Various fixes for DB seeding

database/seeders/UnitSeeder.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Database\Seeders;
+
+use App\Models\Unit;
+use Illuminate\Database\Seeder;
+
+class UnitSeeder extends Seeder
+{
+    public function run(): void
+    {
+        Unit::create(['name' => 'Stück',    'symbol' => 'Stk']);
+        Unit::create(['name' => 'Stunden',  'symbol' => 'h']);
+        Unit::create(['name' => 'Tage',     'symbol' => 'd']);
+        Unit::create(['name' => 'pauschal', 'symbol' => 'p']);
+    }
+}