diff --git a/database/migrations/2020_05_16_165243_make_primary_key_on_metadata.php b/database/migrations/2020_05_16_165243_make_primary_key_on_metadata.php
new file mode 100644
index 0000000..a774065
--- /dev/null
+++ b/database/migrations/2020_05_16_165243_make_primary_key_on_metadata.php
@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class MakePrimaryKeyOnMetadata extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('metadata', function (Blueprint $table) {
+            $table->dropIndex(['url']);
+            $table->primary('url');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('metadata', function (Blueprint $table) {
+            $table->dropPrimary(['url']);
+            $table->index('url');
+        });
+    }
+}
diff --git a/database/migrations/2020_05_16_165705_add_unique_constraint_to_tags.php b/database/migrations/2020_05_16_165705_add_unique_constraint_to_tags.php
new file mode 100644
index 0000000..07f6d7e
--- /dev/null
+++ b/database/migrations/2020_05_16_165705_add_unique_constraint_to_tags.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddUniqueConstraintToTags extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('tags', function (Blueprint $table) {
+            $table->unique('name');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('tags', function (Blueprint $table) {
+            $table->dropUnique(['name']);
+        });
+    }
+}