close #752 Fixed: Dublicate image problem for media directory.

database/migrations/2019_02_04_000000_modify_deleted_at_column_media_table.php

@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+class ModifyDeletedAtColumnMediaTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('media', function (Blueprint $table) {
+            $table->dropUnique(['disk', 'directory', 'filename', 'extension']);
+
+            $table->unique(['disk', 'directory', 'filename', 'extension', 'deleted_at']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('media', function (Blueprint $table) {
+            $table->dropUnique(['disk', 'directory', 'filename', 'extension', 'deleted_at']);
+
+            $table->unique(['disk', 'directory', 'filename', 'extension']);
+        });
+    }
+}