Cover endOfPeriod method of the Navigation class

The custom frequency requires a timezone configuration, forcing it
to run in the integration test scope.

Running the integration tests requires a database connection in the
build process. It enables other case tests.

The API Tests cause interference in other tests, requiring isolating
them.

app/Console/Commands/System/CreateDatabase.php

@@ -83,6 +83,7 @@ class CreateDatabase extends Command
             $pdo = new PDO($dsn, env('DB_USERNAME'), env('DB_PASSWORD'), $options);
         } catch (PDOException $e) {
             $this->friendlyError(sprintf('Error when connecting to DB: %s', $e->getMessage()));
+            return 1;
         }
 
         // only continue when no error.