diff --git a/.github/linters/.sqlfluff b/.github/linters/.sqlfluff
new file mode 100644
index 0000000..75f73ae
--- /dev/null
+++ b/.github/linters/.sqlfluff
@@ -0,0 +1,2 @@
+[sqlfluff]
+dialect = mysql
diff --git a/.github/workflows/super-linter.yml b/.github/workflows/super-linter.yml
index df27749..e431d56 100644
--- a/.github/workflows/super-linter.yml
+++ b/.github/workflows/super-linter.yml
@@ -3,14 +3,7 @@
 name: Lint Code Base
 
 on:
-  push:
-    branches:
-      - main
-
   pull_request:
-    branches:
-      - main
-      - next
 
 jobs:
   run-lint:
@@ -27,3 +20,4 @@ jobs:
           VALIDATE_ALL_CODEBASE: false
           DEFAULT_BRANCH: "main"
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          VALIDATE_SQLFLUFF: false
diff --git a/db/rootfs/docker-entrypoint-initdb.d/001_mailserver.sql b/db/rootfs/docker-entrypoint-initdb.d/001_mailserver.sql
index 1b8018a..7fe874f 100644
--- a/db/rootfs/docker-entrypoint-initdb.d/001_mailserver.sql
+++ b/db/rootfs/docker-entrypoint-initdb.d/001_mailserver.sql
@@ -1,82 +1,62 @@
-/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
-/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
-/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
-/*!40101 SET NAMES utf8 */;
-/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
-/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
-/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
-
-
-# Export von Tabelle mail_aliases
-# ------------------------------------------------------------
+SET NAMES utf8mb4;
+SET FOREIGN_KEY_CHECKS = 0;
 
 DROP TABLE IF EXISTS `mail_aliases`;
-
 CREATE TABLE `mail_aliases` (
-  `id` int(11) NOT NULL AUTO_INCREMENT,
-  `domain_id` int(11) DEFAULT NULL,
-  `name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
-  `destination` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
-  PRIMARY KEY (`id`),
-  UNIQUE KEY `alias_idx` (`domain_id`,`name`,`destination`),
-  KEY `IDX_85AF3A56115F0EE5` (`domain_id`),
-  CONSTRAINT `FK_5F12BB39115F0EE5` FOREIGN KEY (`domain_id`) REFERENCES `mail_domains` (`id`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
-
-# Export von Tabelle mail_domains
-# ------------------------------------------------------------
+    `id` int(11) NOT NULL AUTO_INCREMENT,
+    `domain_id` int(11) DEFAULT NULL,
+    `name` varchar(255) NOT NULL,
+    `destination` varchar(255) NOT NULL,
+    PRIMARY KEY (`id`),
+    UNIQUE KEY `alias_idx` (`domain_id`, `name`, `destination`),
+    KEY `IDX_85AF3A56115F0EE5` (`domain_id`),
+    CONSTRAINT `FK_5F12BB39115F0EE5` FOREIGN KEY (
+        `domain_id`
+    ) REFERENCES `mail_domains` (`id`)
+) ENGINE = InnoDB;
 
 DROP TABLE IF EXISTS `mail_domains`;
-
 CREATE TABLE `mail_domains` (
-  `id` int(11) NOT NULL AUTO_INCREMENT,
-  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
-  PRIMARY KEY (`id`),
-  UNIQUE KEY `UNIQ_56C63EF25E237E06` (`name`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-
-# Export von Tabelle mail_users
-# ------------------------------------------------------------
+    `id` int(11) NOT NULL AUTO_INCREMENT,
+    `name` varchar(255) NOT NULL,
+    `dkim_enabled` tinyint(1) NOT NULL,
+    `dkim_selector` varchar(255) NOT NULL,
+    `dkim_private_key` longtext NOT NULL,
+    PRIMARY KEY (`id`),
+    UNIQUE KEY `UNIQ_56C63EF25E237E06` (`name`)
+) ENGINE = InnoDB;
 
 DROP TABLE IF EXISTS `mail_users`;
-
 CREATE TABLE `mail_users` (
-  `id` int(11) NOT NULL AUTO_INCREMENT,
-  `domain_id` int(11) DEFAULT NULL,
-  `name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
-  `password` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
-  PRIMARY KEY (`id`),
-  UNIQUE KEY `user_idx` (`name`,`domain_id`),
-  KEY `IDX_20400786115F0EE5` (`domain_id`),
-  CONSTRAINT `FK_1483A5E9115F0EE5` FOREIGN KEY (`domain_id`) REFERENCES `mail_domains` (`id`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
-
-# Export von Tabelle migration_versions
-# ------------------------------------------------------------
+    `id` int(11) NOT NULL AUTO_INCREMENT,
+    `domain_id` int(11) DEFAULT NULL,
+    `name` varchar(255) NOT NULL,
+    `password` varchar(255) NOT NULL,
+    `admin` tinyint(1) NOT NULL,
+    `enabled` tinyint(1) NOT NULL,
+    `send_only` tinyint(1) NOT NULL,
+    `quota` int(11) NOT NULL,
+    PRIMARY KEY (`id`),
+    UNIQUE KEY `user_idx` (`name`, `domain_id`),
+    KEY `IDX_20400786115F0EE5` (`domain_id`),
+    CONSTRAINT `FK_1483A5E9115F0EE5` FOREIGN KEY (
+        `domain_id`
+    ) REFERENCES `mail_domains` (`id`)
+) ENGINE = InnoDB;
 
 DROP TABLE IF EXISTS `migration_versions`;
-
 CREATE TABLE `migration_versions` (
-  `version` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
-  PRIMARY KEY (`version`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
-
-LOCK TABLES `migration_versions` WRITE;
-/*!40000 ALTER TABLE `migration_versions` DISABLE KEYS */;
-
-INSERT INTO `migration_versions` (`version`)
-VALUES
-	('20180320164351'),
-	('20180320171339');
-
-/*!40000 ALTER TABLE `migration_versions` ENABLE KEYS */;
-UNLOCK TABLES;
-
-
-
-/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
-/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
-/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
-/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
-/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
-/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
+    `version` varchar(191) NOT NULL,
+    `executed_at` DATETIME DEFAULT NULL,
+    `execution_time` int(11) DEFAULT NULL,
+    PRIMARY KEY (`version`)
+) ENGINE = InnoDB;
+
+INSERT INTO `migration_versions` (
+    `version`, `executed_at`, `execution_time`
+) VALUES
+('DoctrineMigrations\\Version20180320164351', NOW(), 0),
+('DoctrineMigrations\\Version20180320171339', NOW(), 0),
+('DoctrineMigrations\\Version20180322081734', NOW(), 0),
+('DoctrineMigrations\\Version20180520173959', NOW(), 0),
+('DoctrineMigrations\\Version20190610121554', NOW(), 0);