diff --git a/migrations/Version20260221000300.php b/migrations/Version20260221000300.php
index 5bf5d61..45bce37 100644
--- a/migrations/Version20260221000300.php
+++ b/migrations/Version20260221000300.php
@@ -17,7 +17,7 @@ final class Version20260221000300 extends AbstractMigration
     public function up(Schema $schema): void
     {
         $this->addSql("
-            CREATE TABLE tag_rebuild_job (
+            CREATE TABLE IF NOT EXISTS tag_rebuild_job (
                 id BINARY(16) NOT NULL,
                 status VARCHAR(16) NOT NULL,
                 created_at DATETIME NOT NULL,
diff --git a/migrations/Version20260225000200.php b/migrations/Version20260225000200.php
index 3ef1800..1fd3056 100644
--- a/migrations/Version20260225000200.php
+++ b/migrations/Version20260225000200.php
@@ -17,19 +17,51 @@ final class Version20260225000200 extends AbstractMigration
     public function up(Schema $schema): void
     {
         $this->addSql('ALTER TABLE knowledge_tag CHANGE description description LONGTEXT DEFAULT NULL');
-        $this->addSql('ALTER TABLE knowledge_tag RENAME INDEX uniq_knowledge_tag_slug TO UNIQ_86B46255989D9B62');
+
+        if ($this->indexExists('knowledge_tag', 'uniq_knowledge_tag_slug')) {
+            $this->addSql(
+                'ALTER TABLE knowledge_tag RENAME INDEX uniq_knowledge_tag_slug TO UNIQ_86B46255989D9B62'
+            );
+        }
 
         $this->addSql('ALTER TABLE document DROP FOREIGN KEY FK_D8698A769407EE77');
         $this->addSql('ALTER TABLE document ADD CONSTRAINT FK_D8698A769407EE77 FOREIGN KEY (current_version_id) REFERENCES document_version (id)');
 
         $this->addSql('ALTER TABLE tag_rebuild_job CHANGE error_message error_message LONGTEXT DEFAULT NULL');
 
-        $this->addSql('ALTER TABLE document_tag RENAME INDEX idx_document_tag_document TO IDX_D0234567C33F7837');
-        $this->addSql('ALTER TABLE document_tag RENAME INDEX idx_document_tag_tag TO IDX_D0234567BAD26311');
+        if ($this->indexExists('document_tag', 'idx_document_tag_document')) {
+            $this->addSql(
+                'ALTER TABLE document_tag RENAME INDEX idx_document_tag_document TO IDX_D0234567C33F7837'
+            );
+        }
+
+        if ($this->indexExists('document_tag', 'idx_document_tag_tag')) {
+            $this->addSql(
+                'ALTER TABLE document_tag RENAME INDEX idx_document_tag_tag TO IDX_D0234567BAD26311'
+            );
+        }
+    }
+
+    private function indexExists(string $table, string $index): bool
+    {
+        $count = (int) $this->connection->fetchOne(
+            <<<SQL
+            SELECT COUNT(*)
+            FROM INFORMATION_SCHEMA.STATISTICS
+            WHERE TABLE_SCHEMA = DATABASE()
+              AND TABLE_NAME = :table
+              AND INDEX_NAME = :index
+            SQL,
+            [
+                'table' => $table,
+                'index' => $index,
+            ]
+        );
+
+        return $count > 0;
     }
 
     public function down(Schema $schema): void
     {
-        // Optional – in Drift-Fix-Migration meist nicht notwendig
     }
 }
\ No newline at end of file