diff --git a/conf/db/upgrade/V5.5.12__schema.sql b/conf/db/upgrade/V5.5.12__schema.sql
new file mode 100644
index 0000000000..26b5dcb65b
--- /dev/null
+++ b/conf/db/upgrade/V5.5.12__schema.sql
@@ -0,0 +1,42 @@
+-- ZSTAC-73546: Migrate existing global GPU quota to per-vendor (NVIDIA) quota
+-- For users who already set container.gpu.video.ram.size, copy the value as NVIDIA vendor quota.
+-- Other vendor quotas will use the GlobalConfig default (32GB) via the quota framework.
+DELIMITER $$
+
+CREATE PROCEDURE MigrateGpuQuotaPerVendor()
+BEGIN
+    DECLARE done INT DEFAULT FALSE;
+    DECLARE v_identity_uuid VARCHAR(32);
+    DECLARE v_identity_type VARCHAR(255);
+    DECLARE v_value BIGINT;
+    DECLARE cur CURSOR FOR
+        SELECT `identityUuid`, `identityType`, `value`
+        FROM `QuotaVO`
+        WHERE `name` = 'container.gpu.video.ram.size';
+    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
+
+    OPEN cur;
+    read_loop: LOOP
+        FETCH cur INTO v_identity_uuid, v_identity_type, v_value;
+        IF done THEN
+            LEAVE read_loop;
+        END IF;
+
+        INSERT IGNORE INTO `QuotaVO` (`uuid`, `name`, `identityUuid`, `identityType`, `value`, `lastOpDate`, `createDate`)
+        VALUES (
+            REPLACE(UUID(), '-', ''),
+            'container.gpu.video.ram.size.nvidia',
+            v_identity_uuid,
+            v_identity_type,
+            v_value,
+            NOW(),
+            NOW()
+        );
+    END LOOP;
+    CLOSE cur;
+END$$
+
+DELIMITER ;
+
+CALL MigrateGpuQuotaPerVendor();
+DROP PROCEDURE IF EXISTS MigrateGpuQuotaPerVendor;