feat: improved contingents api performance with db backed snapshots

migrations/Version20260820080235.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260820080235 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Adds the local contingent snapshot (contingent_day) and its sync bookkeeping (contingent_sync_state).';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('CREATE TABLE contingent_day (id INT AUTO_INCREMENT NOT NULL, accommodation_id INT NOT NULL, date DATE NOT NULL COMMENT \'(DC2Type:date_immutable)\', status VARCHAR(20) NOT NULL, INDEX IDX_8ACC3A068F3692CD (accommodation_id), UNIQUE INDEX uniq_contingent_day_accommodation_date (accommodation_id, date), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB');
+        $this->addSql('CREATE TABLE contingent_sync_state (id INT AUTO_INCREMENT NOT NULL, accommodation_id INT NOT NULL, content_hash VARCHAR(64) NOT NULL, changed_at DATETIME DEFAULT NULL COMMENT \'(DC2Type:datetime_immutable)\', synced_at DATETIME DEFAULT NULL COMMENT \'(DC2Type:datetime_immutable)\', horizon_to DATE DEFAULT NULL COMMENT \'(DC2Type:date_immutable)\', last_error LONGTEXT DEFAULT NULL, failure_count INT NOT NULL, UNIQUE INDEX UNIQ_737F167C8F3692CD (accommodation_id), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB');
+        $this->addSql('ALTER TABLE contingent_day ADD CONSTRAINT FK_8ACC3A068F3692CD FOREIGN KEY (accommodation_id) REFERENCES accommodation (id) ON DELETE CASCADE');
+        $this->addSql('ALTER TABLE contingent_sync_state ADD CONSTRAINT FK_737F167C8F3692CD FOREIGN KEY (accommodation_id) REFERENCES accommodation (id) ON DELETE CASCADE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE contingent_day DROP FOREIGN KEY FK_8ACC3A068F3692CD');
+        $this->addSql('ALTER TABLE contingent_sync_state DROP FOREIGN KEY FK_737F167C8F3692CD');
+        $this->addSql('DROP TABLE contingent_day');
+        $this->addSql('DROP TABLE contingent_sync_state');
+    }
+}