Add optional version_label to sync configs

[rkistner]

With a single replication stream being able to handle multiple sync configs, the current diagnostic tooling does not distinguish between the sync configs properly. For example, the PowerSync Cloud dashboard only shows replication stream names, with no identifier for sync configs.

An additional issue is that it can be difficult to correlate what is deployed with what is active or processing, without comparing the full contents.

This adds a new config field sync_config.version_label in the main config YAML. When sync config is updated, that label is persisted with the config. If only the label itself is updated, that is also treated as a sync config change.

The main purpose of this field is to track sync config versions when using automated tooling, such as the powersync cloud environment. It can be managed manually, but there is no check to enforce that it is updated or unique.

Note that the version_label is not part of the sync config file itself, but rather the root config, to simplify management by of the value by tooling, while the user writes the actual sync config file.

The behavior of label change triggering a sync config change can be used instead of the old "add comment/whitespace in sync config" recommendation to reload the config.

For Postgres storage, this requires adding a new column in a migration. On MongoDB storage, it is a new field, but no migration required.

AI Usage

Used Codex gpt-5.6 to implement.

[changeset-bot]

🦋 Changeset detected

Latest commit: e8e135c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 15 packages

Name	Type
@powersync/service-module-postgres-storage	Minor
@powersync/service-module-mongodb-storage	Minor
@powersync/service-core	Minor
@powersync/service-types	Minor
@powersync/service-schema	Minor
@powersync/service-module-convex	Patch
@powersync/service-module-mongodb	Patch
@powersync/service-module-mssql	Patch
@powersync/service-module-mysql	Patch
@powersync/service-module-postgres	Patch
@powersync/service-image	Minor
@powersync/service-module-core	Patch
test-client	Patch
@powersync/service-client	Patch
@powersync/lib-service-postgres	Patch

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