Add a unique constraint on paddock names

composer.json

@@ -13,7 +13,8 @@
         "fruitcake/laravel-cors": "^1.0",
         "guzzlehttp/guzzle": "^6.3",
         "laravel/framework": "^7.0",
-        "laravel/tinker": "^2.0"
+        "laravel/tinker": "^2.0",
+        "doctrine/dbal": "^2.10"
     },
     "require-dev": {
         "facade/ignition": "^2.0",

database/migrations/2020_04_17_080631_add_unique_constraint_on_paddock_names.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddUniqueConstraintOnPaddockNames extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('paddocks', function (Blueprint $table) {
+            $table->string('name')->unique()->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('paddocks', function (Blueprint $table) {
+            $table->dropUnique('name');
+        });
+    }
+}