diff --git a/Services/ConfigService.cs b/Services/ConfigService.cs
index 896fdcc..b8c4370 100644
--- a/Services/ConfigService.cs
+++ b/Services/ConfigService.cs
@@ -13,6 +13,9 @@ namespace UtopiaCanteenSystem.Services;
 /// </summary>
 public class ConfigService : IConfigService
 {
+    private const string DefaultMySqlConnectionString =
+        "SERVER=utopia-industries-rr.c5qech8o9lgg.us-east-1.rds.amazonaws.com;DATABASE=hrms;UID=uind_hrms_user;PASSWORD=UINDHRMS01;";
+
     private readonly string _configPath;
     private AppConfig _config;
 
@@ -232,6 +235,7 @@ public class ConfigService : IConfigService
             {
                 System.Diagnostics.Debug.WriteLine("[ConfigService] Config file not found. Creating with defaults.");
                var defaults = new AppConfig();
+                EnsureConnectionStringDefaults(defaults);
                 SaveConfig(defaults);
                return defaults;
             }
@@ -240,6 +244,9 @@ public class ConfigService : IConfigService
            var config = JsonSerializer.Deserialize<AppConfig>(json);
            config ??= new AppConfig();
             MigrateScanIntervalFromSecondsIfNeeded(config);
+            var changed = EnsureConnectionStringDefaults(config);
+            if (changed)
+                SaveConfig(config);
             
             System.Diagnostics.Debug.WriteLine($"[ConfigService] Config loaded from {_configPath}");
             System.Diagnostics.Debug.WriteLine($"[ConfigService] SiteId: '{config.SiteId}' (empty=not configured)");
@@ -255,6 +262,17 @@ public class ConfigService : IConfigService
         }
     }
 
+    private static bool EnsureConnectionStringDefaults(AppConfig config)
+    {
+        var changed = false;
+        if (string.IsNullOrWhiteSpace(config.MySqlConnectionString))
+        {
+            config.MySqlConnectionString = DefaultMySqlConnectionString;
+            changed = true;
+        }
+        return changed;
+    }
+
     /// <summary>
     /// One-time migration: if old ScanTimeoutSeconds is set and new D/H/M are all zero, convert and persist.
     /// </summary>