diff --git a/PLAN.md b/PLAN.md
index bb58581..a233646 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -100,12 +100,12 @@ Check off items as completed. Each phase builds on the previous.
 - [x] **Commit checkpoint** (739b7bf)
 
 ### Step 3.2: Interval Projections Schema
-- [ ] Create migration for animal_location_intervals
-- [ ] Create migration for animal_tag_intervals
-- [ ] Create migration for animal_attr_intervals
-- [ ] Create Pydantic models for interval types
-- [ ] Write tests for CHECK constraints (end_utc > start_utc)
-- [ ] **Commit checkpoint**
+- [x] Create migration for animal_location_intervals
+- [x] Create migration for animal_tag_intervals
+- [x] Create migration for animal_attr_intervals
+- [x] Create Pydantic models for interval types
+- [x] Write tests for CHECK constraints (end_utc > start_utc)
+- [x] **Commit checkpoint** (e3d6528)
 
 ### Step 3.3: Animal Cohort Creation
 - [ ] Create `projections/animal_registry.py` for cohort creation