scheduled prompts: add/remove targets on edit (#474 fast-follow)

hive-c0re/src/dashboard.rs

@@ -1509,6 +1509,17 @@ struct EditScheduleForm {
     interval_seconds: Option<Option<u64>>,
     #[serde(default)]
     next_fire_at_unix: Option<i64>,
+    /// New targets to add. Replace-on-conflict: re-adding a
+    /// previously-cancelled target drops the tombstone and the
+    /// target starts fresh (operator intent on re-add = "this
+    /// target is active again, fresh start").
+    #[serde(default)]
+    targets_add: Option<Vec<String>>,
+    /// Targets to cancel. Same path as `cancel_targets`:
+    /// tombstones preserve audit and the parent schedule
+    /// auto-cancels when no active targets remain.
+    #[serde(default)]
+    targets_remove: Option<Vec<String>>,
 }
 
 /// serde adaptor: turns missing-key into `None`, explicit-null
@@ -1543,6 +1554,8 @@ async fn patch_schedule(
         description: form.description,
         interval_seconds: form.interval_seconds,
         next_fire_at_unix: form.next_fire_at_unix,
+        targets_add: form.targets_add,
+        targets_remove: form.targets_remove,
     };
     if let Err(e) = state.coord.scheduled_prompts.update(id, patch) {
         return error_response(&format!("edit schedule {id}: {e:#}"));