fix: make user id nullable

database/migrations/2025_12_12_211441_make_user_id_nullable_in_reminders_table.php

@@ -0,0 +1,37 @@
+<?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('reminders', function (Blueprint $table) {
+                // First, drop the foreign key constraint
+            $table->dropForeign(['user_id']);
+            
+            // Make the column nullable
+            $table->foreignId('user_id')->nullable()->change();
+            
+            // Re-add the foreign key constraint with nullable
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('CASCADE');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('reminders', function (Blueprint $table) {
+            $table->dropForeign(['user_id']);
+            $table->foreignId('user_id')->change();
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('CASCADE');
+        });
+    }
+};