fix(database): normalize OCI8 exception codes

- Classify OCI8 unique and retryable transaction errors from string codes
- Add coverage for OCI8 string-code exception classification

Signed-off-by: memleakd <121398829+memleakd@users.noreply.github.com>

Author: memleakd

system/Database/OCI8/Connection.php

@@ -120,15 +120,15 @@ class Connection extends BaseConnection
     protected function isUniqueConstraintViolation(int|string $code, string $message): bool
     {
         // ORA-00001: unique constraint violated.
-        return $code === 1;
+        return (int) $code === 1;
     }
 
     /**
      * Checks whether the native database code represents a retryable transaction failure.
      */
     protected function isRetryableTransactionErrorCode(int|string $code): bool
     {
-        return in_array($code, [60, 8177], true);
+        return in_array((int) $code, [60, 8177], true);
     }
 
     /**

tests/system/Database/RetryableTransactionExceptionTest.php

@@ -94,6 +94,12 @@ public static function provideCreatesUniqueConstraintViolationExceptions(): iter
                 1,
                 'Unique constraint violated.',
             ];
+
+            yield 'OCI8 unique constraint string code' => [
+                self::connection(OCI8Connection::class, 'OCI8'),
+                '1',
+                'Unique constraint violated.',
+            ];
         }
     }
 
@@ -128,7 +134,11 @@ public static function provideCreatesRetryableTransactionExceptions(): iterable
         if (defined('OCI_COMMIT_ON_SUCCESS')) {
             yield 'OCI8 deadlock' => [self::connection(OCI8Connection::class, 'OCI8'), 60];
 
+            yield 'OCI8 deadlock string code' => [self::connection(OCI8Connection::class, 'OCI8'), '60'];
+
             yield 'OCI8 serialization failure' => [self::connection(OCI8Connection::class, 'OCI8'), 8177];
+
+            yield 'OCI8 serialization failure string code' => [self::connection(OCI8Connection::class, 'OCI8'), '8177'];
         }
     }