⚡️ Improve speed in location based station lookup (#3255)

Author: HerrLevin

Diff for: database/migrations/2025_03_04_111312_add_latitude_longitude_index_to_train_stations.php

@@ -0,0 +1,20 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void {
+        Schema::table('train_stations', function(Blueprint $table) {
+            $table->index(['latitude', 'longitude']);
+        });
+    }
+
+    public function down(): void {
+        Schema::table('train_stations', function(Blueprint $table) {
+            $table->dropIndex(['latitude', 'longitude']);
+        });
+    }
+};