added database driven system configurations with admin screen (#647)

src/Migrations/Version20190321181243.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace DoctrineMigrations;
+
+use App\Doctrine\AbstractMigration;
+use Doctrine\DBAL\Schema\Schema;
+
+/**
+ * Create the system configuration table.
+ *
+ * @version 0.9
+ */
+final class Version20190321181243 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        if ($this->isPlatformSqlite()) {
+            $this->addSql('CREATE TABLE kimai2_configuration (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, name VARCHAR(100) NOT NULL, value VARCHAR(255) DEFAULT NULL)');
+            $this->addSql('CREATE UNIQUE INDEX UNIQ_1C5D63D85E237E06 ON kimai2_configuration (name)');
+        } else {
+            $this->addSql('CREATE TABLE kimai2_configuration (id INT AUTO_INCREMENT NOT NULL, name VARCHAR(100) NOT NULL, value VARCHAR(255) DEFAULT NULL, UNIQUE INDEX UNIQ_1C5D63D85E237E06 (name), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci ENGINE = InnoDB');
+        }
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP TABLE kimai2_configuration');
+    }
+}