diff --git a/scripts/migrate_phase3_mobile.php b/scripts/migrate_phase3_mobile.php
index fb9e086..5a26e0c 100644
--- a/scripts/migrate_phase3_mobile.php
+++ b/scripts/migrate_phase3_mobile.php
@@ -22,13 +22,23 @@ echo "  مُصادَق — Phase 3 Migration\n";
 echo "  Mobile App + Batch Processing Support\n";
 echo "═══════════════════════════════════════════\n\n";
 
+// --- Fetch Parent Collation dynamically ---
+$stmt = $db->query("SHOW FULL COLUMNS FROM users WHERE Field = 'id'");
+$userCol = $stmt->fetch(PDO::FETCH_ASSOC);
+$charsetCollation = "";
+if ($userCol && !empty($userCol['Collation'])) {
+    $collation = $userCol['Collation'];
+    list($charset) = explode('_', $collation);
+    $charsetCollation = "CHARACTER SET {$charset} COLLATE {$collation}";
+}
+
 $migrations = [
 
     // ─── 1. User Device Management ─────────────────────────
     'create_user_devices' => "
         CREATE TABLE IF NOT EXISTS user_devices (
-            id CHAR(36) PRIMARY KEY DEFAULT (UUID()),
-            user_id CHAR(36) NOT NULL,
+            id CHAR(36) {$charsetCollation} PRIMARY KEY DEFAULT (UUID()),
+            user_id CHAR(36) {$charsetCollation} NOT NULL,
             device_fingerprint VARCHAR(64) NOT NULL,
             device_name VARCHAR(100) NULL,
             platform ENUM('android','ios','web') NOT NULL DEFAULT 'android',
@@ -55,10 +65,10 @@ $migrations = [
     // ─── 3. Invoice Batches (Mobile Scanner) ───────────────
     'create_invoice_batches' => "
         CREATE TABLE IF NOT EXISTS invoice_batches (
-            id CHAR(36) PRIMARY KEY,
-            tenant_id CHAR(36) NOT NULL,
-            company_id CHAR(36) NOT NULL,
-            uploaded_by CHAR(36) NOT NULL,
+            id CHAR(36) {$charsetCollation} PRIMARY KEY,
+            tenant_id CHAR(36) {$charsetCollation} NOT NULL,
+            company_id CHAR(36) {$charsetCollation} NOT NULL,
+            uploaded_by CHAR(36) {$charsetCollation} NOT NULL,
             total_images INT NOT NULL DEFAULT 0,
             processed_images INT NOT NULL DEFAULT 0,
             failed_images INT NOT NULL DEFAULT 0,
@@ -81,10 +91,10 @@ $migrations = [
     'create_processing_queue' => "
         CREATE TABLE IF NOT EXISTS invoice_processing_queue (
             id INT AUTO_INCREMENT PRIMARY KEY,
-            batch_id CHAR(36) NOT NULL,
-            invoice_id CHAR(36) NULL,
-            tenant_id CHAR(36) NOT NULL,
-            company_id CHAR(36) NOT NULL,
+            batch_id CHAR(36) {$charsetCollation} NOT NULL,
+            invoice_id CHAR(36) {$charsetCollation} NULL,
+            tenant_id CHAR(36) {$charsetCollation} NOT NULL,
+            company_id CHAR(36) {$charsetCollation} NOT NULL,
             image_path VARCHAR(500) NOT NULL,
             image_order INT NOT NULL DEFAULT 0,
             status ENUM('pending','processing','done','failed') DEFAULT 'pending',
@@ -106,9 +116,9 @@ $migrations = [
     // ─── 6. Notifications Table ────────────────────────────
     'create_notifications' => "
         CREATE TABLE IF NOT EXISTS notifications (
-            id CHAR(36) PRIMARY KEY DEFAULT (UUID()),
-            tenant_id CHAR(36) NOT NULL,
-            user_id CHAR(36) NULL,
+            id CHAR(36) {$charsetCollation} PRIMARY KEY DEFAULT (UUID()),
+            tenant_id CHAR(36) {$charsetCollation} NOT NULL,
+            user_id CHAR(36) {$charsetCollation} NULL,
             type VARCHAR(50) NOT NULL,
             title VARCHAR(255) NOT NULL,
             body TEXT NULL,