fix: fan settings persistence, profile indicator, and point removal

Address three fan-settings issues:

1. Profile view: show a fan icon next to a profile's name when it has a
   saved fan curve, so it's clear which profiles carry custom fans.

2. Fan curve persistence: the active fan curve was in-memory only and lost
   on every server restart. It is now persisted per-GPU in
   /etc/nvcurve/config.json (fan_curves) and re-applied at server startup,
   so an applied curve survives restarts. All fan-curve state changes route
   through _activate_fan_curve/_deactivate_fan_curve helpers that keep the
   persisted state in sync (apply, reset, and profile apply).

3. Point removal: the fan-curve remove button was nearly invisible. The
   chart remove control is now always faintly visible with an X glyph, the
   table remove button is larger with a tooltip, and a hint line explains
   how to add/remove points.

Also includes a formatting pass over the two edited frontend files.

frontend/src/components/Fans/FanCurveEditor.tsx

@@ -1,10 +1,10 @@
-import { useState, useEffect, useRef, useCallback } from 'react';
+import { useState, useEffect, useRef, useCallback } from "react";
-import { Check, X, RotateCcw, Plus } from 'lucide-react';
+import { Check, X, RotateCcw, Plus } from "lucide-react";
-import { api } from '../../api/client';
+import { api } from "../../api/client";
-import { useCurveStore } from '../../store/curveStore';
+import { useCurveStore } from "../../store/curveStore";
-import type { FanPoint, FanState } from '../../types';
+import type { FanPoint, FanState } from "../../types";
-import { toast } from 'sonner';
+import { toast } from "sonner";
-import { ConfirmDialog } from '../common/ConfirmDialog';
+import { ConfirmDialog } from "../common/ConfirmDialog";
 
 function defaultCurve(): FanPoint[] {
   return [
@@ -35,7 +35,9 @@ function fanToY(f: number) {
 }
 
 function xToTemp(x: number) {
-  return Math.round(TEMP_MIN + ((x - PAD.left) / PLOT_W) * (TEMP_MAX - TEMP_MIN));
+  return Math.round(
+    TEMP_MIN + ((x - PAD.left) / PLOT_W) * (TEMP_MAX - TEMP_MIN),
+  );
 }
 
 function yToFan(y: number) {
@@ -63,13 +65,15 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
         setPending(null);
       }
     } catch {
-      toast.error('Failed to load fan state');
+      toast.error("Failed to load fan state");
     } finally {
       setLoading(false);
     }
   }
 
-  useEffect(() => { fetchFans(); }, [selectedGpuIndex]);
+  useEffect(() => {
+    fetchFans();
+  }, [selectedGpuIndex]);
 
   const activeCurve = pending ?? fanState?.curve ?? defaultCurve();
   const hasPending = pending !== null;
@@ -87,7 +91,7 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
       setConfirmApply(false);
       await fetchFans();
       onChanged?.();
-      toast.success('Fan curve applied');
+      toast.success("Fan curve applied");
     } catch (e: any) {
       setError(e.message ?? String(e));
       setConfirmApply(false);
@@ -105,7 +109,7 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
       setConfirmReset(false);
       await fetchFans();
       onChanged?.();
-      toast.success('Fan control reset to automatic');
+      toast.success("Fan control reset to automatic");
     } catch (e: any) {
       setError(e.message ?? String(e));
       setConfirmReset(false);
@@ -128,10 +132,12 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
     const fan = Math.max(FAN_MIN, Math.min(FAN_MAX, yToFan(y)));
 
     const baseCurve = pending ?? fanState?.curve ?? defaultCurve();
-    const existing = baseCurve.findIndex(p => p.temp_c === temp);
+    const existing = baseCurve.findIndex((p) => p.temp_c === temp);
     if (existing >= 0) return;
 
-    const updated = [...baseCurve, { temp_c: temp, fan_pct: fan }].sort((a, b) => a.temp_c - b.temp_c);
+    const updated = [...baseCurve, { temp_c: temp, fan_pct: fan }].sort(
+      (a, b) => a.temp_c - b.temp_c,
+    );
     setPending(updated);
   }
 
@@ -146,41 +152,47 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
     setDragIdx(idx);
   }, []);
 
-  const handlePointerMove = useCallback((e: React.PointerEvent<SVGSVGElement>) => {
+  const handlePointerMove = useCallback(
-    if (dragIdx === null) return;
+    (e: React.PointerEvent<SVGSVGElement>) => {
-    e.preventDefault();
+      if (dragIdx === null) return;
-    const svg = svgRef.current;
+      e.preventDefault();
-    if (!svg) return;
+      const svg = svgRef.current;
-    const rect = svg.getBoundingClientRect();
+      if (!svg) return;
-    const scaleX = CHART_W / rect.width;
+      const rect = svg.getBoundingClientRect();
-    const scaleY = CHART_H / rect.height;
+      const scaleX = CHART_W / rect.width;
-    const x = (e.clientX - rect.left) * scaleX;
+      const scaleY = CHART_H / rect.height;
-    const y = (e.clientY - rect.top) * scaleY;
+      const x = (e.clientX - rect.left) * scaleX;
+      const y = (e.clientY - rect.top) * scaleY;
 
-    const temp = Math.max(TEMP_MIN, Math.min(TEMP_MAX, xToTemp(x)));
+      const temp = Math.max(TEMP_MIN, Math.min(TEMP_MAX, xToTemp(x)));
-    const fan = Math.max(FAN_MIN, Math.min(FAN_MAX, yToFan(y)));
+      const fan = Math.max(FAN_MIN, Math.min(FAN_MAX, yToFan(y)));
 
-    const curve = pending ?? fanState?.curve ?? defaultCurve();
+      const curve = pending ?? fanState?.curve ?? defaultCurve();
-    const updated = [...curve];
+      const updated = [...curve];
-    updated[dragIdx] = { temp_c: temp, fan_pct: fan };
+      updated[dragIdx] = { temp_c: temp, fan_pct: fan };
-    setPending(updated);
+      setPending(updated);
-  }, [dragIdx, pending, fanState]);
+    },
+    [dragIdx, pending, fanState],
+  );
 
   const handlePointerUp = useCallback(() => {
     setDragIdx(null);
-    setPending((p) => p ? [...p].sort((a, b) => a.temp_c - b.temp_c) : p);
+    setPending((p) => (p ? [...p].sort((a, b) => a.temp_c - b.temp_c) : p));
   }, []);
 
   useEffect(() => {
     if (dragIdx === null) return;
-    window.addEventListener('pointerup', handlePointerUp);
+    window.addEventListener("pointerup", handlePointerUp);
-    return () => window.removeEventListener('pointerup', handlePointerUp);
+    return () => window.removeEventListener("pointerup", handlePointerUp);
   }, [dragIdx, handlePointerUp]);
 
   // Build polyline path from curve points
-  const curvePath = activeCurve && activeCurve.length >= 2
+  const curvePath =
-    ? activeCurve.map((p) => `${tempToX(p.temp_c)},${fanToY(p.fan_pct)}`).join(' ')
+    activeCurve && activeCurve.length >= 2
-    : null;
+      ? activeCurve
+          .map((p) => `${tempToX(p.temp_c)},${fanToY(p.fan_pct)}`)
+          .join(" ")
+      : null;
 
   // Grid lines
   const tempTicks = [30, 40, 50, 60, 70, 80, 90];
@@ -202,7 +214,9 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
       <div className="bg-zinc-900 rounded-lg overflow-hidden flex flex-col">
         {/* Header */}
         <div className="flex items-center gap-2 px-3 py-2 border-b border-zinc-800 shrink-0">
-          <span className="text-xs text-zinc-500 uppercase tracking-wider font-semibold">Fan Curve</span>
+          <span className="text-xs text-zinc-500 uppercase tracking-wider font-semibold">
+            Fan Curve
+          </span>
 
           {isDefaults && (
             <span className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full bg-orange-500/15 border border-orange-500/30 text-orange-400 text-xs">
@@ -232,7 +246,10 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
               Apply
             </button>
             <button
-              onClick={() => { setPending(null); setError(null); }}
+              onClick={() => {
+                setPending(null);
+                setError(null);
+              }}
               disabled={!hasPending || busy}
               className="flex items-center gap-1.5 px-2 py-1 rounded bg-zinc-800 hover:bg-zinc-700 text-zinc-300 text-xs transition-colors disabled:opacity-40 disabled:cursor-not-allowed"
             >
@@ -254,7 +271,12 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
         {error && (
           <div className="px-3 py-1.5 bg-red-900/40 border-b border-red-700 text-red-300 text-xs flex items-center justify-between">
             <span>{error}</span>
-            <button onClick={() => setError(null)} className="ml-2 text-red-400 hover:text-red-200">x</button>
+            <button
+              onClick={() => setError(null)}
+              className="ml-2 text-red-400 hover:text-red-200"
+            >
+              x
+            </button>
           </div>
         )}
 
@@ -263,7 +285,8 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
           {isDefaults && (
             <div className="absolute inset-x-4 top-4 z-10 pointer-events-none text-center">
               <span className="inline-block bg-zinc-900/90 backdrop-blur-sm border border-orange-500/30 rounded-lg px-4 py-2 text-xs text-orange-400/90 font-medium">
-                Default curve — edit points or apply as-is to enable curve control
+                Default curve — edit points or apply as-is to enable curve
+                control
               </span>
             </div>
           )}
@@ -272,51 +295,95 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
             width="100%"
             viewBox={`0 0 ${CHART_W} ${CHART_H}`}
             className="max-w-full cursor-crosshair select-none"
-            style={{ touchAction: 'none' }}
+            style={{ touchAction: "none" }}
             onClick={handleCanvasClick}
             onPointerMove={handlePointerMove}
           >
             {/* Background */}
-            <rect x={PAD.left} y={PAD.top} width={PLOT_W} height={PLOT_H} fill="#09090b" rx="4" />
+            <rect
+              x={PAD.left}
+              y={PAD.top}
+              width={PLOT_W}
+              height={PLOT_H}
+              fill="#09090b"
+              rx="4"
+            />
 
             {/* Grid lines - horizontal (fan %) */}
-            {fanTicks.map(f => (
+            {fanTicks.map((f) => (
               <g key={`fy-${f}`}>
                 <line
-                  x1={PAD.left} y1={fanToY(f)}
+                  x1={PAD.left}
-                  x2={PAD.left + PLOT_W} y2={fanToY(f)}
+                  y1={fanToY(f)}
-                  stroke="#27272a" strokeWidth="0.5"
+                  x2={PAD.left + PLOT_W}
+                  y2={fanToY(f)}
+                  stroke="#27272a"
+                  strokeWidth="0.5"
                 />
-                <text x={PAD.left - 6} y={fanToY(f) + 3} textAnchor="end" fill="#71717a" fontSize="9" fontFamily="monospace">
+                <text
+                  x={PAD.left - 6}
+                  y={fanToY(f) + 3}
+                  textAnchor="end"
+                  fill="#71717a"
+                  fontSize="9"
+                  fontFamily="monospace"
+                >
                   {f}%
                 </text>
               </g>
             ))}
 
             {/* Grid lines - vertical (temp) */}
-            {tempTicks.map(t => (
+            {tempTicks.map((t) => (
               <g key={`tx-${t}`}>
                 <line
-                  x1={tempToX(t)} y1={PAD.top}
+                  x1={tempToX(t)}
-                  x2={tempToX(t)} y2={PAD.top + PLOT_H}
+                  y1={PAD.top}
-                  stroke="#27272a" strokeWidth="0.5"
+                  x2={tempToX(t)}
+                  y2={PAD.top + PLOT_H}
+                  stroke="#27272a"
+                  strokeWidth="0.5"
                 />
-                <text x={tempToX(t)} y={PAD.top + PLOT_H + 16} textAnchor="middle" fill="#71717a" fontSize="9" fontFamily="monospace">
+                <text
+                  x={tempToX(t)}
+                  y={PAD.top + PLOT_H + 16}
+                  textAnchor="middle"
+                  fill="#71717a"
+                  fontSize="9"
+                  fontFamily="monospace"
+                >
                   {t}°
                 </text>
               </g>
             ))}
 
             {/* Axis labels */}
-            <text x={PAD.left + PLOT_W / 2} y={CHART_H - 2} textAnchor="middle" fill="#52525b" fontSize="9">Temperature (°C)</text>
+            <text
-            <text x={8} y={PAD.top + PLOT_H / 2} textAnchor="middle" fill="#52525b" fontSize="9" transform={`rotate(-90, 8, ${PAD.top + PLOT_H / 2})`}>Fan Speed (%)</text>
+              x={PAD.left + PLOT_W / 2}
+              y={CHART_H - 2}
+              textAnchor="middle"
+              fill="#52525b"
+              fontSize="9"
+            >
+              Temperature (°C)
+            </text>
+            <text
+              x={8}
+              y={PAD.top + PLOT_H / 2}
+              textAnchor="middle"
+              fill="#52525b"
+              fontSize="9"
+              transform={`rotate(-90, 8, ${PAD.top + PLOT_H / 2})`}
+            >
+              Fan Speed (%)
+            </text>
 
             {/* Curve line */}
             {curvePath && (
               <polyline
                 points={curvePath}
                 fill="none"
-                stroke={hasPending ? '#22d3ee' : '#fb923c'}
+                stroke={hasPending ? "#22d3ee" : "#fb923c"}
                 strokeWidth="2"
                 strokeLinejoin="round"
                 strokeLinecap="round"
@@ -328,7 +395,7 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
             {curvePath && activeCurve && activeCurve.length >= 2 && (
               <polygon
                 points={`${tempToX(activeCurve[0].temp_c)},${PAD.top + PLOT_H} ${curvePath} ${tempToX(activeCurve[activeCurve.length - 1].temp_c)},${PAD.top + PLOT_H}`}
-                fill={hasPending ? '#22d3ee' : '#fb923c'}
+                fill={hasPending ? "#22d3ee" : "#fb923c"}
                 opacity="0.07"
               />
             )}
@@ -340,40 +407,62 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
                   cx={tempToX(p.temp_c)}
                   cy={fanToY(p.fan_pct)}
                   r="6"
-                  fill={hasPending ? '#22d3ee' : '#fb923c'}
+                  fill={hasPending ? "#22d3ee" : "#fb923c"}
                   stroke="#09090b"
                   strokeWidth="2"
                   className="cursor-grab active:cursor-grabbing"
-                  style={{ touchAction: 'none' }}
+                  style={{ touchAction: "none" }}
                   onPointerDown={(e) => {
                     e.stopPropagation();
                     handlePointerDown(i);
                   }}
                 />
-                {/* Delete button on hover */}
+                {/* Remove button: faintly visible, brightens on hover */}
                 {activeCurve && activeCurve.length > 2 && (
-                  <circle
+                  <g
-                    cx={tempToX(p.temp_c) + 8}
+                    className="cursor-pointer group/remove"
-                    cy={fanToY(p.fan_pct) - 8}
-                    r="7"
-                    fill="#27272a"
-                    stroke="#3f3f46"
-                    strokeWidth="1"
-                    className="cursor-pointer opacity-0 hover:opacity-100 transition-opacity"
                     onClick={(e) => {
                       e.stopPropagation();
                       removePoint(i);
                     }}
                   >
                     <title>Remove point</title>
-                  </circle>
+                    <circle
+                      cx={tempToX(p.temp_c) + 9}
+                      cy={fanToY(p.fan_pct) - 9}
+                      r="7"
+                      fill="#27272a"
+                      stroke="#3f3f46"
+                      strokeWidth="1"
+                      className="opacity-50 group-hover/remove:opacity-100 group-hover/remove:stroke-red-400 transition-opacity"
+                    />
+                    {/* X glyph */}
+                    <line
+                      x1={tempToX(p.temp_c) + 6.5}
+                      y1={fanToY(p.fan_pct) - 11.5}
+                      x2={tempToX(p.temp_c) + 11.5}
+                      y2={fanToY(p.fan_pct) - 6.5}
+                      stroke="#a1a1aa"
+                      strokeWidth="1.2"
+                      className="group-hover/remove:stroke-red-400 transition-colors"
+                    />
+                    <line
+                      x1={tempToX(p.temp_c) + 11.5}
+                      y1={fanToY(p.fan_pct) - 11.5}
+                      x2={tempToX(p.temp_c) + 6.5}
+                      y2={fanToY(p.fan_pct) - 6.5}
+                      stroke="#a1a1aa"
+                      strokeWidth="1.2"
+                      className="group-hover/remove:stroke-red-400 transition-colors"
+                    />
+                  </g>
                 )}
                 {/* Value label */}
                 <text
                   x={tempToX(p.temp_c)}
                   y={fanToY(p.fan_pct) - 12}
                   textAnchor="middle"
-                  fill={hasPending ? '#22d3ee' : '#fb923c'}
+                  fill={hasPending ? "#22d3ee" : "#fb923c"}
                   fontSize="8"
                   fontFamily="monospace"
                   fontWeight="600"
@@ -386,7 +475,13 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
 
             {/* No-curve hint (only when curve is truly empty) */}
             {!activeCurve && (
-              <text x={CHART_W / 2} y={CHART_H / 2} textAnchor="middle" fill="#52525b" fontSize="11">
+              <text
+                x={CHART_W / 2}
+                y={CHART_H / 2}
+                textAnchor="middle"
+                fill="#52525b"
+                fontSize="11"
+              >
                 Click to add points
               </text>
             )}
@@ -397,7 +492,9 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
         {activeCurve && activeCurve.length > 0 && (
           <div className="px-4 pb-3">
             <div className="flex items-center justify-between mb-2">
-              <span className="text-xs text-zinc-500 uppercase tracking-wider">Curve Points</span>
+              <span className="text-xs text-zinc-500 uppercase tracking-wider">
+                Curve Points
+              </span>
               <button
                 onClick={() => {
                   const curve = pending ?? fanState?.curve ?? defaultCurve();
@@ -423,16 +520,29 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
                 <tbody>
                   {activeCurve.map((p, i) => (
                     <tr key={i} className="border-t border-zinc-800/50">
-                      <td className="py-1 font-mono text-zinc-300">{p.temp_c}</td>
+                      <td className="py-1 font-mono text-zinc-300">
-                      <td className="py-1 font-mono text-zinc-300">{p.fan_pct}</td>
+                        {p.temp_c}
-                      <td className="py-1">
+                      </td>
-                        {activeCurve.length > 2 && (
+                      <td className="py-1 font-mono text-zinc-300">
+                        {p.fan_pct}
+                      </td>
+                      <td className="py-1 text-right">
+                        {activeCurve.length > 2 ? (
                           <button
                             onClick={() => removePoint(i)}
-                            className="text-zinc-600 hover:text-red-400 transition-colors"
+                            title="Remove point"
+                            aria-label="Remove point"
+                            className="p-1 text-zinc-600 hover:text-red-400 hover:bg-red-900/30 rounded transition-colors"
                           >
-                            <X size={10} />
+                            <X size={12} />
                           </button>
+                        ) : (
+                          <span
+                            className="text-zinc-700"
+                            title="A curve needs at least 2 points"
+                          >
+                            —
+                          </span>
                         )}
                       </td>
                     </tr>
@@ -446,10 +556,14 @@ export function FanCurveEditor({ onChanged }: { onChanged?: () => void }) {
         {/* Info */}
         <div className="px-4 pb-3 text-[10px] text-zinc-600">
           {curveActive
-            ? 'Fan curve is active. Server adjusts fan speed based on GPU temperature.'
+            ? "Fan curve is active. Server adjusts fan speed based on GPU temperature."
             : isDefaults
-              ? 'These are default values. Click Apply to enable curve control, or edit points first.'
+              ? "These are default values. Click Apply to enable curve control, or edit points first."
-              : 'Apply a curve to enable automatic fan control based on temperature.'}
+              : "Apply a curve to enable automatic fan control based on temperature."}
+          <span className="block mt-1 text-zinc-700">
+            Drag points to adjust · click the chart to add a point · click the ✕
+            (chart or table) to remove one.
+          </span>
         </div>
       </div>
 

frontend/src/components/Profiles/ProfilePanel.tsx

@@ -1,16 +1,27 @@
-import { useState, useEffect, useRef } from 'react';
+import { useState, useEffect, useRef } from "react";
-import { Save, Trash2, Check, ChevronRight, Pencil, Star } from 'lucide-react';
+import {
-import { api } from '../../api/client';
+  Save,
-import type { ProfileData } from '../../types';
+  Trash2,
-import { toast } from 'sonner';
+  Check,
-import { useCurveStore } from '../../store/curveStore';
+  ChevronRight,
+  Pencil,
+  Star,
+  Fan,
+} from "lucide-react";
+import { api } from "../../api/client";
+import type { ProfileData } from "../../types";
+import { toast } from "sonner";
+import { useCurveStore } from "../../store/curveStore";
 
 interface ProfilePanelProps {
   activeProfile: string | null;
   onProfileApplied: (name: string | null) => void;
 }
 
-export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelProps) {
+export function ProfilePanel({
+  activeProfile,
+  onProfileApplied,
+}: ProfilePanelProps) {
   const { selectedGpuIndex, gpuInfo } = useCurveStore();
   const [profiles, setProfiles] = useState<ProfileData[]>([]);
   const [loading, setLoading] = useState(true);
@@ -18,7 +29,7 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
 
   // Save form
   const [isSaveOpen, setIsSaveOpen] = useState(false);
-  const [newName, setNewName] = useState('');
+  const [newName, setNewName] = useState("");
   const [isSaving, setIsSaving] = useState(false);
   const saveInputRef = useRef<HTMLInputElement>(null);
 
@@ -28,7 +39,7 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
 
   // Inline rename
   const [renamingName, setRenamingName] = useState<string | null>(null);
-  const [renameValue, setRenameValue] = useState('');
+  const [renameValue, setRenameValue] = useState("");
   const [isRenaming, setIsRenaming] = useState(false);
   const renameInputRef = useRef<HTMLInputElement>(null);
 
@@ -42,7 +53,7 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
       onProfileApplied(data.active);
       setAutoLoadProfile(data.auto_load);
     } catch {
-      toast.error('Failed to load profiles');
+      toast.error("Failed to load profiles");
     } finally {
       setLoading(false);
     }
@@ -53,17 +64,21 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
       await api.setAutoLoadProfile(name, selectedGpuIndex);
       setAutoLoadProfile(name);
       if (name) toast.success(`"${name}" will load on server start`);
-      else toast.success('Auto-load cleared');
+      else toast.success("Auto-load cleared");
     } catch (e: any) {
-      toast.error('Failed to update default profile: ' + (e.message || String(e)));
+      toast.error(
+        "Failed to update default profile: " + (e.message || String(e)),
+      );
     }
   }
 
-  useEffect(() => { fetchProfiles(); }, [selectedGpuIndex]);
+  useEffect(() => {
+    fetchProfiles();
+  }, [selectedGpuIndex]);
 
   useEffect(() => {
     if (isSaveOpen) saveInputRef.current?.focus();
-    else setNewName('');
+    else setNewName("");
   }, [isSaveOpen]);
 
   useEffect(() => {
@@ -80,7 +95,7 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
       setIsSaveOpen(false);
       await fetchProfiles();
     } catch (e: any) {
-      toast.error('Failed to save: ' + (e.message || String(e)));
+      toast.error("Failed to save: " + (e.message || String(e)));
     } finally {
       setIsSaving(false);
     }
@@ -109,7 +124,7 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
       setDeletingName(null);
       await fetchProfiles();
     } catch (e: any) {
-      toast.error('Failed to delete: ' + (e.message || String(e)));
+      toast.error("Failed to delete: " + (e.message || String(e)));
     } finally {
       setIsDeleting(false);
     }
@@ -130,7 +145,7 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
       setRenamingName(null);
       await fetchProfiles();
     } catch (e: any) {
-      toast.error('Failed to rename: ' + (e.message || String(e)));
+      toast.error("Failed to rename: " + (e.message || String(e)));
     } finally {
       setIsRenaming(false);
     }
@@ -162,9 +177,9 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
               type="text"
               placeholder="Profile name..."
               value={newName}
-              onChange={e => setNewName(e.target.value)}
+              onChange={(e) => setNewName(e.target.value)}
               disabled={isSaving}
-              onKeyDown={e => e.key === 'Escape' && setIsSaveOpen(false)}
+              onKeyDown={(e) => e.key === "Escape" && setIsSaveOpen(false)}
               className="flex-1 min-w-0 bg-zinc-950 border border-zinc-700 rounded px-3 py-1.5 text-sm focus:outline-none focus:border-pink-500 focus:ring-1 focus:ring-pink-500 disabled:opacity-50"
             />
             <button
@@ -201,13 +216,17 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
           </p>
         ) : (
           <div className="flex flex-col gap-0.5 px-2">
-            {profiles.map(p => {
+            {profiles.map((p) => {
               const pts = Object.keys(p.curve_deltas).length;
               const badges = [
                 pts > 0 ? `${pts} pts` : null,
                 p.power_limit_w != null ? `${p.power_limit_w}W` : null,
-                p.mem_offset_mhz != null ? `${p.mem_offset_mhz > 0 ? '+' : ''}${p.mem_offset_mhz} MHz mem` : null,
+                p.mem_offset_mhz != null
-              ].filter(Boolean).join(' · ');
+                  ? `${p.mem_offset_mhz > 0 ? "+" : ""}${p.mem_offset_mhz} MHz mem`
+                  : null,
+              ]
+                .filter(Boolean)
+                .join(" · ");
 
               const isActive = activeProfile === p.name;
               const isAutoLoad = autoLoadProfile === p.name;
@@ -218,11 +237,13 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
               return (
                 <div
                   key={p.name}
-                  className={`group rounded-md transition ${isActive ? 'bg-zinc-800/60' : 'hover:bg-zinc-800/50'}`}
+                  className={`group rounded-md transition ${isActive ? "bg-zinc-800/60" : "hover:bg-zinc-800/50"}`}
                 >
                   {isConfirmingDelete ? (
                     <div className="flex items-center justify-between px-3 py-2 gap-2">
-                      <span className="text-sm text-zinc-300 truncate min-w-0">Delete "{p.name}"?</span>
+                      <span className="text-sm text-zinc-300 truncate min-w-0">
+                        Delete "{p.name}"?
+                      </span>
                       <div className="flex gap-1.5 shrink-0">
                         <button
                           onClick={() => handleDeleteConfirm(p.name)}
@@ -240,14 +261,19 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
                       </div>
                     </div>
                   ) : isRenaming_ ? (
-                    <form onSubmit={e => handleRename(e, p.name)} className="flex items-center gap-2 px-3 py-2">
+                    <form
+                      onSubmit={(e) => handleRename(e, p.name)}
+                      className="flex items-center gap-2 px-3 py-2"
+                    >
                       <input
                         ref={renameInputRef}
                         type="text"
                         value={renameValue}
-                        onChange={e => setRenameValue(e.target.value)}
+                        onChange={(e) => setRenameValue(e.target.value)}
                         disabled={isRenaming}
-                        onKeyDown={e => e.key === 'Escape' && setRenamingName(null)}
+                        onKeyDown={(e) =>
+                          e.key === "Escape" && setRenamingName(null)
+                        }
                         className="flex-1 min-w-0 bg-zinc-950 border border-zinc-600 rounded px-2 py-1 text-sm focus:outline-none focus:border-pink-500 focus:ring-1 focus:ring-pink-500 disabled:opacity-50"
                       />
                       <button
@@ -268,25 +294,48 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
                   ) : (
                     <div className="flex items-center justify-between px-3 py-2">
                       <div className="flex items-center gap-2 min-w-0 pr-2">
-                        {isActive
+                        {isActive ? (
-                          ? <Check size={13} className="text-emerald-400 shrink-0" />
+                          <Check
-                          : <span className="w-[13px] shrink-0" />
+                            size={13}
-                        }
+                            className="text-emerald-400 shrink-0"
+                          />
+                        ) : (
+                          <span className="w-[13px] shrink-0" />
+                        )}
                         <div className="min-w-0">
                           <div className="flex items-center gap-1.5">
-                            <p className={`text-sm font-medium truncate ${isActive ? 'text-zinc-100' : 'text-zinc-300'}`}>
+                            <p
+                              className={`text-sm font-medium truncate ${isActive ? "text-zinc-100" : "text-zinc-300"}`}
+                            >
                               {p.name}
                             </p>
                             {isAutoLoad && (
-                              <Star size={11} className="text-sky-400 shrink-0" fill="currentColor" />
+                              <Star
+                                size={11}
+                                className="text-sky-400 shrink-0"
+                                fill="currentColor"
+                              />
+                            )}
+                            {p.fan_curve && p.fan_curve.length > 0 && (
+                              <span
+                                className="shrink-0 text-cyan-400"
+                                title="Custom fan curve saved"
+                              >
+                                <Fan size={11} />
+                              </span>
                             )}
                             {gpuInfo && p.gpu_name !== gpuInfo.name && (
-                              <span className="text-xs text-zinc-600 truncate shrink-0" title={`Saved from ${p.gpu_name}`}>
+                              <span
+                                className="text-xs text-zinc-600 truncate shrink-0"
+                                title={`Saved from ${p.gpu_name}`}
+                              >
                                 {p.gpu_name}
                               </span>
                             )}
                           </div>
-                          {badges && <p className="text-xs text-zinc-500">{badges}</p>}
+                          {badges && (
+                            <p className="text-xs text-zinc-500">{badges}</p>
+                          )}
                         </div>
                       </div>
 
@@ -296,21 +345,34 @@ export function ProfilePanel({ activeProfile, onProfileApplied }: ProfilePanelPr
                           disabled={isApplying}
                           className="flex items-center gap-1 px-2 py-1 text-xs rounded text-zinc-400 hover:text-emerald-400 hover:bg-zinc-700 transition disabled:opacity-50 font-medium"
                         >
-                          {isApplying
+                          {isApplying ? (
-                            ? <span className="w-3 h-3 border border-zinc-500 border-t-emerald-400 rounded-full animate-spin" />
+                            <span className="w-3 h-3 border border-zinc-500 border-t-emerald-400 rounded-full animate-spin" />
-                            : <ChevronRight size={13} />
+                          ) : (
-                          }
+                            <ChevronRight size={13} />
+                          )}
                           Apply
                         </button>
                         <button
-                          onClick={() => handleSetAutoLoad(isAutoLoad ? null : p.name)}
+                          onClick={() =>
-                          className={`p-1.5 rounded transition hover:bg-zinc-700 ${isAutoLoad ? 'text-sky-400 hover:text-sky-300' : 'text-zinc-600 hover:text-sky-400'}`}
+                            handleSetAutoLoad(isAutoLoad ? null : p.name)
-                          title={isAutoLoad ? 'Clear default profile' : 'Set as default profile'}
+                          }
+                          className={`p-1.5 rounded transition hover:bg-zinc-700 ${isAutoLoad ? "text-sky-400 hover:text-sky-300" : "text-zinc-600 hover:text-sky-400"}`}
+                          title={
+                            isAutoLoad
+                              ? "Clear default profile"
+                              : "Set as default profile"
+                          }
                         >
-                          <Star size={13} fill={isAutoLoad ? 'currentColor' : 'none'} />
+                          <Star
+                            size={13}
+                            fill={isAutoLoad ? "currentColor" : "none"}
+                          />
                         </button>
                         <button
-                          onClick={() => { setRenamingName(p.name); setRenameValue(p.name); }}
+                          onClick={() => {
+                            setRenamingName(p.name);
+                            setRenameValue(p.name);
+                          }}
                           className="p-1.5 text-zinc-600 hover:text-zinc-300 hover:bg-zinc-700 rounded transition"
                           title="Rename"
                         >

nvcurve/cli.py

@@ -2092,6 +2092,9 @@ def main():
             elif "auto_load_profile" in data:
                 # Migrate old single-string format — GPU 0, no UUID known at this point
                 cfg.auto_load_profiles = {"idx:0": data["auto_load_profile"]}
+            if "fan_curves" in data:
+                # Per-GPU active fan curves, restored on server startup.
+                cfg.fan_curves = dict(data["fan_curves"])
     except Exception:
         pass
 

nvcurve/config.py

@@ -30,6 +30,13 @@ class Config:
     # Value = profile name (str).
     auto_load_profiles: dict[str, str] = field(default_factory=dict)
 
+    # Per-GPU active fan curves: restored automatically on server startup so a
+    # curve applied via the UI survives server restarts (fan control itself is
+    # volatile — the driver reverts to automatic mode on reboot).
+    # Key = stable GPU identifier (same as auto_load_profiles).
+    # Value = list of {"temp_c": int, "fan_pct": int} sorted by temp_c.
+    fan_curves: dict[str, list] = field(default_factory=dict)
+
 
 # Module-level default config instance.
 default_config = Config()

nvcurve/server.py

@@ -237,6 +237,58 @@ async def _fan_poller(gpu_index: int) -> None:
         await asyncio.sleep(2.0)
 
 
+async def _activate_fan_curve(gpu_index: int, curve: list) -> None:
+    """Set the active fan curve, (re)start the poller, and persist it.
+
+    Persistence (config.json) is what makes the curve survive server restarts:
+    fan control is volatile, so the driver reverts to automatic mode on reboot
+    and the saved curve is re-applied at the next server start.
+    """
+    g_state = _get_gpu_state(gpu_index)
+
+    # Stop existing poller if running
+    if g_state.get("fan_poller_task"):
+        g_state["fan_poller_task"].cancel()
+        with suppress(asyncio.CancelledError):
+            await g_state["fan_poller_task"]
+
+    g_state["fan_curve"] = curve
+    g_state["fan_curve_active"] = True
+    g_state["fan_poller_task"] = asyncio.create_task(_fan_poller(gpu_index))
+
+    cfg: Config = _state["config"]
+    cfg.fan_curves[_gpu_stable_key(gpu_index)] = curve
+    _persist_fan_curves(cfg.fan_curves)
+
+
+async def _deactivate_fan_curve(gpu_index: int, reset_hardware: bool = True) -> None:
+    """Clear the active fan curve, stop the poller, and clear its persistence.
+
+    When reset_hardware is True the GPU is returned to automatic fan control.
+    """
+    g_state = _get_gpu_state(gpu_index)
+
+    if g_state.get("fan_poller_task"):
+        g_state["fan_poller_task"].cancel()
+        with suppress(asyncio.CancelledError):
+            await g_state["fan_poller_task"]
+        g_state["fan_poller_task"] = None
+
+    g_state["fan_curve"] = None
+    g_state["fan_curve_active"] = False
+
+    if reset_hardware:
+        ok, msg = await _run(reset_fan, gpu_index)
+        if not ok:
+            log.warning("Fan reset warning: %s", msg)
+
+    cfg: Config = _state["config"]
+    key = _gpu_stable_key(gpu_index)
+    if key in cfg.fan_curves:
+        del cfg.fan_curves[key]
+        _persist_fan_curves(cfg.fan_curves)
+
+
 # ── Lifespan ──────────────────────────────────────────────────────────────────
 
 
@@ -326,6 +378,35 @@ async def lifespan(app: FastAPI):
                 )
     # ──────────────────────────────────────────────────────────────────────────
 
+    # ── Restore persisted fan curves ──────────────────────────────────────────
+    # Fan control is volatile: the driver reverts to automatic mode on reboot,
+    # so a curve applied via the UI is persisted in config.json and re-applied
+    # here at startup. Runs after the auto-load profile path so the user's
+    # explicit fan curve setting takes precedence.
+    for gpu_index, g_state in _state["gpus"].items():
+        if g_state["gpu"] is None:
+            continue
+        if g_state.get("fan_curve_active"):
+            continue  # already activated by the auto-load profile path
+        key = _gpu_stable_key(gpu_index)
+        curve = cfg.fan_curves.get(key)
+        if not curve:
+            continue
+        ok, msg = validate_curve(curve)
+        if not ok:
+            log.warning("Skipping persisted fan curve for GPU %d: %s", gpu_index, msg)
+            continue
+        log.info("Restoring persisted fan curve on GPU %d (%s)", gpu_index, key)
+        try:
+            await _activate_fan_curve(gpu_index, curve)
+        except Exception as exc:
+            log.warning(
+                "Failed to restore persisted fan curve on GPU %d: %s",
+                gpu_index,
+                exc,
+            )
+    # ──────────────────────────────────────────────────────────────────────────
+
     yield  # server is running
 
     for task in poller_tasks:
@@ -745,6 +826,11 @@ def _persist_auto_load_profiles(profiles: dict[str, str]) -> None:
     _persist_config_field("auto_load_profiles", profiles if profiles else None)
 
 
+def _persist_fan_curves(fan_curves: dict) -> None:
+    """Persist the per-GPU active fan curves dict to config.json."""
+    _persist_config_field("fan_curves", fan_curves if fan_curves else None)
+
+
 @app.get("/api/profiles")
 async def api_profiles(gpu_index: int = 0):
     """List saved native profiles, the active profile name, and the auto-load profile name."""
@@ -931,31 +1017,16 @@ async def _apply_profile(name: str, gpu_index: int = 0) -> list[str]:
 
         await _update_offsets_and_broadcast(gpu_index)
 
-    # Apply fan curve if present in profile
+    # Apply fan curve if present in profile (persists it so it survives restarts);
+    # otherwise deactivate any active fan curve (and clear its persistence).
     if profile.fan_curve:
         ok, msg = validate_curve(profile.fan_curve)
         if not ok:
             errs.append(f"Fan curve: {msg}")
         else:
-            # Stop existing fan poller if running
+            await _activate_fan_curve(gpu_index, profile.fan_curve)
-            if g_state.get("fan_poller_task"):
-                g_state["fan_poller_task"].cancel()
-                with suppress(asyncio.CancelledError):
-                    await g_state["fan_poller_task"]
-
-            g_state["fan_curve"] = profile.fan_curve
-            g_state["fan_curve_active"] = True
-            g_state["fan_poller_task"] = asyncio.create_task(_fan_poller(gpu_index))
     elif g_state.get("fan_curve_active"):
-        # Profile has no fan curve, deactivate any active fan curve
+        await _deactivate_fan_curve(gpu_index, reset_hardware=True)
-        if g_state.get("fan_poller_task"):
-            g_state["fan_poller_task"].cancel()
-            with suppress(asyncio.CancelledError):
-                await g_state["fan_poller_task"]
-            g_state["fan_poller_task"] = None
-        g_state["fan_curve"] = None
-        g_state["fan_curve_active"] = False
-        await _run(reset_fan, gpu_index)
 
     if not errs:
         g_state["active_profile"] = name
@@ -1196,15 +1267,8 @@ async def api_fans_update(req: FanCurveRequest, gpu_index: int = 0):
                     status_code=500, detail=f"Fan control not available: {fan_msg}"
                 )
 
-    # Stop existing poller if running
+    # Activate the curve (starts the poller) and persist it so it survives restarts.
-    if g_state.get("fan_poller_task"):
+    await _activate_fan_curve(gpu_index, curve_data)
-        g_state["fan_poller_task"].cancel()
-        with suppress(asyncio.CancelledError):
-            await g_state["fan_poller_task"]
-
-    g_state["fan_curve"] = curve_data
-    g_state["fan_curve_active"] = True
-    g_state["fan_poller_task"] = asyncio.create_task(_fan_poller(gpu_index))
 
     return {"ok": True}
 
@@ -1212,21 +1276,11 @@ async def api_fans_update(req: FanCurveRequest, gpu_index: int = 0):
 @app.post("/api/fans/reset")
 async def api_fans_reset(gpu_index: int = 0):
     """Deactivate fan curve control and restore automatic fan mode."""
-    g_state = _get_gpu_state(gpu_index)
+    _get_gpu_state(gpu_index)
 
-    # Stop poller
+    # Stop the poller, clear state, restore automatic fan control, and clear
-    if g_state.get("fan_poller_task"):
+    # the persisted curve so it is not re-applied on the next server start.
-        g_state["fan_poller_task"].cancel()
+    await _deactivate_fan_curve(gpu_index, reset_hardware=True)
-        with suppress(asyncio.CancelledError):
-            await g_state["fan_poller_task"]
-        g_state["fan_poller_task"] = None
-
-    g_state["fan_curve"] = None
-    g_state["fan_curve_active"] = False
-
-    ok, msg = await _run(reset_fan, gpu_index)
-    if not ok:
-        log.warning("Fan reset warning: %s", msg)
 
     return {"ok": True}