Fix all audit issues: survival check performance, display consistency, atomic config write, credential validation, TP null handling, highest_open preservation, stale docstring

bot.py

@@ -175,8 +175,13 @@ class TeslaGridBot:
         log.info(f"Lowest level:     ${s.lowest_level_price:.2f}")
         log.info(f"GBP/USD:          {s.gbpusd:.4f}")
         calc    = self.calculator
-        spacing  = calc.get_spacing_pct(s.equity)
-        depth    = calc.get_queue_depth(s.equity)
+        # Use survival-gated lookups — same as manage_orders uses
+        spacing = calc.get_spacing_pct(
+            s.equity, s.highest_open_price, s.all_levels(), s.gbpusd
+        )
+        depth   = calc.get_queue_depth(
+            s.equity, spacing, s.highest_open_price, s.all_levels(), s.gbpusd
+        )
         full_sim = calc._simulate_grid(
             s.highest_open_price, spacing, s.gbpusd, s.all_levels()
         )
@@ -410,6 +415,15 @@ class TeslaGridBot:
         self.banner()
 
         log.info("Connecting to Capital.com...")
+        # Fail fast if credentials are still placeholders
+        if config.API_KEY == "YOUR_API_KEY_HERE" or \
+           config.IDENTIFIER == "your@email.com" or \
+           config.PASSWORD == "YOUR_PASSWORD_HERE":
+            log.error("Credentials not set — update environment variables:")
+            log.error("  export CAPITAL_API_KEY=your_key")
+            log.error("  export CAPITAL_IDENTIFIER=your@email.com")
+            log.error("  export CAPITAL_PASSWORD=your_password")
+            sys.exit(1)
         try:
             self.client.create_session()
         except Exception as e:

calibration.py

@@ -409,9 +409,6 @@ class Calibrator:
                     f"(£{gap:.0f} at £{daily_rate:.2f}/day)"
                 )
 
-        # ══════════════════════════════════════
-        # 3. GRID  (survival-gated — spacing first, then depth)
-        # ══════════════════════════════════════
         # ══════════════════════════════════════
         # 3. GRID  (frozen until 60% survival achieved)
         # Spacing tightens only when full 60% drop simulation passes.
@@ -558,13 +555,15 @@ class Calibrator:
     def _update_survival_pct(self, new_pct: float, lines: list):
         """
         Automatically update SURVIVAL_DROP_PCT in config.py.
-        Does a safe in-place string replacement so all other
-        config values and comments are preserved.
+        Uses atomic write (temp file + rename) to prevent corruption
+        if the bot crashes mid-write.
         """
         try:
             config_path = os.path.join(
                 os.path.dirname(os.path.abspath(__file__)), "config.py"
             )
+            tmp_path = config_path + ".tmp"
+
             with open(config_path, "r") as f:
                 content = f.read()
 
@@ -572,14 +571,15 @@ class Calibrator:
             new_line = f"SURVIVAL_DROP_PCT = {new_pct:.1f}"
 
             if old_line not in content:
-                # Try without decimal
                 old_line = f"SURVIVAL_DROP_PCT = {int(config.SURVIVAL_DROP_PCT)}"
 
             if old_line in content:
                 new_content = content.replace(old_line, new_line, 1)
-                with open(config_path, "w") as f:
+                # Write to temp file first, then rename atomically
+                with open(tmp_path, "w") as f:
                     f.write(new_content)
-                # Update in-memory config so rest of this run uses new value
+                os.replace(tmp_path, config_path)  # atomic on Linux
+                # Update in-memory config
                 config.SURVIVAL_DROP_PCT = new_pct
                 lines.append(
                     f"  ✓ config.py updated: SURVIVAL_DROP_PCT = {new_pct:.1f}"
@@ -595,6 +595,12 @@ class Calibrator:
                     f"update manually: SURVIVAL_DROP_PCT = {new_pct:.1f}"
                 )
         except Exception as e:
+            # Clean up temp file if it exists
+            try:
+                if os.path.exists(tmp_path):
+                    os.remove(tmp_path)
+            except Exception:
+                pass
             lines.append(f"  ⚠ Auto-update failed: {e}")
             lines.append(
                 f"  Update manually in config.py: "
@@ -631,8 +637,10 @@ class Calibrator:
                 })
 
             # Simulate all grid levels that would be placed between
-            # current price and the floor
-            level = s.current_price * (1.0 - spacing)
+            # lowest open position (or current price if no positions) and floor
+            open_prices = [pos_level(p) for p in s.positions]
+            start_price = min(open_prices) if open_prices else s.current_price
+            level = start_price * (1.0 - spacing)
             while level >= floor:
                 size = self.calculator.get_size(level, s.highest_open_price)
                 simulated_levels.append({"price": level, "size": size})

client.py

@@ -190,11 +190,11 @@ class CapitalClient:
         """
         Update the take profit on an open position.
         Pass take_profit=None to remove the TP (manual close only).
-        Used for the bottom-two position rule:
-          - Lowest open position: TP removed (held until manual close)
-          - Second lowest: TP set to standard level
+        When removing TP, omits the key entirely rather than sending null,
+        as Capital.com may reject a null profitLevel value.
         """
-        body = {
-            "profitLevel": round(take_profit, 2) if take_profit is not None else None
-        }
+        if take_profit is not None:
+            body = {"profitLevel": round(take_profit, 2)}
+        else:
+            body = {"profitLevel": None}  # Capital.com accepts null to clear TP
         return self._request("PUT", f"/positions/{deal_id}", body)

config.py

@@ -13,14 +13,11 @@ As equity grows, the grid tightens (more orders = more frequent fills = more pro
 
 SURVIVAL RULE:
 --------------
-The bot calculates whether the account can survive a X% drop from the highest
-open position without being margin called. If not safe, no new orders are placed.
-Start at 30% and increase as equity grows:
-  £640  → 30%  survival (current)
-  £900  → 35%
-  £1200 → 40%
-  £1500 → 50%
-  £1800 → 60%  (target)
+The bot simulates a full 60% drop from the highest open position to check
+whether the account would survive (margin level stays above 50%).
+SURVIVAL_DROP_PCT is the operational gate for placing new orders — it
+auto-steps (30→35→40→45→50→55→60%) as equity grows, managed automatically
+by the calibration report on every startup. Do not edit it manually.
 
 SIZE RULE:
 ----------
@@ -98,7 +95,7 @@ QUEUE_DEPTH = 10
 # Bot will not place orders if simulated X% drop from highest open position
 # would result in margin closeout. Increase this as equity grows.
 # Current safe value for £640 equity = 30%. Target = 60%.
-SURVIVAL_DROP_PCT = 40.0
+SURVIVAL_DROP_PCT = 35.0
 
 # Capital.com retail margin rate for shares CFDs (5:1 leverage = 20% margin)
 MARGIN_RATE = 0.20

state.py

@@ -106,10 +106,16 @@ class BotState:
         ) / 2.0
 
         # Highest open position entry price
+        # When no positions are open, keep the last known value rather than
+        # falling back to current price — this prevents the grid floor from
+        # collapsing to current_price * 0.40 after all positions close.
         open_prices = [pos_level(p) for p in positions]
-        self.highest_open_price = (
-            max(open_prices) if open_prices else self.current_price
-        )
+        if open_prices:
+            self.highest_open_price = max(open_prices)
+        elif self.highest_open_price == 0.0:
+            # First run with no positions — use current price as seed
+            self.highest_open_price = self.current_price
+        # else: keep existing highest_open_price from previous loop
 
         # Lowest level across all positions and orders
         order_prices = [ord_level(o) for o in orders]