From c21000e6589d3fa6649000ff19c5da7f0e0e249c Mon Sep 17 00:00:00 2001
From: Yinyin Liu <liu@innov.energy>
Date: Wed, 29 Apr 2026 15:13:08 +0200
Subject: [PATCH] fix: GetTicketSummaries goes from 1 + N queries to 1 + 1

---
 csharp/App/Backend/Controller.cs | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/csharp/App/Backend/Controller.cs b/csharp/App/Backend/Controller.cs
index 6c4f5bee3..4d23b77ef 100644
--- a/csharp/App/Backend/Controller.cs
+++ b/csharp/App/Backend/Controller.cs
@@ -2534,9 +2534,26 @@ public class Controller : ControllerBase
         if (user is null || user.UserType != 2) return Unauthorized();
 
         var tickets = Db.GetAllTickets();
+
+        var installationIds = tickets
+            .Where(t => t.InstallationId.HasValue)
+            .Select(t => t.InstallationId!.Value)
+            .Distinct()
+            .ToList();
+
+        var installationsById = installationIds.Count == 0
+            ? new Dictionary<Int64, Installation>()
+            : Db.Installations
+                .Where(i => installationIds.Contains(i.Id))
+                .ToList()
+                .ToDictionary(i => i.Id);
+
         var summaries = tickets.Select(t =>
         {
-            var installation = t.InstallationId.HasValue ? Db.GetInstallationById(t.InstallationId.Value) : null;
+            Installation? installation = null;
+            if (t.InstallationId.HasValue)
+                installationsById.TryGetValue(t.InstallationId.Value, out installation);
+
             return new
             {
                 t.Id, t.Subject, t.Status, t.Priority, t.Category, t.SubCategory,