- Declare __table_args__ on Test with 5 indexes: technique_id, state, created_at, (technique_id,state), (state,created_at)
- Declare __table_args__ on AuditLog with 3 indexes: (entity_type,entity_id), timestamp, (entity_type,entity_id,action)
- Alembic b024: create only the 2 new indexes (ix_tests_created_at, ix_tests_state_created_at); existing indexes from b005/b018/b019 are preserved
- Model index names aligned with existing migration names to prevent duplicates
