Fix duplicate download entries and add constraint

database/migrations/2025_09_21_215923_add_unique_constraint_to_downloads_table.php

@@ -0,0 +1,54 @@
+<?php
+
+use App\Models\Downloads;
+
+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
+    {
+        # Delete entries with "#" as URL
+        Downloads::where('url', '#')->forceDelete();
+
+        # Remove duplicate entries
+        $duplicates = DB::table('downloads')
+            ->select('episode_id', 'type', DB::raw('COUNT(*) as count'))
+            ->groupBy('episode_id', 'type')
+            ->having('count', '>', 1)
+            ->get();
+
+        foreach ($duplicates as $duplicate) {
+            // Find all rows for this episode_id and type
+            $rows = DB::table('downloads')
+                ->where('episode_id', $duplicate->episode_id)
+                ->where('type', $duplicate->type)
+                ->orderBy('count', 'desc')  // Order by count to delete the ones with the lower count
+                ->get();
+
+            // Delete the rows with lower counts, keeping the one with the highest count
+            $rows->skip(1)->each(function ($row) {
+                DB::table('downloads')->where('id', $row->id)->delete();
+            });
+        }
+
+        Schema::table('downloads', function (Blueprint $table) {
+            $table->unique(['episode_id', 'type']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('downloads', function (Blueprint $table) {
+            $table->dropUnique(['episode_id', 'type']);
+        });
+    }
+};