diff --git a/backend/Omnikeeper/GraphQL/TraitEntities/TraitEntityTypes.cs b/backend/Omnikeeper/GraphQL/TraitEntities/TraitEntityTypes.cs
index ed77aba6..342e4dfd 100644
--- a/backend/Omnikeeper/GraphQL/TraitEntities/TraitEntityTypes.cs
+++ b/backend/Omnikeeper/GraphQL/TraitEntities/TraitEntityTypes.cs
@@ -55,6 +55,21 @@ public TraitEntityRootType(ITrait at, IEffectiveTraitModel effectiveTraitModel,
                     var ets = await traitEntityModel.GetByCIID(AllCIIDsSelection.Instance, layerset, trans, timeThreshold);
                     return ets.Select(kv => kv.Value);
                 });
+            Field<ChangesetType>("latestChangeAll")
+                .Description("Note: the implementation that calculates the latest relevant changeset is done rather defensively. That means there are circumstances " +
+                "where this field returns a new/later changeset even though there are no (visible) changes to the trait entities themselves. However, it will never NOT report " +
+                "a new changeset when there have been changes to the trait entities. This behavior makes it reasonably suitable for implementing a client-side cache that only " +
+                "fetches new data when anything has changed")
+                .ResolveAsync(async context =>
+                {
+                    var userContext = (context.UserContext as OmnikeeperUserContext)!;
+                    var layerset = userContext.GetLayerSet(context.Path);
+                    var timeThreshold = userContext.GetTimeThreshold(context.Path);
+                    var trans = userContext.Transaction;
+
+                    // TODO: use dataloader
+                    return await traitEntityModel.GetLatestRelevantChangesetOverallHeuristic(AllCIIDsSelection.Instance, layerset, trans, timeThreshold);
+                });
 
             Field("filtered", new ListGraphType(wrapperElementGraphType))
                 .Arguments(
diff --git a/backend/Tests/Integration/GraphQL/BasicTraitEntityTest.cs b/backend/Tests/Integration/GraphQL/BasicTraitEntityTest.cs
index 09357a5d..3df17d53 100644
--- a/backend/Tests/Integration/GraphQL/BasicTraitEntityTest.cs
+++ b/backend/Tests/Integration/GraphQL/BasicTraitEntityTest.cs
@@ -110,6 +110,10 @@ public async Task TestBasics()
                         assignments { relatedCIID }
                     }
                 }
+                latestChangeAll {
+                    userID
+                    layerID
+                }
             }
         }
     }
@@ -118,7 +122,8 @@ public async Task TestBasics()
 {
   ""traitEntities"": {
 	  ""test_trait_a"": {
-	    ""all"": []
+	    ""all"": [],
+        ""latestChangeAll"": null
 	  }
   }
 }
@@ -166,7 +171,11 @@ public async Task TestBasics()
               }]
             }
           }
-        ]
+        ],
+        ""latestChangeAll"": {
+            ""userID"": " + userInDatabase.ID + @",
+            ""layerID"": ""layer_1""
+        }
 	  }
   }
 }
@@ -213,7 +222,11 @@ public async Task TestBasics()
               }]
             }
           }
-        ]
+        ],
+        ""latestChangeAll"": {
+            ""userID"": " + userInDatabase.ID + @",
+            ""layerID"": ""layer_1""
+        }
 	  }
   }
 }
@@ -284,7 +297,11 @@ public async Task TestBasics()
               }}]
             }}
           }}
-        ]
+        ],
+        ""latestChangeAll"": {{
+            ""userID"": " + userInDatabase.ID + $@",
+            ""layerID"": ""layer_1""
+        }}
 	  }}
   }}
 }}
@@ -325,7 +342,11 @@ public async Task TestBasics()
               }}]
             }}
           }}
-        ]
+        ],
+        ""latestChangeAll"": {{
+            ""userID"": " + userInDatabase.ID + $@",
+            ""layerID"": ""layer_1""
+        }}
 	  }}
   }}
 }}
@@ -380,7 +401,11 @@ public async Task TestBasics()
               }}]
             }}
           }}
-        ]
+        ],
+        ""latestChangeAll"": {{
+            ""userID"": " + userInDatabase.ID + $@",
+            ""layerID"": ""layer_1""
+        }}
 	  }}
   }}
 }}
@@ -432,7 +457,11 @@ public async Task TestBasics()
               }}]
             }}
           }}
-        ]
+        ],
+        ""latestChangeAll"": {{
+            ""userID"": " + userInDatabase.ID + $@",
+            ""layerID"": ""layer_1""
+        }}
 	  }}
   }}
 }}
@@ -462,7 +491,11 @@ public async Task TestBasics()
 {{
   ""traitEntities"": {{
 	  ""test_trait_a"": {{
-	    ""all"": []
+	    ""all"": [],
+        ""latestChangeAll"": {{
+            ""userID"": " + userInDatabase.ID + $@",
+            ""layerID"": ""layer_1""
+        }}
 	  }}
   }}
 }}