diff --git a/src/Entity/Attachments/AttachmentType.php b/src/Entity/Attachments/AttachmentType.php
index ac7991f1..38934cfb 100644
--- a/src/Entity/Attachments/AttachmentType.php
+++ b/src/Entity/Attachments/AttachmentType.php
@@ -85,7 +85,7 @@ class AttachmentType extends StructuralDBElement
 
     /**
      * @var string
-     * @ORM\Column(type="string", length=65535)
+     * @ORM\Column(type="text")
      */
     protected $filetype_filter;
 
diff --git a/src/Entity/Base/TimestampTrait.php b/src/Entity/Base/TimestampTrait.php
index e989a45b..0f57840c 100644
--- a/src/Entity/Base/TimestampTrait.php
+++ b/src/Entity/Base/TimestampTrait.php
@@ -42,14 +42,14 @@ trait TimestampTrait
 {
     /**
      * @var \DateTime The date when this element was modified the last time.
-     * @ORM\Column(type="datetimetz", name="last_modified")
+     * @ORM\Column(type="datetime", name="last_modified", options={"default"="CURRENT_TIMESTAMP"})
      * @Groups({"extended", "full"})
      */
     protected $lastModified;
 
     /**
      * @var \DateTime The date when this element was created.
-     * @ORM\Column(type="datetimetz", name="datetime_added")
+     * @ORM\Column(type="datetime", name="datetime_added", options={"default"="CURRENT_TIMESTAMP"})
      * @Groups({"extended", "full"})
      */
     protected $addedDate;
diff --git a/src/Entity/Parts/Footprint.php b/src/Entity/Parts/Footprint.php
index e9e385d0..00bceac3 100644
--- a/src/Entity/Parts/Footprint.php
+++ b/src/Entity/Parts/Footprint.php
@@ -85,7 +85,7 @@ class Footprint extends PartsContainingDBElement
 
     /**
      * @var string
-     * @ORM\Column(type="string", length=65536)
+     * @ORM\Column(type="text")
      */
     protected $filename;
 
@@ -96,7 +96,7 @@ class Footprint extends PartsContainingDBElement
 
     /**
      * @var string
-     * @ORM\Column(type="string", length=65536)
+     * @ORM\Column(type="text")
      */
     protected $filename_3d;
 
diff --git a/src/Entity/Parts/Part.php b/src/Entity/Parts/Part.php
index e31ae63a..d15af90b 100644
--- a/src/Entity/Parts/Part.php
+++ b/src/Entity/Parts/Part.php
@@ -148,14 +148,14 @@ class Part extends AttachmentContainingDBElement
 
     /**
      *  @ColumnSecurity(type="datetime")
-     *  @ORM\Column(type="datetimetz", name="datetime_added")
+     * @ORM\Column(type="datetime", name="datetime_added", options={"default"="CURRENT_TIMESTAMP"})
      */
     protected $addedDate;
 
     /**
      * @var \DateTime The date when this element was modified the last time.
-     * @ORM\Column(type="datetimetz", name="last_modified")
      * @ColumnSecurity(type="datetime")
+     * @ORM\Column(type="datetime", name="last_modified", options={"default"="CURRENT_TIMESTAMP"})
      */
     protected $lastModified;
 
diff --git a/src/Entity/Parts/PartLot.php b/src/Entity/Parts/PartLot.php
index 5ade5bc5..ef173a2d 100644
--- a/src/Entity/Parts/PartLot.php
+++ b/src/Entity/Parts/PartLot.php
@@ -66,7 +66,7 @@ class PartLot extends DBElement
     /**
      * @var ?\DateTime Set a time until when the lot must be used.
      * Set to null, if the lot can be used indefinitley.
-     * @ORM\Column(type="datetimetz", name="expiration_date", nullable=true)
+     * @ORM\Column(type="datetime", name="expiration_date", nullable=true)
      */
     protected $expiration_date;
 
diff --git a/src/Migrations/Version20190902130102.php b/src/Migrations/Version20190902130102.php
new file mode 100644
index 00000000..ef25996b
--- /dev/null
+++ b/src/Migrations/Version20190902130102.php
@@ -0,0 +1,89 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20190902130102 extends AbstractMigration
+{
+    public function getDescription() : string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema) : void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'mysql', 'Migration can only be executed safely on \'mysql\'.');
+
+        $this->addSql('ALTER TABLE attachments DROP FOREIGN KEY FK_212B82DC1F1F2A24');
+        $this->addSql('ALTER TABLE attachments DROP FOREIGN KEY attachements_type_id_fk');
+        $this->addSql('ALTER TABLE attachments CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('DROP INDEX idx_212b82dcc54c8c93 ON attachments');
+        $this->addSql('CREATE INDEX IDX_47C4FAD6C54C8C93 ON attachments (type_id)');
+        $this->addSql('DROP INDEX idx_212b82dc1f1f2a24 ON attachments');
+        $this->addSql('CREATE INDEX IDX_47C4FAD61F1F2A24 ON attachments (element_id)');
+        $this->addSql('ALTER TABLE attachments ADD CONSTRAINT FK_212B82DC1F1F2A24 FOREIGN KEY (element_id) REFERENCES parts (id)');
+        $this->addSql('ALTER TABLE attachments ADD CONSTRAINT attachements_type_id_fk FOREIGN KEY (type_id) REFERENCES attachment_types (id)');
+        $this->addSql('ALTER TABLE attachment_types DROP FOREIGN KEY attachement_types_parent_id_fk');
+        $this->addSql('ALTER TABLE attachment_types CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('DROP INDEX idx_9a8c1c77727aca70 ON attachment_types');
+        $this->addSql('CREATE INDEX IDX_EFAED719727ACA70 ON attachment_types (parent_id)');
+        $this->addSql('ALTER TABLE attachment_types ADD CONSTRAINT attachement_types_parent_id_fk FOREIGN KEY (parent_id) REFERENCES attachment_types (id)');
+        $this->addSql('ALTER TABLE devices CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE categories CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE footprints CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE manufacturers CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE measurement_units CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE parts CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE part_lots CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE storelocations CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE suppliers CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE currencies CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE orderdetails CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE pricedetails CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE groups CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+        $this->addSql('ALTER TABLE users CHANGE datetime_added datetime_added DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL, CHANGE last_modified last_modified DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL');
+    }
+
+    public function down(Schema $schema) : void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'mysql', 'Migration can only be executed safely on \'mysql\'.');
+
+        $this->addSql('ALTER TABLE `attachment_types` DROP FOREIGN KEY FK_EFAED719727ACA70');
+        $this->addSql('ALTER TABLE `attachment_types` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('DROP INDEX idx_efaed719727aca70 ON `attachment_types`');
+        $this->addSql('CREATE INDEX IDX_9A8C1C77727ACA70 ON `attachment_types` (parent_id)');
+        $this->addSql('ALTER TABLE `attachment_types` ADD CONSTRAINT FK_EFAED719727ACA70 FOREIGN KEY (parent_id) REFERENCES `attachment_types` (id)');
+        $this->addSql('ALTER TABLE `attachments` DROP FOREIGN KEY FK_47C4FAD6C54C8C93');
+        $this->addSql('ALTER TABLE `attachments` DROP FOREIGN KEY FK_47C4FAD61F1F2A24');
+        $this->addSql('ALTER TABLE `attachments` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('DROP INDEX idx_47c4fad6c54c8c93 ON `attachments`');
+        $this->addSql('CREATE INDEX IDX_212B82DCC54C8C93 ON `attachments` (type_id)');
+        $this->addSql('DROP INDEX idx_47c4fad61f1f2a24 ON `attachments`');
+        $this->addSql('CREATE INDEX IDX_212B82DC1F1F2A24 ON `attachments` (element_id)');
+        $this->addSql('ALTER TABLE `attachments` ADD CONSTRAINT FK_47C4FAD6C54C8C93 FOREIGN KEY (type_id) REFERENCES `attachment_types` (id)');
+        $this->addSql('ALTER TABLE `attachments` ADD CONSTRAINT FK_47C4FAD61F1F2A24 FOREIGN KEY (element_id) REFERENCES `parts` (id)');
+        $this->addSql('ALTER TABLE `categories` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE currencies CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `devices` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `footprints` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `groups` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `manufacturers` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `measurement_units` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `orderdetails` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE part_lots CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `parts` CHANGE datetime_added datetime_added DATETIME NOT NULL, CHANGE last_modified last_modified DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `pricedetails` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `storelocations` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `suppliers` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+        $this->addSql('ALTER TABLE `users` CHANGE last_modified last_modified DATETIME NOT NULL, CHANGE datetime_added datetime_added DATETIME NOT NULL');
+    }
+}