diff --git a/PLAN.md b/PLAN.md
index 4d3cdf7..6a7aea0 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -144,13 +144,13 @@ Check off items as completed. Each phase builds on the previous.
 ## Phase 4: Products & Feed
 
 ### Step 4.1: Feed Inventory Schema & Purchase
-- [ ] Create migration for feed_inventory table
-- [ ] Create `projections/feed.py` with FeedInventoryProjection
-- [ ] Implement apply_feed_purchased (increment purchased_kg, update price)
-- [ ] Implement revert_feed_purchased
-- [ ] Create `services/feed.py` with purchase_feed function
-- [ ] Write tests: purchase increments, price stored as cents, revert works
-- [ ] **Commit checkpoint**
+- [x] Create migration for feed_inventory table
+- [x] Create `projections/feed.py` with FeedInventoryProjection
+- [x] Implement apply_feed_purchased (increment purchased_kg, update price)
+- [x] Implement revert_feed_purchased
+- [x] Create `services/feed.py` with purchase_feed function
+- [x] Write tests: purchase increments, price stored as cents, revert works
+- [x] **Commit checkpoint** (5c10a75)
 
 ### Step 4.2: Feed Given Event
 - [ ] Implement apply_feed_given (increment given_kg, decrement balance)