diff --git a/e2e-tests/src/main/java/gov/nasa/jpl/aerie/e2e/procedural/scheduling/procedures/ActivityDeletionGoal.java b/e2e-tests/src/main/java/gov/nasa/jpl/aerie/e2e/procedural/scheduling/procedures/ActivityDeletionGoal.java
index f9242bf14e..9c4f12a315 100644
--- a/e2e-tests/src/main/java/gov/nasa/jpl/aerie/e2e/procedural/scheduling/procedures/ActivityDeletionGoal.java
+++ b/e2e-tests/src/main/java/gov/nasa/jpl/aerie/e2e/procedural/scheduling/procedures/ActivityDeletionGoal.java
@@ -15,9 +15,10 @@
 /**
  * Creates three activities in a chain of anchors, then deletes one.
  * If `whichToDelete` is negative, this leaves all three activities.
+ * If `rollback` is true, this will roll the edit back before finishing.
  */
 @SchedulingProcedure
-public record ActivityDeletionGoal(int whichToDelete, DeletedAnchorStrategy anchorStrategy) implements Goal {
+public record ActivityDeletionGoal(int whichToDelete, DeletedAnchorStrategy anchorStrategy, boolean rollback) implements Goal {
   @Override
   public void run(@NotNull final EditablePlan plan) {
     final var ids = new ActivityDirectiveId[3];
@@ -42,6 +43,7 @@ public void run(@NotNull final EditablePlan plan) {
       plan.delete(ids[whichToDelete], anchorStrategy);
     }
 
-    plan.commit();
+    if (rollback) plan.rollback();
+    else plan.commit();
   }
 }
diff --git a/e2e-tests/src/test/java/gov/nasa/jpl/aerie/e2e/procedural/scheduling/DeletionTests.java b/e2e-tests/src/test/java/gov/nasa/jpl/aerie/e2e/procedural/scheduling/DeletionTests.java
index 5e38b57b19..9cd51f98f5 100644
--- a/e2e-tests/src/test/java/gov/nasa/jpl/aerie/e2e/procedural/scheduling/DeletionTests.java
+++ b/e2e-tests/src/test/java/gov/nasa/jpl/aerie/e2e/procedural/scheduling/DeletionTests.java
@@ -42,6 +42,7 @@ void createsThreeActivities() throws IOException {
         .createObjectBuilder()
         .add("whichToDelete", -1)
         .add("anchorStrategy", "Error")
+        .add("rollback", false)
         .build();
 
     hasura.updateSchedulingSpecGoalArguments(procedureId.invocationId(), args);
@@ -82,6 +83,7 @@ void deletesLast() throws IOException {
         .createObjectBuilder()
         .add("whichToDelete", 2)
         .add("anchorStrategy", "Error")
+        .add("rollback", false)
         .build();
 
     hasura.updateSchedulingSpecGoalArguments(procedureId.invocationId(), args);
@@ -113,6 +115,7 @@ void deletesMiddleCascade() throws IOException {
         .createObjectBuilder()
         .add("whichToDelete", 1)
         .add("anchorStrategy", "Cascade")
+        .add("rollback", false)
         .build();
 
     hasura.updateSchedulingSpecGoalArguments(procedureId.invocationId(), args);
@@ -134,7 +137,8 @@ void deletesMiddleAnchorToParent() throws IOException {
     final var args = Json
         .createObjectBuilder()
         .add("whichToDelete", 1)
-        .add("anchorStrategy", "ReAnchor")
+        .add("anchorStrategy", "PreserveTree")
+        .add("rollback", false)
         .build();
 
     hasura.updateSchedulingSpecGoalArguments(procedureId.invocationId(), args);
@@ -168,6 +172,7 @@ void deletesFirstCascade() throws IOException {
         .createObjectBuilder()
         .add("whichToDelete", 0)
         .add("anchorStrategy", "Cascade")
+        .add("rollback", false)
         .build();
 
     hasura.updateSchedulingSpecGoalArguments(procedureId.invocationId(), args);
@@ -185,7 +190,8 @@ void deletesFirstReAnchorToPlan() throws IOException {
     final var args = Json
         .createObjectBuilder()
         .add("whichToDelete", 0)
-        .add("anchorStrategy", "ReAnchor")
+        .add("anchorStrategy", "PreserveTree")
+        .add("rollback", false)
         .build();
 
     hasura.updateSchedulingSpecGoalArguments(procedureId.invocationId(), args);
@@ -212,4 +218,45 @@ void deletesFirstReAnchorToPlan() throws IOException {
         it -> Objects.equals(it.type(), "BiteBanana") && Objects.equals(it.anchorId(), id2.get())
     ));
   }
+
+  @Test
+  void anchorResetOnRollback() throws IOException {
+    final var args = Json
+        .createObjectBuilder()
+        .add("whichToDelete", 1)
+        .add("anchorStrategy", "PreserveTree")
+        .add("rollback", true)
+        .build();
+
+    hasura.updateSchedulingSpecGoalArguments(procedureId.invocationId(), args);
+
+    hasura.awaitScheduling(specId);
+
+    final var plan = hasura.getPlan(planId);
+    final var activities = plan.activityDirectives();
+
+    assertEquals(3, activities.size());
+
+    final AtomicReference<Integer> id1 = new AtomicReference<>();
+    final AtomicReference<Integer> id2 = new AtomicReference<>();
+    assertTrue(activities.stream().anyMatch(
+        it -> {
+          final var result = Objects.equals(it.type(), "BiteBanana") && Objects.equals(it.anchorId(), null);
+          if (result) id1.set(it.id());
+          return result;
+        }
+    ));
+
+    assertTrue(activities.stream().anyMatch(
+        it -> {
+          final var result = Objects.equals(it.type(), "BiteBanana") && Objects.equals(it.anchorId(), id1.get());
+          if (result) id2.set(it.id());
+          return result;
+        }
+    ));
+
+    assertTrue(activities.stream().anyMatch(
+        it -> Objects.equals(it.type(), "BiteBanana") && Objects.equals(it.anchorId(), id2.get())
+    ));
+  }
 }
diff --git a/scheduler-server/src/main/java/gov/nasa/jpl/aerie/scheduler/server/services/GraphQLMerlinDatabaseService.java b/scheduler-server/src/main/java/gov/nasa/jpl/aerie/scheduler/server/services/GraphQLMerlinDatabaseService.java
index 5c31c7eee9..43c1a8c9fb 100644
--- a/scheduler-server/src/main/java/gov/nasa/jpl/aerie/scheduler/server/services/GraphQLMerlinDatabaseService.java
+++ b/scheduler-server/src/main/java/gov/nasa/jpl/aerie/scheduler/server/services/GraphQLMerlinDatabaseService.java
@@ -442,6 +442,20 @@ public Map<ActivityDirectiveId, ActivityDirectiveId> updatePlanActivityDirective
             activity.anchoredToStart()
         );
         if (!activityDirectiveFromSchedulingDirective.equals(actFromInitialPlan.get())) {
+          final var newState = activityDirectiveFromSchedulingDirective.serializedActivity();
+          final var oldState = actFromInitialPlan.get().serializedActivity();
+          if (!Objects.equals(newState.getTypeName(), oldState.getTypeName())) {
+            throw new IllegalStateException(
+                "Modified activities cannot change type. Was " + oldState.getTypeName()
+                + ", now " + newState.getTypeName()
+            );
+          }
+          if (!Objects.equals(newState.getArguments(), oldState.getArguments())) {
+            throw new IllegalStateException(
+                "Modified activities cannot change arguments. Was " + oldState.getArguments()
+                + ", now " + newState.getArguments()
+            );
+          }
           toModify.add(activity);
         }
         ids.put(activity.id(), activity.id());