What's changing: PowerSync Service promotes the MongoDB bucket storage format previously tracked as experimental "storage version 3" to a new stable "storage version 4," now that the remaining changes to it (from #764 and #770) have merged. Storage version 3 itself is not removed yet. Postgres storage is not affected; this applies to MongoDB bucket storage only.
High priority — existing docs are now inaccurate or incomplete
- Sync Config Compatibility (
sync/advanced/compatibility.mdx → https://docs.powersync.com/sync/advanced/compatibility), "Optional config.storage_version" section: the example's inline comment reads "version 2 (stable) and 3 (unstable) are currently supported." This list is now incomplete. Version 4 (stable) is also supported.
For reviewer consideration — worth documenting
- New stable
storage_version: 4 value, an additional option for config.storage_version alongside the already-documented 2 and 3, in the same "Optional config.storage_version" section. Self-hosted operators pinning a specific storage version now have a newer stable option to choose from.
Source PR: powersync-ja/powersync-service#776. Merged 2026-08-31.
Filed automatically by Claude Code (claude-sonnet-5). A human must verify the scope, prepare the docs PR, and publish it only once this update has been released.
What's changing: PowerSync Service promotes the MongoDB bucket storage format previously tracked as experimental "storage version 3" to a new stable "storage version 4," now that the remaining changes to it (from #764 and #770) have merged. Storage version 3 itself is not removed yet. Postgres storage is not affected; this applies to MongoDB bucket storage only.
High priority — existing docs are now inaccurate or incomplete
sync/advanced/compatibility.mdx→ https://docs.powersync.com/sync/advanced/compatibility), "Optionalconfig.storage_version" section: the example's inline comment reads "version 2 (stable) and 3 (unstable) are currently supported." This list is now incomplete. Version 4 (stable) is also supported.For reviewer consideration — worth documenting
storage_version: 4value, an additional option forconfig.storage_versionalongside the already-documented2and3, in the same "Optionalconfig.storage_version" section. Self-hosted operators pinning a specific storage version now have a newer stable option to choose from.Source PR: powersync-ja/powersync-service#776. Merged 2026-08-31.
Filed automatically by Claude Code (
claude-sonnet-5). A human must verify the scope, prepare the docs PR, and publish it only once this update has been released.