
     ticker = await _get_ticker(db, symbol)
+    remaining_sessions = (await get_reentry_lockdowns(db)).get(ticker.id)
+    if remaining_sessions is not None:
+        suffix = "session" if remaining_sessions == 1 else "sessions"
+        raise ValidationError(
+            f"{ticker.symbol} is in a post-stop re-entry lockdown: "
+            f"{remaining_sessions} market {suffix} remaining"
+        )
     trade = PaperTrade(
         user_id=user_id,
         ticker_id=ticker.id,