diff --git a/db/migrations/20210315235815_create_values.php b/db/migrations/20210315235815_create_values.php
index 02d4c21..b99ad28 100644
--- a/db/migrations/20210315235815_create_values.php
+++ b/db/migrations/20210315235815_create_values.php
@@ -34,13 +34,21 @@ class CreateValues extends Phinx\Migration\AbstractMigration
                 'signed' => false,
                 'after' => 'value',
             ])
-            ->addIndex(['currency_id'], [
+            /*->addIndex(['currency_id'], [
                 'name' => 'currency_id',
                 'unique' => false,
             ])
             ->addIndex(['base_id'], [
                 'name' => 'base_id',
                 'unique' => false,
+            ])*/
+            ->addForeignKey(['currency_id'], 'currencies', ['id'], [
+              'delete' => 'CASCADE',
+              'update' => 'CASCADE'
+            ])
+            ->addForeignKey(['base_id'], 'currencies', ['id'], [
+              'delete' => 'CASCADE',
+              'update' => 'CASCADE'
             ])
             ->create();
         /*$this->table('currencies', [
diff --git a/db/migrations/20210320020631_create_sources.php b/db/migrations/20210320020631_create_sources.php
index 2b77479..64167be 100644
--- a/db/migrations/20210320020631_create_sources.php
+++ b/db/migrations/20210320020631_create_sources.php
@@ -53,9 +53,13 @@ final class CreateSources extends AbstractMigration
           'encoding' => 'utf8mb4',
           'after' => 'url',
       ])
-      ->addIndex(['currency_id'], [
+      /*->addIndex(['currency_id'], [
           'name' => 'currency_id',
           'unique' => false,
+      ])*/
+      ->addForeignKey(['currency_id'], 'currencies', ['id'], [
+        'delete' => 'CASCADE',
+        'update' => 'CASCADE'
       ])
       ->create();
     }
diff --git a/db/migrations/20210414015145_create_aliases.php b/db/migrations/20210414015145_create_aliases.php
new file mode 100644
index 0000000..95572b7
--- /dev/null
+++ b/db/migrations/20210414015145_create_aliases.php
@@ -0,0 +1,59 @@
+<?php
+declare(strict_types=1);
+
+use Phinx\Migration\AbstractMigration;
+
+final class CreateAliases extends AbstractMigration
+{
+    /**
+     * Change Method.
+     *
+     * Write your reversible migrations using this method.
+     *
+     * More information on writing migrations is available here:
+     * https://book.cakephp.org/phinx/0/en/migrations.html#the-change-method
+     *
+     * Remember to call "create()" or "update()" and NOT "save()" when working
+     * with the Table class.
+     */
+    public function change(): void
+    {
+      $this->table('aliases', [
+        'id' => false,
+        'primary_key' => ['id'],
+        'engine' => 'InnoDB',
+        'encoding' => 'utf8mb4',
+        'collation' => 'utf8mb4_general_ci',
+        'comment' => '',
+        'row_format' => 'DYNAMIC',
+      ])
+      ->addColumn('id', 'integer', [
+          'null' => false,
+          'limit' => '10',
+          'signed' => false,
+          'identity' => 'enable',
+      ])
+      ->addColumn('currency_id', 'integer', [
+          'null' => false,
+          'limit' => '10',
+          'signed' => false,
+          'after' => 'id',
+      ])
+      ->addColumn('alias', 'string', [
+          'null' => false,
+          'limit' => 100,
+          'collation' => 'utf8mb4_general_ci',
+          'encoding' => 'utf8mb4',
+          'after' => 'currency_id',
+      ])
+      /*->addIndex(['currency_id'], [
+          'name' => 'currency_id',
+          'unique' => false,
+      ])*/
+      ->addForeignKey(['currency_id'], 'currencies', ['id'], [
+        'delete' => 'CASCADE',
+        'update' => 'CASCADE'
+      ])
+      ->create();
+    }
+}