diff --git a/Services/ServiceTrackerDataStore.cs b/Services/ServiceTrackerDataStore.cs
index 0fb2a95..bb7a992 100644
--- a/Services/ServiceTrackerDataStore.cs
+++ b/Services/ServiceTrackerDataStore.cs
@@ -7,15 +7,12 @@ using System.Linq;
 
 namespace Disco.Plugins.ServiceTracker.Services
 {
-    /// <summary>
-    /// JSON file-based data store for ServiceTracker metadata.
-    /// Stores ticket extensions and configuration in the plugin data directory.
-    /// </summary>
     public class ServiceTrackerDataStore
     {
         private readonly string _dataDirectory;
         private readonly string _ticketsPath;
         private readonly string _configPath;
+        private readonly string _externalPath;
         private static readonly object _lock = new object();
 
         public ServiceTrackerDataStore(string pluginDataDirectory)
@@ -23,11 +20,12 @@ namespace Disco.Plugins.ServiceTracker.Services
             _dataDirectory = pluginDataDirectory;
             _ticketsPath = Path.Combine(_dataDirectory, "tickets.json");
             _configPath = Path.Combine(_dataDirectory, "config.json");
-
-            if (!Directory.Exists(_dataDirectory))
-                Directory.CreateDirectory(_dataDirectory);
+            _externalPath = Path.Combine(_dataDirectory, "external_tickets.json");
+            if (!Directory.Exists(_dataDirectory)) Directory.CreateDirectory(_dataDirectory);
         }
 
+        public string DataDirectory { get { return _dataDirectory; } }
+
         // --- Configuration ---
 
         public ServiceTrackerConfig LoadConfig()
@@ -36,12 +34,19 @@ namespace Disco.Plugins.ServiceTracker.Services
             {
                 if (!File.Exists(_configPath))
                 {
-                    var defaultConfig = ServiceTrackerConfig.CreateDefault();
-                    SaveConfig(defaultConfig);
-                    return defaultConfig;
+                    var def = ServiceTrackerConfig.CreateDefault();
+                    SaveConfig(def);
+                    return def;
                 }
                 var json = File.ReadAllText(_configPath);
-                return JsonConvert.DeserializeObject<ServiceTrackerConfig>(json) ?? ServiceTrackerConfig.CreateDefault();
+                var config = JsonConvert.DeserializeObject<ServiceTrackerConfig>(json);
+                if (config == null) return ServiceTrackerConfig.CreateDefault();
+                // Ensure new fields have defaults
+                if (config.Technicians == null) config.Technicians = new List<TechEntry>();
+                if (config.GoogleSheet == null) config.GoogleSheet = new GoogleSheetConfig();
+                if (string.IsNullOrEmpty(config.DiscoBaseUrl)) config.DiscoBaseUrl = "http://disco:9292";
+                if (config.DetailInactivitySeconds <= 0) config.DetailInactivitySeconds = 300;
+                return config;
             }
         }
 
@@ -54,15 +59,13 @@ namespace Disco.Plugins.ServiceTracker.Services
             }
         }
 
-        // --- Tickets ---
+        // --- Disco Tickets ---
 
         public List<ServiceTicket> LoadAllTickets()
         {
             lock (_lock)
             {
-                if (!File.Exists(_ticketsPath))
-                    return new List<ServiceTicket>();
-
+                if (!File.Exists(_ticketsPath)) return new List<ServiceTicket>();
                 var json = File.ReadAllText(_ticketsPath);
                 return JsonConvert.DeserializeObject<List<ServiceTicket>>(json) ?? new List<ServiceTicket>();
             }
@@ -78,14 +81,9 @@ namespace Disco.Plugins.ServiceTracker.Services
             lock (_lock)
             {
                 var tickets = LoadAllTicketsUnsafe();
-                var existing = tickets.FindIndex(t => t.JobId == ticket.JobId);
+                var idx = tickets.FindIndex(t => t.JobId == ticket.JobId);
                 ticket.LastModifiedDate = DateTime.Now;
-
-                if (existing >= 0)
-                    tickets[existing] = ticket;
-                else
-                    tickets.Add(ticket);
-
+                if (idx >= 0) tickets[idx] = ticket; else tickets.Add(ticket);
                 SaveAllTicketsUnsafe(tickets);
             }
         }
@@ -108,8 +106,7 @@ namespace Disco.Plugins.ServiceTracker.Services
                 var ticket = tickets.FirstOrDefault(t => t.JobId == jobId);
                 if (ticket != null)
                 {
-                    if (ticket.Notes == null)
-                        ticket.Notes = new List<TicketNote>();
+                    if (ticket.Notes == null) ticket.Notes = new List<TicketNote>();
                     ticket.Notes.Add(note);
                     ticket.LastModifiedDate = DateTime.Now;
                     SaveAllTicketsUnsafe(tickets);
@@ -117,19 +114,79 @@ namespace Disco.Plugins.ServiceTracker.Services
             }
         }
 
-        // Internal methods (caller must hold lock)
+        // --- External Tickets (Google Sheet) ---
+
+        public List<ServiceTicket> LoadExternalTickets()
+        {
+            lock (_lock)
+            {
+                if (!File.Exists(_externalPath)) return new List<ServiceTicket>();
+                var json = File.ReadAllText(_externalPath);
+                return JsonConvert.DeserializeObject<List<ServiceTicket>>(json) ?? new List<ServiceTicket>();
+            }
+        }
+
+        public void SaveExternalTickets(List<ServiceTicket> tickets)
+        {
+            lock (_lock)
+            {
+                var json = JsonConvert.SerializeObject(tickets, Formatting.Indented);
+                File.WriteAllText(_externalPath, json);
+            }
+        }
+
+        public ServiceTicket GetExternalTicket(int internalId)
+        {
+            return LoadExternalTickets().FirstOrDefault(t => t.JobId == internalId);
+        }
+
+        public void SaveExternalTicket(ServiceTicket ticket)
+        {
+            lock (_lock)
+            {
+                var tickets = LoadExternalTicketsUnsafe();
+                var idx = tickets.FindIndex(t => t.JobId == ticket.JobId);
+                ticket.LastModifiedDate = DateTime.Now;
+                if (idx >= 0) tickets[idx] = ticket; else tickets.Add(ticket);
+                var json = JsonConvert.SerializeObject(tickets, Formatting.Indented);
+                File.WriteAllText(_externalPath, json);
+            }
+        }
+
+        public void AddExternalNote(int internalId, TicketNote note)
+        {
+            lock (_lock)
+            {
+                var tickets = LoadExternalTicketsUnsafe();
+                var ticket = tickets.FirstOrDefault(t => t.JobId == internalId);
+                if (ticket != null)
+                {
+                    if (ticket.Notes == null) ticket.Notes = new List<TicketNote>();
+                    ticket.Notes.Add(note);
+                    ticket.LastModifiedDate = DateTime.Now;
+                    var json = JsonConvert.SerializeObject(tickets, Formatting.Indented);
+                    File.WriteAllText(_externalPath, json);
+                }
+            }
+        }
+
+        // Internal (caller must hold lock)
         private List<ServiceTicket> LoadAllTicketsUnsafe()
         {
-            if (!File.Exists(_ticketsPath))
-                return new List<ServiceTicket>();
+            if (!File.Exists(_ticketsPath)) return new List<ServiceTicket>();
             var json = File.ReadAllText(_ticketsPath);
             return JsonConvert.DeserializeObject<List<ServiceTicket>>(json) ?? new List<ServiceTicket>();
         }
-
         private void SaveAllTicketsUnsafe(List<ServiceTicket> tickets)
         {
             var json = JsonConvert.SerializeObject(tickets, Formatting.Indented);
             File.WriteAllText(_ticketsPath, json);
         }
+        private List<ServiceTicket> LoadExternalTicketsUnsafe()
+        {
+            if (!File.Exists(_externalPath)) return new List<ServiceTicket>();
+            var json = File.ReadAllText(_externalPath);
+            return JsonConvert.DeserializeObject<List<ServiceTicket>>(json) ?? new List<ServiceTicket>();
+        }
     }
 }