Add countries and regions

app/Models/Continent.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Continent extends Model
+{
+    protected $fillable = [
+        'code',
+        'name',
+        'internal_name',
+    ];
+
+    public function countries(): HasMany
+    {
+        return $this->hasMany(Country::class);
+    }
+
+    public function regions(): HasMany
+    {
+        return $this->hasMany(Region::class);
+    }
+}

database/migrations/2026_04_03_034848_create_continents_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('continents', function (Blueprint $table) {
+            $table->id();
+            $table->string('code', 2)->unique();
+            $table->string('name');
+            $table->string('internal_name');
+        });
+
+        DB::table('continents')->insert($this->continents());
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('continents');
+    }
+
+    private function continents(): array
+    {
+
+        return [
+            ['code' => 'AF', 'name' => 'Africa',        'internal_name' => 'africa',       ],
+            ['code' => 'AN', 'name' => 'Antarctica',    'internal_name' => 'antarctica',    ],
+            ['code' => 'AS', 'name' => 'Asia',          'internal_name' => 'asia',          ],
+            ['code' => 'EU', 'name' => 'Europe',        'internal_name' => 'europe',        ],
+            ['code' => 'NA', 'name' => 'North America', 'internal_name' => 'north_america', ],
+            ['code' => 'OC', 'name' => 'Oceania',       'internal_name' => 'oceania',       ],
+            ['code' => 'SA', 'name' => 'South America', 'internal_name' => 'south_america',],
+        ];
+    }
+};

database/migrations/2026_04_03_035028_add_continent_to_countries.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('countries', function (Blueprint $table) {
+            $table->foreignId('continent_id')->nullable()->constrained('continents');
+        });
+
+        // Resolve continent codes already in the table
+        $continentMap = DB::table('continents')->pluck('id', 'code')->all();
+
+        foreach ($continentMap as $code => $id) {
+            DB::table('countries')
+                ->where('continent', $code)
+                ->update(['continent_id' => $id]);
+        }
+
+        Schema::table('countries', function (Blueprint $table) {
+            $table->foreignId('continent_id')->nullable(false)->change();
+            $table->dropColumn('continent');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('countries', function (Blueprint $table) {
+            $table->string('continent', 2);
+        });
+
+        $continentMap = DB::table('continents')->pluck('code', 'id')->all();
+
+        foreach ($continentMap as $id => $code) {
+            DB::table('countries')
+                ->where('continent_id', $id)
+                ->update(['continent' => $code]);
+        }
+
+        Schema::table('countries', function (Blueprint $table) {
+            $table->dropConstrainedForeignId('continent_id');
+        });
+    }
+};

database/migrations/2026_04_03_035607_add_continent_to_regions.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        // Add the FK column first, nullable so we can populate it before constraining
+        Schema::table('regions', function (Blueprint $table) {
+            $table->foreignId('continent_id')->nullable()->constrained('continents');
+        });
+
+        // Resolve continent codes already in the table
+        $continentMap = DB::table('continents')->pluck('id', 'code')->all();
+
+        foreach ($continentMap as $code => $id) {
+            DB::table('regions')
+                ->where('continent', $code)
+                ->update(['continent_id' => $id]);
+        }
+
+        // Now make it non-nullable and drop the old string column
+        Schema::table('regions', function (Blueprint $table) {
+            $table->foreignId('continent_id')->nullable(false)->change();
+            $table->dropColumn('continent');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('regions', function (Blueprint $table) {
+            $table->string('continent', 2);
+        });
+
+        $continentMap = DB::table('continents')->pluck('code', 'id')->all();
+
+        foreach ($continentMap as $id => $code) {
+            DB::table('regions')
+                ->where('continent_id', $id)
+                ->update(['continent' => $code]);
+        }
+
+        Schema::table('regions', function (Blueprint $table) {
+            $table->dropConstrainedForeignId('continent_id');
+        });
+    }
+};