diff --git a/migrations/versions/phase48_schedule_parent_inspection.py b/migrations/versions/phase48_schedule_parent_inspection.py
index 5578de6..856e576 100644
--- a/migrations/versions/phase48_schedule_parent_inspection.py
+++ b/migrations/versions/phase48_schedule_parent_inspection.py
@@ -27,9 +27,17 @@ with the same rule, so neither side of the pair can delete the other's history.
 
 Uses INFORMATION_SCHEMA existence checks — safe to re-run on every tenant DB.
 Additive only: nothing is renamed, retyped or dropped.
+
+Revision id note
+----------------
+`alembic_version.version_num` is VARCHAR(32). The descriptive form
+'phase48_schedule_parent_inspection' is 34 characters and fails the stamp UPDATE
+after the DDL has already run. The id is abbreviated to fit, matching the
+single-tenant chain's own 'phase45_sched_parent_insp'. The FILENAME stays
+descriptive — Alembic keys on the `revision` string, not the filename.
 """
 
-revision      = 'phase48_schedule_parent_inspection'
+revision      = 'phase48_sched_parent_insp'
 down_revision = 'phase47_schedule_end_date'
 branch_labels = None
 depends_on    = None