diff --git a/.env b/.env
index b8b2f78..4d48e91 100644
--- a/.env
+++ b/.env
@@ -24,5 +24,5 @@ APP_SECRET=927b6476c39dc61a41e55ee144b865f2
 #
 # DATABASE_URL="sqlite:///%kernel.project_dir%/var/data.db"
 # DATABASE_URL="mysql://db_user:db_password@127.0.0.1:3306/db_name?serverVersion=5.7&charset=utf8mb4"
-DATABASE_URL="sqlite:///%kernel.project_dir%/var/app.db"
+DATABASE_URL="sqlite:///%kernel.project_dir%/var/app2.db"
 ###< doctrine/doctrine-bundle ###
diff --git a/migrations/Version20220524145844.php b/migrations/Version20220524145844.php
deleted file mode 100644
index 93e1b17..0000000
--- a/migrations/Version20220524145844.php
+++ /dev/null
@@ -1,65 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace DoctrineMigrations;
-
-use Doctrine\DBAL\Schema\Schema;
-use Doctrine\Migrations\AbstractMigration;
-
-/**
- * Auto-generated Migration: Please modify to your needs!
- */
-final class Version20220524145844 extends AbstractMigration
-{
-    public function getDescription(): string
-    {
-        return '';
-    }
-
-    public function up(Schema $schema): void
-    {
-        // this up() migration is auto-generated, please modify it to your needs
-        $this->addSql('DROP INDEX IDX_CA4C3EB8ED5CA9E6');
-        $this->addSql('CREATE TEMPORARY TABLE __temp__mer_be_sub AS SELECT id, service_id, code, status, sub_date, unsub_date FROM mer_be_sub');
-        $this->addSql('DROP TABLE mer_be_sub');
-        $this->addSql('CREATE TABLE mer_be_sub (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, service_id INTEGER NOT NULL, code VARCHAR(255) DEFAULT NULL, status INTEGER NOT NULL, sub_date DATETIME NOT NULL --(DC2Type:datetime_immutable)
-        , unsub_date DATETIME DEFAULT NULL --(DC2Type:datetime_immutable)
-        , CONSTRAINT FK_CA4C3EB8ED5CA9E6 FOREIGN KEY (service_id) REFERENCES mer_service (id) NOT DEFERRABLE INITIALLY IMMEDIATE)');
-        $this->addSql('INSERT INTO mer_be_sub (id, service_id, code, status, sub_date, unsub_date) SELECT id, service_id, code, status, sub_date, unsub_date FROM __temp__mer_be_sub');
-        $this->addSql('DROP TABLE __temp__mer_be_sub');
-        $this->addSql('CREATE INDEX IDX_CA4C3EB8ED5CA9E6 ON mer_be_sub (service_id)');
-        $this->addSql('DROP INDEX IDX_E4F82A3DED5CA9E6');
-        $this->addSql('CREATE TEMPORARY TABLE __temp__mer_para_sub AS SELECT id, service_id, pin, status, sub_date, unsub_date FROM mer_para_sub');
-        $this->addSql('DROP TABLE mer_para_sub');
-        $this->addSql('CREATE TABLE mer_para_sub (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, service_id INTEGER NOT NULL, pin INTEGER DEFAULT NULL, status INTEGER NOT NULL, sub_date DATETIME NOT NULL --(DC2Type:datetime_immutable)
-        , unsub_date DATETIME DEFAULT NULL --(DC2Type:datetime_immutable)
-        , CONSTRAINT FK_E4F82A3DED5CA9E6 FOREIGN KEY (service_id) REFERENCES mer_service (id) NOT DEFERRABLE INITIALLY IMMEDIATE)');
-        $this->addSql('INSERT INTO mer_para_sub (id, service_id, pin, status, sub_date, unsub_date) SELECT id, service_id, pin, status, sub_date, unsub_date FROM __temp__mer_para_sub');
-        $this->addSql('DROP TABLE __temp__mer_para_sub');
-        $this->addSql('CREATE INDEX IDX_E4F82A3DED5CA9E6 ON mer_para_sub (service_id)');
-    }
-
-    public function down(Schema $schema): void
-    {
-        // this down() migration is auto-generated, please modify it to your needs
-        $this->addSql('DROP INDEX IDX_CA4C3EB8ED5CA9E6');
-        $this->addSql('CREATE TEMPORARY TABLE __temp__mer_be_sub AS SELECT id, service_id, code, status, sub_date, unsub_date FROM mer_be_sub');
-        $this->addSql('DROP TABLE mer_be_sub');
-        $this->addSql('CREATE TABLE mer_be_sub (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, service_id INTEGER NOT NULL, code VARCHAR(255) DEFAULT NULL, status INTEGER NOT NULL, sub_date DATETIME NOT NULL --(DC2Type:datetime_immutable)
-        , unsub_date DATETIME DEFAULT NULL --(DC2Type:datetime_immutable)
-        )');
-        $this->addSql('INSERT INTO mer_be_sub (id, service_id, code, status, sub_date, unsub_date) SELECT id, service_id, code, status, sub_date, unsub_date FROM __temp__mer_be_sub');
-        $this->addSql('DROP TABLE __temp__mer_be_sub');
-        $this->addSql('CREATE INDEX IDX_CA4C3EB8ED5CA9E6 ON mer_be_sub (service_id)');
-        $this->addSql('DROP INDEX IDX_E4F82A3DED5CA9E6');
-        $this->addSql('CREATE TEMPORARY TABLE __temp__mer_para_sub AS SELECT id, service_id, pin, status, sub_date, unsub_date FROM mer_para_sub');
-        $this->addSql('DROP TABLE mer_para_sub');
-        $this->addSql('CREATE TABLE mer_para_sub (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, service_id INTEGER NOT NULL, pin INTEGER DEFAULT NULL, status INTEGER NOT NULL, sub_date DATETIME NOT NULL --(DC2Type:datetime_immutable)
-        , unsub_date DATETIME DEFAULT NULL --(DC2Type:datetime_immutable)
-        )');
-        $this->addSql('INSERT INTO mer_para_sub (id, service_id, pin, status, sub_date, unsub_date) SELECT id, service_id, pin, status, sub_date, unsub_date FROM __temp__mer_para_sub');
-        $this->addSql('DROP TABLE __temp__mer_para_sub');
-        $this->addSql('CREATE INDEX IDX_E4F82A3DED5CA9E6 ON mer_para_sub (service_id)');
-    }
-}
diff --git a/migrations/Version20220524145056.php b/migrations/Version20220524155905.php
similarity index 80%
rename from migrations/Version20220524145056.php
rename to migrations/Version20220524155905.php
index ada21a5..4d0f647 100644
--- a/migrations/Version20220524145056.php
+++ b/migrations/Version20220524155905.php
@@ -10,7 +10,7 @@ use Doctrine\Migrations\AbstractMigration;
 /**
  * Auto-generated Migration: Please modify to your needs!
  */
-final class Version20220524145056 extends AbstractMigration
+final class Version20220524155905 extends AbstractMigration
 {
     public function getDescription(): string
     {
@@ -25,15 +25,16 @@ final class Version20220524145056 extends AbstractMigration
         , unsub_date DATETIME DEFAULT NULL --(DC2Type:datetime_immutable)
         )');
         $this->addSql('CREATE INDEX IDX_CA4C3EB8ED5CA9E6 ON mer_be_sub (service_id)');
-        $this->addSql('CREATE TABLE mer_dm (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, offer_id INTEGER NOT NULL)');
-        $this->addSql('CREATE TABLE mer_dt (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, service_id VARCHAR(255) NOT NULL)');
+        $this->addSql('CREATE TABLE mer_dm (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, ott_id INTEGER DEFAULT NULL, offer_id INTEGER NOT NULL)');
+        $this->addSql('CREATE UNIQUE INDEX UNIQ_C03EF7C6396F71CA ON mer_dm (ott_id)');
+        $this->addSql('CREATE TABLE mer_dt (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, ott_id INTEGER DEFAULT NULL, service_id VARCHAR(255) NOT NULL)');
+        $this->addSql('CREATE UNIQUE INDEX UNIQ_A4555F06396F71CA ON mer_dt (ott_id)');
         $this->addSql('CREATE TABLE mer_para_sub (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, service_id INTEGER NOT NULL, pin INTEGER DEFAULT NULL, status INTEGER NOT NULL, sub_date DATETIME NOT NULL --(DC2Type:datetime_immutable)
         , unsub_date DATETIME DEFAULT NULL --(DC2Type:datetime_immutable)
         )');
         $this->addSql('CREATE INDEX IDX_E4F82A3DED5CA9E6 ON mer_para_sub (service_id)');
-        $this->addSql('CREATE TABLE mer_service (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, platform_id INTEGER NOT NULL, mcc_mnc INTEGER DEFAULT NULL, metadata CLOB DEFAULT NULL --(DC2Type:json)
+        $this->addSql('CREATE TABLE mer_service (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, mcc_mnc INTEGER DEFAULT NULL, metadata CLOB DEFAULT NULL --(DC2Type:json)
         , discr VARCHAR(255) NOT NULL, product_code VARCHAR(255) DEFAULT NULL, api_key VARCHAR(255) DEFAULT NULL, activation_code VARCHAR(255) DEFAULT NULL)');
-        $this->addSql('CREATE INDEX IDX_E9ABEA72FFE6496F ON mer_service (platform_id)');
     }
 
     public function down(Schema $schema): void
diff --git a/src/DataFixtures/MerFixtures.php b/src/DataFixtures/MerFixtures.php
index e7cb6f7..d5ca638 100644
--- a/src/DataFixtures/MerFixtures.php
+++ b/src/DataFixtures/MerFixtures.php
@@ -19,27 +19,27 @@ class MerFixtures extends Fixture
     {
         $ser1 = new MerParaDM();
         $ser1->setMccMnc(12345)
-            ->setPlatform((new MerDM())->setOfferId(221))
+            ->setPlatform((new MerDM())->setOfferId(221)->setPlatform($ser1))
             ->setProductCode('code1');
 
         $ser2 = new MerParaDM();
         $ser2->setMccMnc(12345)
-            ->setPlatform((new MerDM())->setOfferId(223))
+            ->setPlatform((new MerDM())->setOfferId(223)->setPlatform($ser2))
             ->setProductCode('code2');
 
         $ser3 = new MerParaDT();
         $ser3->setMccMnc(12345)
-            ->setPlatform((new MerDT())->setServiceId('ser-vi-ce1'))
+            ->setPlatform((new MerDT())->setServiceId('ser-vi-ce1')->setPlatform($ser3))
             ->setApiKey('api1');
 
         $ser4 = new MerParaDT();
         $ser4->setMccMnc(12341)
-            ->setPlatform((new MerDT())->setServiceId('ser-vi-ce2'))
+            ->setPlatform((new MerDT())->setServiceId('ser-vi-ce2')->setPlatform($ser4))
             ->setApiKey('api2');
 
         $ser5 = new MerBeDM();
         $ser5->setMccMnc(12341)
-            ->setPlatform((new MerDM())->setOfferId(112))
+            ->setPlatform((new MerDM())->setOfferId(112)->setPlatform($ser5))
             ->setActivationCode('active1');
 
         $sub1 = new MerParaSub();
diff --git a/src/Entity/MerBeDM.php b/src/Entity/MerBeDM.php
index 41d273a..c746f0d 100644
--- a/src/Entity/MerBeDM.php
+++ b/src/Entity/MerBeDM.php
@@ -6,7 +6,7 @@ use App\Repository\MerBeDMRepository;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\Entity(repositoryClass: MerBeDMRepository::class)]
-class MerBeDM extends MerService
+class MerBeDM extends MerService implements OttInterface
 {
 //    #[ORM\Id]
 //    #[ORM\GeneratedValue]
@@ -16,10 +16,6 @@ class MerBeDM extends MerService
     #[ORM\Column(type: 'string', length: 255)]
     private $activation_code;
 
-    #[ORM\OneToOne(targetEntity: MerDM::class, cascade: ['persist'])]
-    #[ORM\JoinColumn(nullable: false)]
-    private MerDM $platform;
-
 //    public function getId(): ?int
 //    {
 //        return $this->id;
@@ -36,16 +32,4 @@ class MerBeDM extends MerService
 
         return $this;
     }
-
-    public function getPlatform(): ?MerDM
-    {
-        return $this->platform;
-    }
-
-    public function setPlatform(?MerDM $platform): self
-    {
-        $this->platform = $platform;
-
-        return $this;
-    }
 }
diff --git a/src/Entity/MerDM.php b/src/Entity/MerDM.php
index 6d48778..be9d540 100644
--- a/src/Entity/MerDM.php
+++ b/src/Entity/MerDM.php
@@ -6,7 +6,7 @@ use App\Repository\MerDMRepository;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\Entity(repositoryClass: MerDMRepository::class)]
-class MerDM
+class MerDM extends Platform
 {
     #[ORM\Id]
     #[ORM\GeneratedValue]
diff --git a/src/Entity/MerDT.php b/src/Entity/MerDT.php
index 8430ed3..f2fb7f7 100644
--- a/src/Entity/MerDT.php
+++ b/src/Entity/MerDT.php
@@ -6,7 +6,7 @@ use App\Repository\MerDTRepository;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\Entity(repositoryClass: MerDTRepository::class)]
-class MerDT
+class MerDT extends Platform
 {
     #[ORM\Id]
     #[ORM\GeneratedValue]
diff --git a/src/Entity/MerParaDM.php b/src/Entity/MerParaDM.php
index dc44db9..9648293 100644
--- a/src/Entity/MerParaDM.php
+++ b/src/Entity/MerParaDM.php
@@ -6,7 +6,7 @@ use App\Repository\MerParaDMRepository;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\Entity(repositoryClass: MerParaDMRepository::class)]
-class MerParaDM extends MerService
+class MerParaDM extends MerService implements OttInterface
 {
 //    #[ORM\Id]
 //    #[ORM\GeneratedValue]
@@ -16,10 +16,6 @@ class MerParaDM extends MerService
     #[ORM\Column(type: 'string', length: 255)]
     private $product_code;
 
-    #[ORM\OneToOne(targetEntity: MerDM::class, cascade: ['persist'])]
-    #[ORM\JoinColumn(nullable: false)]
-    private MerDM $platform;
-
 //    public function getId(): ?int
 //    {
 //        return $this->id;
@@ -36,16 +32,4 @@ class MerParaDM extends MerService
 
         return $this;
     }
-
-    public function getPlatform(): ?MerDM
-    {
-        return $this->platform;
-    }
-
-    public function setPlatform(?MerDM $platform): self
-    {
-        $this->platform = $platform;
-
-        return $this;
-    }
 }
diff --git a/src/Entity/MerParaDT.php b/src/Entity/MerParaDT.php
index c362089..1487df4 100644
--- a/src/Entity/MerParaDT.php
+++ b/src/Entity/MerParaDT.php
@@ -6,7 +6,7 @@ use App\Repository\MerParaDTRepository;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\Entity(repositoryClass: MerParaDTRepository::class)]
-class MerParaDT extends MerService
+class MerParaDT extends MerService implements OttInterface
 {
 //    #[ORM\Id]
 //    #[ORM\GeneratedValue]
@@ -16,10 +16,6 @@ class MerParaDT extends MerService
     #[ORM\Column(type: 'string', length: 255)]
     private $api_key;
 
-    #[ORM\OneToOne(targetEntity: MerDT::class, cascade: ['persist'])]
-    #[ORM\JoinColumn(nullable: false)]
-    private MerDT $platform;
-
 //    public function getId(): ?int
 //    {
 //        return $this->id;
@@ -36,16 +32,4 @@ class MerParaDT extends MerService
 
         return $this;
     }
-
-    public function getPlatform(): ?MerDT
-    {
-        return $this->platform;
-    }
-
-    public function setPlatform(?MerDT $platform): self
-    {
-        $this->platform = $platform;
-
-        return $this;
-    }
 }
diff --git a/src/Entity/MerService.php b/src/Entity/MerService.php
index 9386ea4..eea2e9b 100644
--- a/src/Entity/MerService.php
+++ b/src/Entity/MerService.php
@@ -3,6 +3,7 @@
 namespace App\Entity;
 
 use App\Repository\MerServiceRepository;
+use Doctrine\DBAL\Platforms\OraclePlatform;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\InheritanceType('SINGLE_TABLE')]
@@ -26,6 +27,9 @@ abstract class MerService
     #[ORM\Column(type: 'json', nullable: true)]
     private $metadata = [];
 
+    #[ORM\OneToOne(targetEntity: Platform::class, cascade: ['persist'], mappedBy: 'ott')]
+    private Platform $platform;
+
     public function getId(): ?int
     {
         return $this->id;
@@ -54,4 +58,16 @@ abstract class MerService
 
         return $this;
     }
+
+    public function getPlatform(): ?Platform
+    {
+        return $this->platform;
+    }
+
+    public function setPlatform(?Platform $platform): self
+    {
+        $this->platform = $platform;
+
+        return $this;
+    }
 }
diff --git a/src/Entity/OttInterface.php b/src/Entity/OttInterface.php
new file mode 100644
index 0000000..cae4cbc
--- /dev/null
+++ b/src/Entity/OttInterface.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace App\Entity;
+
+interface OttInterface
+{
+
+}
\ No newline at end of file
diff --git a/src/Entity/Platform.php b/src/Entity/Platform.php
new file mode 100644
index 0000000..6472da1
--- /dev/null
+++ b/src/Entity/Platform.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\MappedSuperclass]
+class Platform
+{
+    #[ORM\OneToOne(targetEntity: "MerService", inversedBy: "platform")]
+    #[ORM\JoinColumn(name: "ott_id", referencedColumnName: "id")]
+    private ?MerService $ott;
+
+    public function getOtt(): ?MerService
+    {
+        return $this->ott;
+    }
+
+    public function setPlatform(?MerService $ott): self
+    {
+        $this->ott = $ott;
+
+        return $this;
+    }
+}
\ No newline at end of file