Filter sensor types by distinct values

backend/api/Controllers/Models/EchoInspection.cs

@@ -37,4 +37,26 @@ private static InspectionType InspectionTypeFromEchoSensorType(string sensorType
             };
         }
     }
+
+    public class EchoInspectionComparer : IEqualityComparer<EchoInspection>
+    {
+        public bool Equals(EchoInspection? e1, EchoInspection? e2)
+        {
+            if (ReferenceEquals(e1, e2))
+                return true;
+
+            if (e2 is null || e1 is null)
+                return false;
+
+            return e1.InspectionType == e2.InspectionType
+                && e1.TimeInSeconds == e2.TimeInSeconds;
+        }
+
+        public int GetHashCode(EchoInspection e)
+        {
+            // We cannot incorporate TimeInSeconds here are SQL queries do not handle 
+            // nullables even with short circuiting logic
+            return (int)e.InspectionType;
+        }
+    }
 }

backend/api/Services/EchoService.cs

@@ -137,8 +137,7 @@ private List<EchoTag> ProcessPlanItems(List<PlanItem> planItems, string installa
                         $"https://stid.equinor.com/{installationCode}/tag?tagNo={planItem.Tag}"
                     ),
                     Inspections = planItem.SensorTypes
-                        .Select(sensor => new EchoInspection(sensor))
-                        .ToList()
+                        .Select(sensor => new EchoInspection(sensor)).Distinct(new EchoInspectionComparer()).ToList()
                 };
 
                 if (tag.Inspections.IsNullOrEmpty())

frontend/src/language/en.json

@@ -174,5 +174,6 @@
     "Custom": "Custom",
     "Hours between inspections": "Hours between inspections",
     "Days between inspections": "Days between inspections",
-    "Confirm plant": "Confirm plant"
+    "Confirm plant": "Confirm plant",
+    "N": "N"
 }

frontend/src/language/no.json

@@ -174,5 +174,6 @@
     "No planned inspection": "Ingen inspeksjon planlagt",
     "Hours between inspections": "Timer mellom inspeksjoner",
     "Days between inspections": "Dager mellom inspeksjoner",
-    "Confirm plant": "Bekreft anlegg"
+    "Confirm plant": "Bekreft anlegg",
+    "N": "N"
 }