diff --git a/migrations/mysql/2026-08-10-120000_add_org_policy_revision_date/down.sql b/migrations/mysql/2026-08-10-120000_add_org_policy_revision_date/down.sql
index e69de29b..27c33623 100644
--- a/migrations/mysql/2026-08-10-120000_add_org_policy_revision_date/down.sql
+++ b/migrations/mysql/2026-08-10-120000_add_org_policy_revision_date/down.sql
@@ -0,0 +1 @@
+ALTER TABLE org_policies DROP COLUMN revision_date;
diff --git a/migrations/mysql/2026-08-10-120000_add_org_policy_revision_date/up.sql b/migrations/mysql/2026-08-10-120000_add_org_policy_revision_date/up.sql
index fc5a5f44..97a84117 100644
--- a/migrations/mysql/2026-08-10-120000_add_org_policy_revision_date/up.sql
+++ b/migrations/mysql/2026-08-10-120000_add_org_policy_revision_date/up.sql
@@ -1,2 +1,7 @@
+-- DATETIME (not TIMESTAMP) to match this repo's convention for revision_date
+-- columns elsewhere, and to avoid MySQL's implicit session-timezone
+-- conversion and 2038 range limit on TIMESTAMP.
 ALTER TABLE org_policies
-ADD COLUMN revision_date TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP;
+ADD COLUMN revision_date DATETIME NOT NULL DEFAULT '1970-01-01 00:00:00';
+
+UPDATE org_policies SET revision_date = UTC_TIMESTAMP();
diff --git a/migrations/postgresql/2026-08-10-120000_add_org_policy_revision_date/down.sql b/migrations/postgresql/2026-08-10-120000_add_org_policy_revision_date/down.sql
index e69de29b..27c33623 100644
--- a/migrations/postgresql/2026-08-10-120000_add_org_policy_revision_date/down.sql
+++ b/migrations/postgresql/2026-08-10-120000_add_org_policy_revision_date/down.sql
@@ -0,0 +1 @@
+ALTER TABLE org_policies DROP COLUMN revision_date;
diff --git a/migrations/postgresql/2026-08-10-120000_add_org_policy_revision_date/up.sql b/migrations/postgresql/2026-08-10-120000_add_org_policy_revision_date/up.sql
index ed39a1d9..44229de2 100644
--- a/migrations/postgresql/2026-08-10-120000_add_org_policy_revision_date/up.sql
+++ b/migrations/postgresql/2026-08-10-120000_add_org_policy_revision_date/up.sql
@@ -1,2 +1,9 @@
+-- Backfill via `now() AT TIME ZONE 'utc'` rather than a DEFAULT of now():
+-- assigning timestamptz now() into a naive TIMESTAMP column casts through
+-- the server's TimeZone GUC, so a DEFAULT now() would store local wall-clock
+-- instead of UTC on non-UTC servers, unlike every other naive-UTC timestamp
+-- column in this schema.
 ALTER TABLE org_policies
-ADD COLUMN revision_date TIMESTAMP NOT NULL DEFAULT now();
+ADD COLUMN revision_date TIMESTAMP NOT NULL DEFAULT '1970-01-01 00:00:00';
+
+UPDATE org_policies SET revision_date = (now() AT TIME ZONE 'utc');
diff --git a/migrations/sqlite/2026-08-10-120000_add_org_policy_revision_date/up.sql b/migrations/sqlite/2026-08-10-120000_add_org_policy_revision_date/up.sql
index 4ab5d2e5..86595711 100644
--- a/migrations/sqlite/2026-08-10-120000_add_org_policy_revision_date/up.sql
+++ b/migrations/sqlite/2026-08-10-120000_add_org_policy_revision_date/up.sql
@@ -1,2 +1,6 @@
+-- SQLite forbids non-constant defaults in ALTER TABLE ... ADD COLUMN, so add
+-- the column with a constant placeholder and backfill separately.
 ALTER TABLE org_policies
-ADD COLUMN revision_date DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP;
+ADD COLUMN revision_date DATETIME NOT NULL DEFAULT '1970-01-01 00:00:00';
+
+UPDATE org_policies SET revision_date = CURRENT_TIMESTAMP;