fix docs

MIGRATION_WORKFLOW.md

@@ -338,6 +338,33 @@ CREATE TABLE rawdatacor_2024 PARTITION OF rawdatacor
 
 PostgreSQL automatically routes INSERTs to the correct partition based on `event_year`.
 
+### Indexes in PostgreSQL
+
+Both tables have these indexes automatically created:
+
+**Primary Key** (required for partitioned tables):
+```sql
+-- Must include partition key (event_year)
+UNIQUE (id, event_year)
+```
+
+**Consolidation Key** (prevents duplicates):
+```sql
+-- Ensures one record per consolidation group
+UNIQUE (unit_name, tool_name_id, event_timestamp, event_year)
+```
+
+**Query Optimization**:
+```sql
+-- Fast filtering by unit/tool
+(unit_name, tool_name_id)
+
+-- JSONB queries with GIN index
+GIN (measurements)
+```
+
+**Note**: All indexes are automatically created on all partitions when you run `setup --create-schema`.
+
 ---
 
 ## Summary