Add new index to users over deleted_at and location_id

database/migrations/2025_09_16_104604_create_users_deleted_at_location_id_index.php

@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            // We are doing 'deleted_at' *first* here because that way this index can do double-duty -
+            // handling queries for 'all undeleted users' as well as 'users who are deleted in this location'
+            // and 'users who are not-deleted in this location'
+            $table->index(['deleted_at','location_id']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->dropIndex(['deleted_at','location_id']);
+        });
+    }
+};