diff --git a/package-lock.json b/package-lock.json
index a6c55b9..5621e01 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "oikos",
-  "version": "0.43.0",
+  "version": "0.44.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "oikos",
-      "version": "0.43.0",
+      "version": "0.44.0",
       "license": "MIT",
       "dependencies": {
         "bcrypt": "^6.0.0",
diff --git a/server/db.js b/server/db.js
index 3d8b6be..dc883b3 100644
--- a/server/db.js
+++ b/server/db.js
@@ -1006,8 +1006,6 @@ const MIGRATIONS = [
         // Update external_calendars source
         db.prepare(`UPDATE external_calendars SET source='caldav' WHERE source='apple'`).run();
 
-        // Update calendar_events external_source
-        db.prepare(`UPDATE calendar_events SET external_source='caldav' WHERE external_source='apple'`).run();
       }
 
       // Add caldav to external_source CHECK constraint by recreating table
@@ -1050,8 +1048,9 @@ const MIGRATIONS = [
            attachment_name, attachment_mime, attachment_size, attachment_data,
            created_at, updated_at)
         SELECT id, title, description, start_datetime, end_datetime, all_day, location, color,
-               assigned_to, created_by, external_calendar_id, external_source, recurrence_rule,
-               subscription_id, user_modified, calendar_ref_id, icon,
+               assigned_to, created_by, external_calendar_id,
+               CASE WHEN external_source = 'apple' THEN 'caldav' ELSE external_source END,
+               recurrence_rule, subscription_id, user_modified, calendar_ref_id, icon,
                attachment_name, attachment_mime, attachment_size, attachment_data,
                created_at, updated_at
         FROM calendar_events
diff --git a/test-caldav-sync.js b/test-caldav-sync.js
index 7dba725..ee5ca46 100644
--- a/test-caldav-sync.js
+++ b/test-caldav-sync.js
@@ -153,4 +153,40 @@ describe('CalDAV Multi-Account Sync', () => {
     assert.strictEqual(enabled.length, 1, 'Should have 1 enabled calendar');
     assert.strictEqual(enabled[0].calendar_name, 'Private');
   });
+
+  it('should migrate apple calendar events to caldav without violating CHECK', () => {
+    const db2 = new DatabaseSync(':memory:');
+    db2.exec(`
+      CREATE TABLE calendar_events (
+        id              INTEGER PRIMARY KEY AUTOINCREMENT,
+        title           TEXT NOT NULL,
+        external_source TEXT NOT NULL DEFAULT 'local'
+                        CHECK(external_source IN ('local', 'google', 'apple', 'ics'))
+      );
+    `);
+
+    db2.prepare(`
+      INSERT INTO calendar_events (title, external_source)
+      VALUES ('Migrated', 'apple')
+    `).run();
+
+    db2.exec(`
+      CREATE TABLE calendar_events_new (
+        id              INTEGER PRIMARY KEY AUTOINCREMENT,
+        title           TEXT NOT NULL,
+        external_source TEXT NOT NULL DEFAULT 'local'
+                        CHECK(external_source IN ('local', 'google', 'apple', 'ics', 'caldav'))
+      );
+    `);
+
+    db2.exec(`
+      INSERT INTO calendar_events_new (id, title, external_source)
+      SELECT id, title,
+             CASE WHEN external_source = 'apple' THEN 'caldav' ELSE external_source END
+      FROM calendar_events
+    `);
+
+    const migrated = db2.prepare(`SELECT external_source FROM calendar_events_new WHERE title = 'Migrated'`).get();
+    assert.strictEqual(migrated.external_source, 'caldav');
+  });
 });