diff --git a/app/Services/ZaarboxPriceService.php b/app/Services/ZaarboxPriceService.php
index 2e04f01..3de03e3 100644
--- a/app/Services/ZaarboxPriceService.php
+++ b/app/Services/ZaarboxPriceService.php
@@ -50,15 +50,31 @@ class ZaarboxPriceService
         ));
     }
 
-    /** UUID سری زمانی نمودار در API تاریخچه Zaarbox */
+    /**
+     * UUID سری نمودار: settings.chart_id؛ وگرنه پیش‌فرض گلد علی.
+     * GET https://price.zaarbox.ir/api/history/{id}
+     */
     public function historyId(): string
     {
-        $id = trim((string) $this->config->getString(
-            'zaarbox_gold_history_id',
-            (string) config('price_providers.zaarbox_gold_history_id', self::DEFAULT_HISTORY_ID)
-        ));
+        $chartId = $this->config->getString('chart_id', '');
+        if ($chartId !== '') {
+            return $chartId;
+        }
 
-        return $id !== '' ? $id : self::DEFAULT_HISTORY_ID;
+        $legacy = $this->config->getString(
+            'zaarbox_gold_history_id',
+            (string) config('price_providers.zaarbox_gold_history_id', '')
+        );
+        if ($legacy !== '') {
+            return $legacy;
+        }
+
+        return self::DEFAULT_HISTORY_ID;
+    }
+
+    private function cacheKey(): string
+    {
+        return self::CACHE_KEY . ':' . $this->historyId();
     }
 
     /**
@@ -66,7 +82,7 @@ class ZaarboxPriceService
      */
     public function getAllPrices(): array
     {
-        $cached = Cache::get(self::CACHE_KEY);
+        $cached = Cache::get($this->cacheKey());
 
         if (is_array($cached) && isset($cached['prices'])) {
             return $cached['prices'];
@@ -82,7 +98,7 @@ class ZaarboxPriceService
     {
         $prices = $this->fetchChartPrices();
 
-        Cache::put(self::CACHE_KEY, [
+        Cache::put($this->cacheKey(), [
             'prices' => $prices,
             'refreshed_at' => now()->toIso8601String(),
         ], now()->addMinutes(self::CACHE_TTL_MINUTES));
@@ -244,7 +260,7 @@ class ZaarboxPriceService
 
             $result[] = [
                 'value' => intdiv($lastPoint['price'], 1000),
-                'timestamp' => $lastPoint['timestamp'],
+                'timestamp' => $bucket,
             ];
         }
 
diff --git a/config/price_providers.php b/config/price_providers.php
index 60acc5d..7fc0b06 100644
--- a/config/price_providers.php
+++ b/config/price_providers.php
@@ -16,8 +16,8 @@ return [
     'etehadie_api_url' => 'http://109.122.246.48:4949/api/free',
     'zaarbox_api_url' => 'https://price.zaarbox.ir/api/free',
     'zaarbox_price_key' => '',
-    /** UUID سری زمانی نمودار — GET /api/history/{id} */
-    'zaarbox_gold_history_id' => 'ca3800a0-1f57-3528-b963-178f9168e04f',
+    /** UUID نمودار Zaarbox — خالی = پیش‌فرض ca3800a0-... در ZaarboxPriceService */
+    'chart_id' => '',
     'price_method' => '',
     'register_jibit_verify' => false,
     'register_referral_sms_to_referrer' => false,
diff --git a/database/sql/goldali_zaarbox_price.sql b/database/sql/goldali_zaarbox_price.sql
index e92abcc..3f98287 100644
--- a/database/sql/goldali_zaarbox_price.sql
+++ b/database/sql/goldali_zaarbox_price.sql
@@ -20,6 +20,11 @@ SELECT 'zaarbox_price_key', 'estjt_41670cdf0270a874b68a0a95a235f9a1', 'شناس
 WHERE NOT EXISTS (SELECT 1 FROM `settings` WHERE `key` = 'zaarbox_price_key' LIMIT 1);
 UPDATE `settings` SET `value` = 'estjt_41670cdf0270a874b68a0a95a235f9a1' WHERE `key` = 'zaarbox_price_key';
 
+-- نمودار: chart_id = UUID از /api/history/{id} — اگر خالی باشد ca3800a0-1f57-3528-b963-178f9168e04f
+INSERT INTO `settings` (`key`, `value`, `title_fa`, `can_edit`, `is_active`, `description`)
+SELECT 'chart_id', '', 'UUID نمودار Zaarbox', 1, 1, 'خالی = پیش‌فرض آبشده گلد علی'
+WHERE NOT EXISTS (SELECT 1 FROM `settings` WHERE `key` = 'chart_id' LIMIT 1);
+
 COMMIT;
 
 -- بعد: GET /api/price/last