diff --git a/database/migrations/2021_03_04_095453_add_foreign_keys.php b/database/migrations/2021_03_04_095453_add_foreign_keys.php
new file mode 100644
index 0000000..b8226e1
--- /dev/null
+++ b/database/migrations/2021_03_04_095453_add_foreign_keys.php
@@ -0,0 +1,104 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddForeignKeys extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('open_graph_scans', function (Blueprint $table) {
+            $table->bigInteger('website_id')->unsigned()->index()->change();
+            $table->foreign('website_id')->references('id')->on('websites')->onDelete('cascade');
+        });
+
+        Schema::table('robot_scans', function (Blueprint $table) {
+            $table->bigInteger('website_id')->unsigned()->index()->change();
+            $table->foreign('website_id')->references('id')->on('websites')->onDelete('cascade');
+        });
+
+        Schema::table('dns_scans', function (Blueprint $table) {
+            $table->bigInteger('website_id')->unsigned()->index()->change();
+            $table->foreign('website_id')->references('id')->on('websites')->onDelete('cascade');
+        });
+
+        Schema::table('visual_diffs', function (Blueprint $table) {
+            $table->bigInteger('website_id')->unsigned()->index()->change();
+            $table->foreign('website_id')->references('id')->on('websites')->onDelete('cascade');
+        });
+
+        Schema::table('cron_pings', function (Blueprint $table) {
+            $table->bigInteger('website_id')->unsigned()->index()->change();
+            $table->foreign('website_id')->references('id')->on('websites')->onDelete('cascade');
+        });
+
+        Schema::table('uptime_scans', function (Blueprint $table) {
+            $table->bigInteger('website_id')->unsigned()->index()->change();
+            $table->foreign('website_id')->references('id')->on('websites')->onDelete('cascade');
+        });
+
+        Schema::table('certificate_scans', function (Blueprint $table) {
+            $table->bigInteger('website_id')->unsigned()->index()->change();
+            $table->foreign('website_id')->references('id')->on('websites')->onDelete('cascade');
+        });
+
+        Schema::table('crawled_pages', function (Blueprint $table) {
+            $table->bigInteger('website_id')->unsigned()->index()->change();
+            $table->foreign('website_id')->references('id')->on('websites')->onDelete('cascade');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('open_graph_scans', function (Blueprint $table) {
+            $table->integer('website_id')->change();
+            $table->dropForeign('website_id');
+        });
+
+        Schema::table('robot_scans', function (Blueprint $table) {
+            $table->integer('website_id')->change();
+            $table->dropForeign('website_id');
+        });
+
+        Schema::table('dns_scans', function (Blueprint $table) {
+            $table->integer('website_id')->change();
+            $table->dropForeign('website_id');
+        });
+
+        Schema::table('visual_diffs', function (Blueprint $table) {
+            $table->integer('website_id')->change();
+            $table->dropForeign('website_id');
+        });
+
+        Schema::table('cron_pings', function (Blueprint $table) {
+            $table->integer('website_id')->change();
+            $table->dropForeign('website_id');
+        });
+
+        Schema::table('uptime_scans', function (Blueprint $table) {
+            $table->integer('website_id')->change();
+            $table->dropForeign('website_id');
+        });
+
+        Schema::table('certificate_scans', function (Blueprint $table) {
+            $table->integer('website_id')->change();
+            $table->dropForeign('website_id');
+        });
+
+        Schema::table('crawled_pages', function (Blueprint $table) {
+            $table->integer('website_id')->change();
+            $table->dropForeign('website_id');
+        });
+    }
+}