Add unique constraint for analytics.

src/Entity/Analytics.php

@@ -10,6 +10,8 @@ use Doctrine\ORM\Mapping as ORM;
 /**
  * @ORM\Table(name="analytics", indexes={
  *   @ORM\Index(name="search_idx", columns={"type", "moment"})
+ * }, uniqueConstraints={
+ *   @ORM\UniqueConstraint(name="stats_unique_idx", columns={"station_id", "type", "moment"})
  * })
  * @ORM\Entity
  */

src/Entity/Migration/Version20201109203951.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Entity\Migration;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20201109203951 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add unique constraint for analytics.';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('CREATE UNIQUE INDEX stats_unique_idx ON analytics (station_id, type, moment)');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('DROP INDEX stats_unique_idx ON analytics');
+    }
+}