diff --git a/conductor/tracks/mma_data_architecture_dag_engine/plan.md b/conductor/tracks/mma_data_architecture_dag_engine/plan.md
index e4af4fa..1a2d2ce 100644
--- a/conductor/tracks/mma_data_architecture_dag_engine/plan.md
+++ b/conductor/tracks/mma_data_architecture_dag_engine/plan.md
@@ -1,7 +1,7 @@
 # Implementation Plan: MMA Data Architecture & DAG Engine
 
 ## Phase 1: Track-Scoped State Management
-- [ ] Task: Define the data schema for a Track (Metadata, Discussion History, Task List).
+- [x] Task: Define the data schema for a Track (Metadata, Discussion History, Task List). [2efe80e]
 - [ ] Task: Update `project_manager.py` to create and read from `tracks/<track_id>/state.toml`.
 - [ ] Task: Ensure Tier 2 (Tech Lead) history is securely scoped to the active track's state file.