fix: start web stats capture from boot on >=4MB PSRAM boards

docs/web-panel.md

@@ -28,12 +28,12 @@ Operational guidance:
 
 The screenshots below show the current split between the lighter `/app` admin page and the dedicated `/stats` status page.
 
-### `/app`
+### `/app` screenshot
 
 ![Repeater web panel `/app` overview](./_assets/repeater_web_panel_app_light.png#only-light)
 ![Repeater web panel `/app` overview](./_assets/repeater_web_panel_app_dark.png#only-dark)
 
-### `/stats`
+### `/stats` screenshot
 
 ![Repeater web panel `/stats` overview](./_assets/repeater_web_panel_stats_light.png#only-light)
 ![Repeater web panel `/stats` overview](./_assets/repeater_web_panel_stats_dark.png#only-dark)
@@ -210,12 +210,14 @@ Stats samples are collected once per minute.
 
 Current in-memory history caps are:
 
-| Board class                    | Sample cap | Event cap | Approx. sampled history  |
-| ------------------------------ | ---------: | --------: | ------------------------ |
-| No PSRAM                       |       `24` |       `8` | Live-only recent history |
-| Less than `4MB` PSRAM          |      `240` |      `96` | About `4` hours          |
-| `4MB` to less than `8MB` PSRAM |      `480` |     `192` | About `8` hours          |
-| `8MB` PSRAM or more            |      `720` |     `288` | About `12` hours         |
+| Board class                      | Sample cap | Event cap | Approx. sampled history  |
+| -------------------------------- | ---------: | --------: | ------------------------ |
+| No PSRAM                         |       `24` |       `8` | Live-only recent history |
+| Less than `4 MB` PSRAM           |      `240` |      `96` | About `4` hours          |
+| `4 MB` to less than `8 MB` PSRAM |      `480` |     `192` | About `8` hours          |
+| `8 MB` PSRAM or more             |      `720` |     `288` | About `12` hours         |
+
+On boards with `4 MB` PSRAM or more, stats history starts capturing from boot when `web.stats` is enabled, even if `/stats` has not been opened yet.
 
 Archive-backed restore requires `web.stats` enabled plus a mounted SD card on boards that support the EastMesh archive path.
 

src/helpers/StatsHistory.cpp

@@ -64,6 +64,14 @@ bool shouldUseLiveOnlyStats() {
 #endif
 }
 
+bool hasBootAutoCapturePsram() {
+#if defined(ESP32)
+  return psramFound() && ESP.getPsramSize() >= (4UL * 1024UL * 1024UL);
+#else
+  return false;
+#endif
+}
+
 template <typename T>
 T* allocHistoryBuffer(size_t count) {
 #if defined(ESP32)
@@ -291,6 +299,9 @@ void StatsHistory::begin(bool enabled, ArchiveStorage* archive) {
   _enabled = enabled;
   _next_summary_flush_ms = millis() + kSummaryFlushIntervalMs;
   _next_event_flush_ms = millis() + kEventFlushIntervalMs;
+  if (_enabled && shouldAutoActivateFromBoot()) {
+    activate();
+  }
 }
 
 void StatsHistory::setArchive(ArchiveStorage* archive) {
@@ -315,6 +326,9 @@ void StatsHistory::setEnabled(bool enabled) {
     _last_access_ms = 0;
     _next_summary_flush_ms = millis() + kSummaryFlushIntervalMs;
     _next_event_flush_ms = millis() + kEventFlushIntervalMs;
+    if (shouldAutoActivateFromBoot()) {
+      activate();
+    }
   }
 }
 
@@ -397,6 +411,10 @@ bool StatsHistory::supportsPersistence() const {
   return !_live_only;
 }
 
+bool StatsHistory::shouldAutoActivateFromBoot() const {
+  return _enabled && !_live_only && hasBootAutoCapturePsram();
+}
+
 bool StatsHistory::isAccessActive(uint32_t now_ms) const {
   if (!_live_only) {
     return true;

src/helpers/StatsHistory.h

@@ -106,6 +106,7 @@ private:
   bool ensureBuffers();
   void releaseBuffers();
   bool supportsPersistence() const;
+  bool shouldAutoActivateFromBoot() const;
   bool isAccessActive(uint32_t now_ms) const;
   bool restoreSummaryLog();
   bool restoreEventsLog();

src/helpers/web/WebPanelServer.cpp

@@ -1684,7 +1684,7 @@ const char kWebPanelAppHtml[] PROGMEM = R"HTML(
     function sparkStrokeColor(key, points) {
       if (key === "packets") return "#d97706";
       if (key === "signal") return "#3b82f6";
-      if (key === "noise_floor") return "#ef4444";
+      if (key === "noise_floor") return "#94a3b8";
       if (key === "memory") {
         const values = Array.isArray(points) ? points.map((item) => item && item[1]).filter((value) => Number.isFinite(value)) : [];
         const current = values.length ? values[values.length - 1] : NaN;