diff --git a/src/ChangeLog/ChangeLog.php b/src/ChangeLog/ChangeLog.php
index 73449f8..ef6160f 100644
--- a/src/ChangeLog/ChangeLog.php
+++ b/src/ChangeLog/ChangeLog.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace LIT\MCP\ChangeLog;
 
+use LIT\MCP\Abilities\FollowUp;
 use LIT\MCP\Server\RequestContext;
 
 /**
@@ -44,9 +45,9 @@ class ChangeLog
                 'created_at' => current_time('mysql', true),
                 'user_id' => get_current_user_id(),
                 'client' => $this->sanitizedClientName(),
-                'ability' => $ability,
-                'object_type' => $objectType,
-                'object_id' => $objectId,
+                'ability' => mb_substr($ability, 0, 100),
+                'object_type' => mb_substr($objectType, 0, 50),
+                'object_id' => mb_substr($objectId, 0, 191),
                 'summary' => mb_substr($summary, 0, 500),
                 'revision_id' => $revisionId,
                 'snapshot_id' => $snapshotId,
@@ -64,6 +65,27 @@ class ChangeLog
         return (int) $wpdb->insert_id;
     }
 
+    /**
+     * Logs a write that failed and could not be rolled back completely (result "partial").
+     * Never throws: the caller is already reporting an error, a log failure only goes to
+     * the PHP error log.
+     */
+    public function recordPartial(
+        string $ability,
+        string $objectType,
+        string $objectId,
+        string $summary,
+        ?int $revisionId = null
+    ): void {
+        $ignored = [];
+        FollowUp::run(
+            fn () => $this->record($ability, $objectType, $objectId, $summary, $revisionId, null, 'partial'),
+            $ability . ' change log',
+            '',
+            $ignored
+        );
+    }
+
     public function purgeOlderThan(int $days): int
     {
         $wpdb = $this->db();
diff --git a/src/Integrations/WordPress/Content/ContentCreateAbility.php b/src/Integrations/WordPress/Content/ContentCreateAbility.php
index caf158f..feb590d 100644
--- a/src/Integrations/WordPress/Content/ContentCreateAbility.php
+++ b/src/Integrations/WordPress/Content/ContentCreateAbility.php
@@ -204,12 +204,6 @@ final class ContentCreateAbility implements Ability
 
     private function logPartial(string $postType, string $postId, string $summary): void
     {
-        $ignored = [];
-        FollowUp::run(
-            fn () => $this->log->record($this->name(), $postType, $postId, $summary, null, null, 'partial'),
-            $this->name() . ' change log',
-            '',
-            $ignored
-        );
+        $this->log->recordPartial($this->name(), $postType, $postId, $summary);
     }
 }
diff --git a/src/Integrations/WordPress/Content/ContentUpdateAbility.php b/src/Integrations/WordPress/Content/ContentUpdateAbility.php
index 31a74cb..0ac8692 100644
--- a/src/Integrations/WordPress/Content/ContentUpdateAbility.php
+++ b/src/Integrations/WordPress/Content/ContentUpdateAbility.php
@@ -247,20 +247,12 @@ final class ContentUpdateAbility implements Ability
             throw new WriteFailed(self::REASON, true, $postId, $revisionId, $cause, $detail);
         }
 
-        $ignored = [];
-        FollowUp::run(
-            fn () => $this->log->record(
-                $this->name(),
-                (string) $post->post_type,
-                (string) $postId,
-                sprintf('"%s": Änderung nur teilweise zurückgenommen', $post->post_title),
-                $revisionId,
-                null,
-                'partial'
-            ),
-            $this->name() . ' change log',
-            '',
-            $ignored
+        $this->log->recordPartial(
+            $this->name(),
+            (string) $post->post_type,
+            (string) $postId,
+            sprintf('"%s": Änderung nur teilweise zurückgenommen', $post->post_title),
+            $revisionId
         );
         throw new WriteFailed(
             self::REASON,
diff --git a/src/Integrations/WordPress/Status/PostReplaceWithCopyAbility.php b/src/Integrations/WordPress/Status/PostReplaceWithCopyAbility.php
index 7f2c403..2549d54 100644
--- a/src/Integrations/WordPress/Status/PostReplaceWithCopyAbility.php
+++ b/src/Integrations/WordPress/Status/PostReplaceWithCopyAbility.php
@@ -283,20 +283,12 @@ final class PostReplaceWithCopyAbility implements Ability
         try {
             $this->cloner->restore($original, $snapshot, $parts);
         } catch (Throwable $e) {
-            $ignored = [];
-            FollowUp::run(
-                fn () => $this->log->record(
-                    $this->name(),
-                    (string) $original->post_type,
-                    (string) $originalId,
-                    sprintf('"%s": Austausch nur teilweise zurückgenommen', $original->post_title),
-                    $revisionId,
-                    null,
-                    'partial'
-                ),
-                $this->name() . ' change log',
-                '',
-                $ignored
+            $this->log->recordPartial(
+                $this->name(),
+                (string) $original->post_type,
+                (string) $originalId,
+                sprintf('"%s": Austausch nur teilweise zurückgenommen', $original->post_title),
+                $revisionId
             );
             throw new WriteFailed(
                 self::REASON,
diff --git a/tests/Unit/ChangeLog/ChangeLogTest.php b/tests/Unit/ChangeLog/ChangeLogTest.php
index 1e1df8a..e757dcb 100644
--- a/tests/Unit/ChangeLog/ChangeLogTest.php
+++ b/tests/Unit/ChangeLog/ChangeLogTest.php
@@ -67,6 +67,53 @@ final class ChangeLogTest extends TestCase
         unlink($log);
     }
 
+    public function testRecordTruncatesObjectIdAndAbilityToTheColumnSizes(): void
+    {
+        Functions\when('current_time')->justReturn('2026-09-25 08:00:00');
+        Functions\when('get_current_user_id')->justReturn(3);
+        $db = Mockery::mock(\wpdb::class)->makePartial();
+        $db->expects('insert')
+            ->with('wp_lit_mcp_log', Mockery::on(static function (array $row): bool {
+                return $row['object_id'] === str_repeat('ä', 191) && $row['ability'] === str_repeat('ö', 100);
+            }), Mockery::type('array'))
+            ->andReturn(1);
+
+        (new ChangeLog($db))->record(str_repeat('ö', 150), 'option', str_repeat('ä', 300), 'x');
+    }
+
+    public function testRecordPartialStoresResultPartial(): void
+    {
+        Functions\when('current_time')->justReturn('2026-09-25 08:00:00');
+        Functions\when('get_current_user_id')->justReturn(3);
+        $db = Mockery::mock(\wpdb::class)->makePartial();
+        $db->expects('insert')
+            ->with('wp_lit_mcp_log', Mockery::on(static function (array $row): bool {
+                return $row['result'] === 'partial' && $row['revision_id'] === 7 && $row['object_id'] === '12';
+            }), Mockery::type('array'))
+            ->andReturn(1);
+
+        (new ChangeLog($db))->recordPartial('lit/content-update', 'page', '12', 'teilweise', 7);
+    }
+
+    public function testRecordPartialNeverThrows(): void
+    {
+        Functions\when('current_time')->justReturn('2026-09-25 08:00:00');
+        Functions\when('get_current_user_id')->justReturn(3);
+        $db = Mockery::mock(\wpdb::class)->makePartial();
+        $db->allows('insert')->andThrow(new \RuntimeException('db gone'));
+        $log = (string) tempnam(sys_get_temp_dir(), 'lit-mcp-log');
+        $previous = ini_set('error_log', $log);
+
+        try {
+            (new ChangeLog($db))->recordPartial('lit/menu-set-items', 'nav_menu', '4', 'teilweise');
+        } finally {
+            ini_set('error_log', (string) $previous);
+        }
+
+        self::assertStringContainsString('db gone', (string) file_get_contents($log));
+        unlink($log);
+    }
+
     public function testPurgeDeletesRowsOlderThanTheRetention(): void
     {
         $db = Mockery::mock(\wpdb::class)->makePartial();
diff --git a/tests/Unit/Integrations/WordPress/Content/ContentCreateAbilityTest.php b/tests/Unit/Integrations/WordPress/Content/ContentCreateAbilityTest.php
index 09ab3b3..c104a55 100644
--- a/tests/Unit/Integrations/WordPress/Content/ContentCreateAbilityTest.php
+++ b/tests/Unit/Integrations/WordPress/Content/ContentCreateAbilityTest.php
@@ -134,8 +134,8 @@ final class ContentCreateAbilityTest extends TestCase
         Functions\when('wp_insert_post')->justReturn(42);
         Functions\when('wp_delete_post')->justReturn(false);
         $log = Mockery::mock(ChangeLog::class);
-        $log->expects('record')
-            ->with('lit/content-create', 'lit_person', '42', Mockery::type('string'), null, null, 'partial')
+        $log->expects('recordPartial')
+            ->with('lit/content-create', 'lit_person', '42', Mockery::type('string'))
             ->andReturn(9);
 
         $failure = $this->execute($writer, $log);
@@ -153,7 +153,7 @@ final class ContentCreateAbilityTest extends TestCase
         Functions\when('wp_insert_post')->justReturn(42);
         Functions\when('wp_delete_post')->justReturn(new WP_Post(['ID' => 42]));
         $log = Mockery::mock(ChangeLog::class);
-        $log->expects('record')->andReturn(9);
+        $log->expects('recordPartial');
 
         $failure = $this->execute($writer, $log);
 
@@ -168,8 +168,8 @@ final class ContentCreateAbilityTest extends TestCase
             throw new RuntimeException('save_post hook kaputt');
         });
         $log = Mockery::mock(ChangeLog::class);
-        $log->expects('record')
-            ->with('lit/content-create', 'lit_person', '', Mockery::type('string'), null, null, 'partial')
+        $log->expects('recordPartial')
+            ->with('lit/content-create', 'lit_person', '', Mockery::type('string'))
             ->andReturn(9);
 
         $failure = $this->execute($writer, $log);
diff --git a/tests/Unit/Integrations/WordPress/Content/ContentUpdateAbilityTest.php b/tests/Unit/Integrations/WordPress/Content/ContentUpdateAbilityTest.php
index 12ef0f3..d8f0f09 100644
--- a/tests/Unit/Integrations/WordPress/Content/ContentUpdateAbilityTest.php
+++ b/tests/Unit/Integrations/WordPress/Content/ContentUpdateAbilityTest.php
@@ -261,8 +261,8 @@ final class ContentUpdateAbilityTest extends TestCase
         $this->captureUpdates($updates);
         Functions\when('wp_revisions_enabled')->justReturn(false);
         $log = Mockery::mock(ChangeLog::class);
-        $log->expects('record')
-            ->with('lit/content-update', 'page', '5', Mockery::type('string'), 811, null, 'partial')
+        $log->expects('recordPartial')
+            ->with('lit/content-update', 'page', '5', Mockery::type('string'), 811)
             ->andReturn(12);
 
         $failure = $this->executeExpectingFailure($writer, $input, $log);
diff --git a/tests/Unit/Integrations/WordPress/Status/PostReplaceWithCopyAbilityTest.php b/tests/Unit/Integrations/WordPress/Status/PostReplaceWithCopyAbilityTest.php
index 044a969..a6bc78c 100644
--- a/tests/Unit/Integrations/WordPress/Status/PostReplaceWithCopyAbilityTest.php
+++ b/tests/Unit/Integrations/WordPress/Status/PostReplaceWithCopyAbilityTest.php
@@ -228,8 +228,8 @@ final class PostReplaceWithCopyAbilityTest extends TestCase
         $cloner->expects('restore')->with($this->original, self::SNAPSHOT, PostCloner::PARTS)->andThrow(new RuntimeException('Restore incomplete: terms'));
         Functions\expect('wp_trash_post')->never();
         $log = Mockery::mock(ChangeLog::class);
-        $log->expects('record')
-            ->with('lit/post-replace-with-copy', 'page', '5', Mockery::type('string'), 900, null, 'partial')
+        $log->expects('recordPartial')
+            ->with('lit/post-replace-with-copy', 'page', '5', Mockery::type('string'), 900)
             ->andReturn(12);
 
         try {