fix: resolve PHPStan error and update unit test for non-primary VAR_ID

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: abnegate

src/Database/Validator/Sequence.php

@@ -57,8 +57,7 @@ public function isValid($value): bool
             case Database::VAR_UUID7:
                 return \is_string($value) && preg_match('/^[a-f0-9]{8}-[a-f0-9]{4}-7[a-f0-9]{3}-[89ab][a-f0-9]{3}-[a-f0-9]{12}$/i', $value) === 1;
             case Database::VAR_INTEGER:
-                $start = ($this->primary) ? 1 : 0;
-                $validator = new Range($start, Database::MAX_BIG_INT, Database::VAR_INTEGER);
+                $validator = new Range(1, Database::MAX_BIG_INT, Database::VAR_INTEGER);
                 return $validator->isValid($value);
 
             default: