fix SQLSRV

Author: michalsn

system/Database/SQLSRV/Connection.php

@@ -555,7 +555,7 @@ private function isUniqueConstraintViolation(): bool
 
         foreach ($errors as $error) {
             // SQLSTATE 23000 (integrity constraint violation) with SQL Server error
-            // 2627 (primary key violation) or 2601 (unique index violation).
+            // 2627 (UNIQUE CONSTRAINT or PRIMARY KEY violation) or 2601 (UNIQUE INDEX violation).
             if (($error['SQLSTATE'] ?? '') === '23000'
                 && in_array($error['code'] ?? 0, [2627, 2601], true)) {
                 return true;

tests/system/Database/Live/UniqueConstraintViolationTest.php

@@ -70,7 +70,7 @@ public function testReturnsFalseAndErrorIsPopulatedWithDebugDisabled(): void
             'MySQLi'  => 1062,
             'Postgre' => '23505',
             'SQLite3' => 19,
-            'SQLSRV'  => '23000/2601',
+            'SQLSRV'  => '23000/2627',
             'OCI8'    => 1,
             default   => $this->fail('No expected error code defined for DB driver: ' . $this->db->DBDriver),
         };