Add CleanupUnusedLocationsMaintenanceJob

ProjectLighthouse/Maintenance/MaintenanceJobs/CleanupUnusedLocationsMaintenanceJob.cs

@@ -0,0 +1,24 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace LBPUnion.ProjectLighthouse.Maintenance.MaintenanceJobs
+{
+    public class CleanupUnusedLocationsMaintenanceJob : IMaintenanceJob
+    {
+        private readonly Database database = new();
+        public string Name() => "Cleanup Unused Locations";
+        public string Description() => "Cleanup unused locations in the database.";
+
+        public Task Run()
+        {
+            List<int> usedLocationIds = new();
+
+            usedLocationIds.AddRange(this.database.Slots.Select(slot => slot.LocationId));
+            usedLocationIds.AddRange(this.database.Users.Select(user => user.LocationId));
+
+            this.database.RemoveRange(this.database.Locations.Where(l => !usedLocationIds.Contains(l.Id)));
+            return Task.CompletedTask;
+        }
+    }
+}