diff --git a/PLAN.md b/PLAN.md
index 56e0967..5b8a300 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -31,10 +31,10 @@ Check off items as completed. Each phase builds on the previous.
 - [x] **Commit checkpoint** (7d7cd2b)
 
 ### Step 1.4: Reference Tables Schema
-- [ ] Create migration for species, locations, products, feed_types, users tables
-- [ ] Create Pydantic models for each reference type
-- [ ] Write tests for model validation and constraints
-- [ ] **Commit checkpoint**
+- [x] Create migration for species, locations, products, feed_types, users tables
+- [x] Create Pydantic models for each reference type
+- [x] Write tests for model validation and constraints
+- [x] **Commit checkpoint** (2e28827)
 
 ### Step 1.5: Reference Data Repository & Seeds
 - [ ] Create repositories for each reference type (CRUD operations)