Revert "Release 1.6.1"

This reverts commit adbcaa7.

Author: patapenka-alexey

CHANGELOG.md

@@ -12,15 +12,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
-### Removed
-
-# [1.6.1] - 2025-10-20
-
-This release introduces fix of the `box.schema.needs_upgrade` metric.
+- Use `box.schema.needs_upgrade` instead of `box.schema_needs_upgrade` (#529)
 
-### Fixed
-
-- Use `box.schema.needs_upgrade` instead of `box.schema_needs_upgrade` (#529).
+### Removed
 
 # [1.6.0] - 2025-10-14