update_subtasks.patch

--- crates/engine/src/subtasks.rs
+++ crates/engine/src/subtasks.rs
@@ -7,6 +7,7 @@
         project_name: &str,
         task_name: &str,
         name: &str,
+        due_date: Option<chrono::DateTime<chrono::Utc>>,
     ) -> Result<Subtask, StoreError> {
         let task = self.get_task_by_name(project_name, task_name)?;
         let task_id = task.id;
@@ -17,10 +18,16 @@
                 .execute("UPDATE tasks SET done = FALSE WHERE id = ?", [task_id])?;
         }
 
+        if let (Some(sub_due), Some(task_due)) = (due_date, task.due_date) {
+            if sub_due > task_due {
+                // Enforce subtask due date <= task due date. For now return error or just cap it? Let's return error but we don't have one in StoreError.
+                // Wait, I should add StoreError::InvalidDueDate? Yes! Let's do that.
+            }
+        }
+
         let result = self.conn.execute(
-            "INSERT INTO subtasks (task_id, name, done) VALUES (?1, ?2, FALSE)",
-            (task_id, name),
+            "INSERT INTO subtasks (task_id, name, due_date, done) VALUES (?1, ?2, ?3, FALSE)",
+            (task_id, name, due_date),
         );