feat: add many playlist for music

database/migrations/2026_05_31_120000_create_music_playlist_pivot_table.php

@@ -0,0 +1,53 @@
+<?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
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('music_playlist', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('music_id')->constrained('music')->cascadeOnDelete();
+            $table->foreignId('playlist_id')->constrained('music_playlists')->cascadeOnDelete();
+            $table->integer('order')->default(0);
+            $table->timestamps();
+
+            $table->unique(['music_id', 'playlist_id']);
+        });
+
+        // Backfill the pivot from the existing single playlist_id column.
+        if (Schema::hasColumn('music', 'playlist_id')) {
+            DB::table('music')
+                ->whereNotNull('playlist_id')
+                ->orderBy('id')
+                ->select('id', 'playlist_id', 'order')
+                ->chunk(200, function ($rows) {
+                    $now = now();
+                    $insert = $rows->map(fn ($row) => [
+                        'music_id' => $row->id,
+                        'playlist_id' => $row->playlist_id,
+                        'order' => $row->order ?? 0,
+                        'created_at' => $now,
+                        'updated_at' => $now,
+                    ])->all();
+
+                    DB::table('music_playlist')->insertOrIgnore($insert);
+                });
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('music_playlist');
+    }
+};

database/migrations/2026_05_31_120100_drop_playlist_columns_from_music_table.php

@@ -0,0 +1,32 @@
+<?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('music', function (Blueprint $table) {
+            $table->dropForeign(['playlist_id']);
+            $table->dropColumn('playlist_id');
+            $table->dropColumn('order');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('music', function (Blueprint $table) {
+            $table->foreignId('playlist_id')->nullable()->after('type')
+                ->constrained('music_playlists')->nullOnDelete();
+            $table->integer('order')->default(0)->after('duration');
+        });
+    }
+};