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app.py

@@ -176,7 +176,8 @@ def rebalance_preview():
         acct = ac.get_account()
         eq = float(acct["equity"])
         positions = {p["symbol"]: float(p["market_value"]) for p in ac.get_positions()}
-        orders = eng.compute_orders(tgt["weights"], positions, eq)
+        orders = eng.compute_orders(tgt["weights"], positions, eq,
+                                    force_sells=float(acct.get("cash", 0)) < 0)
     except Exception as e:
         return f"### ⚠️ Could not build preview\n`{type(e).__name__}: {str(e)[:180]}`", pd.DataFrame(), pd.DataFrame()
     reg = tgt["regime"]

rebalance_engine.py

@@ -89,13 +89,17 @@ def get_target(token):
     return {"regime": reg, "weights": weights, "rows": rows}
 
 
-def compute_orders(weights, positions, equity, band_pct=0.005):
-    """positions: {symbol: market_value $}. Returns order list (sells first), trading only the delta."""
+def compute_orders(weights, positions, equity, band_pct=0.005, invest_frac=0.995, force_sells=False):
+    """positions: {symbol: market_value $}. Returns order list (sells first), trading only the delta.
+    invest_frac keeps a ~0.5% cash buffer so sell-proceeds slippage can't push cash negative (no margin).
+    force_sells (set when cash < 0): sell deltas bypass the band so a thin ~5% overshoot spread across
+    50 names can actually be trimmed back — otherwise every per-name trim is under the band."""
     band = band_pct * equity
+    investable = equity * invest_frac
     orders = []
     for sym in set(weights) | set(positions):
         tw = weights.get(sym, 0.0)
-        tgt = tw * equity
+        tgt = tw * investable
         cur = positions.get(sym, 0.0)
         delta = tgt - cur
         cw = (cur / equity) if equity else 0.0
@@ -103,6 +107,8 @@ def compute_orders(weights, positions, equity, band_pct=0.005):
             orders.append({"symbol": sym, "side": "SELL", "delta": -cur, "cur_w": cw, "tgt_w": 0.0, "exit": True})
         elif cur == 0 and tgt > 1.0:                               # establish a new target position (always; band can't block it)
             orders.append({"symbol": sym, "side": "BUY", "delta": tgt, "cur_w": 0.0, "tgt_w": tw, "exit": False})
+        elif force_sells and delta < -1.0:                         # de-leverage: trims bypass the band
+            orders.append({"symbol": sym, "side": "SELL", "delta": delta, "cur_w": cw, "tgt_w": tw, "exit": False})
         elif abs(delta) < band:                                    # churn guard: skip small adjustments to EXISTING positions
             continue
         else: