Time unification

inventory-server/src/routes/import.js

@@ -676,7 +676,10 @@ async function setupSshTunnel() {
     password: process.env.PROD_DB_PASSWORD,
     database: process.env.PROD_DB_NAME,
     port: process.env.PROD_DB_PORT || 3306,
-    timezone: 'Z'
+    // DATETIME columns store Central wall-clock literals — return them as
+    // strings; parse with shared/business-time parseMySql() if instants are
+    // ever needed (see docs/TIME.md).
+    dateStrings: true
   };
 
   return new Promise((resolve, reject) => {