Import/calculations improvements

inventory-server/scripts/import/daily-deals.js

@@ -24,7 +24,8 @@ async function importDailyDeals(prodConnection, localConnection) {
   const startTime = Date.now();
 
   try {
-    await localConnection.query('BEGIN');
+    // Wrapper's beginTransaction() pins a dedicated client; query('BEGIN') would not.
+    await localConnection.beginTransaction();
 
     // Fetch recent daily deals from production (MySQL 5.7, no CTEs)
     // Join product_current_prices to get the actual deal price
@@ -127,7 +128,7 @@ async function importDailyDeals(prodConnection, localConnection) {
         last_sync_timestamp = NOW()
     `);
 
-    await localConnection.query('COMMIT');
+    await localConnection.commit();
 
     outputProgress({
       status: "complete",
@@ -149,7 +150,7 @@ async function importDailyDeals(prodConnection, localConnection) {
     console.error("Error importing daily deals:", error);
 
     try {
-      await localConnection.query('ROLLBACK');
+      await localConnection.rollback();
     } catch (rollbackError) {
       console.error("Error during rollback:", rollbackError);
     }