# Lumi Updates

Lumi updates are managed from **Admin > Updates**. The page separates Core and
Plugins into expandable sections and uses repository metadata to choose a safe
target before any files are changed.

## Version Policy

Core and plugin versions use `major.minor.patch`.

- Patch: fixes only.
- Minor: non-breaking features or design changes.
- Major: potentially incompatible changes.

The UI tracks three values separately: current version, latest available
version, and safe target version. Same-major updates can target the latest
version. Major crossings are blocked unless metadata exposes a compatibility
bridge, usually `X.0.0`, or another version marked with
`migration_kind: "compatibility_bridge"` and compatible with the current
install.

If the latest version is unsafe, the UI shows the safe target as the actionable
version and lists why the absolute latest is not selected.

Admins can also choose an exact core or plugin version. Installable releases
come from `release-index.json` and resolve to immutable `refs/tags/vX.Y.Z`
references. Lumi checks the version inside the selected tag before replacing
live code. Reinstalling the current version is supported as a repair action;
downgrades show an additional warning because preserved newer data is not
automatically migrated backward.

Updates to or from an unversioned install or target remain available so an admin
can recover directly from the repository. They are treated as manual repo
updates: the action button stays enabled, but the UI shows warnings and the
confirmation modal states that version ordering, changelog range, and rollback
safety cannot be verified from metadata.

## Metadata

The updater looks for these files on the source branch:

- `update-manifest.json` or `lumi.manifest.json`
- `release-index.json`
- `CHANGELOG.md` or `changelog.json`
- `plugins/<plugin_id>/plugin.json`
- `plugins/<plugin_id>/CHANGELOG.md` or `changelog.json`

Useful metadata fields include `version`, `channel`, `compatible_from`,
`migration_kind`, `migration_notes`, `rollback_safe`, `requirements`, `size`,
and changelog entries. Missing changelog data is shown as a warning.

Stable core releases keep `package.json`, `package-lock.json`,
`update-manifest.json`, and the matching `CHANGELOG.md` heading synchronized.
Changed plugins use their `plugin.json` version and a matching plugin
`CHANGELOG.md`; Lumi AI tools use `tool_info.json` and their own changelog.
`scripts/verify-release-metadata.js` checks those relationships, compatibility
metadata, and generated OKF version references before publication.
`scripts/verify-update-system.js` additionally checks the release catalog,
immutable refs, exact-version selection, preserved paths, dependency recovery,
and optional core/plugin boundaries.

Stable checks read `main` by default. The newest `experimental-*` branch is used
only when explicitly selected on the updates page.

## Production Branch Switching

**Admin > Updates > Running code branch** lists the exact remote `main` and
`experimental-*` branches with their commits. Deploying one uses the same
managed repository, snapshot, protected-data, verification, recovery-marker,
and restart path as core updates even when the branch has the same semantic
version as the running code. Bundled plugin code is switched with core code;
plugin data and local-only plugins remain preserved.

Returning to `main` through this control preserves the live database and is the
normal rollback path for an experiment. Emergency snapshot restore remains
available, but it restores the database captured before deployment and can
therefore discard later database writes. See
[Safe production branch deployments](branch-deployments.md) for the operating
procedure and migration-safety requirements.

## Snapshots And Revert

Before a core, plugin, repo, or ZIP update, Lumi creates a snapshot under
`data/snapshots/` and records metadata in the snapshot index:

- target kind/id
- from/to versions
- source branch
- update method
- rollback safety
- recovery marker id
- major-crossing flag
- compressed storage size

For plugin updates, Lumi leaves the plugin's `data` directory in its existing
location and transactionally replaces only code files. This allows running
Windows services and network shares to retain open AI model/runtime handles
without blocking the update or its automatic rollback.

New snapshots contain only the replaceable rollback payload: compressed core or
plugin code and a compressed SQLite database backup. Preserved local data is
not duplicated into snapshots. In particular, LLM model files, managed AI
runtimes, caches, uploads, logs, plugin data, exports, secrets, and community
knowledge stay in their live preserved locations.

Snapshot cleanup runs during startup, before a new snapshot, when the Updates
page reads the snapshot list, and after an administrator changes the cleanup
policy. **Admin > Updates > Snapshots** controls both limits:

- maximum snapshot age, 30 days by default;
- latest snapshots per target, 5 by default, applied independently to core and
  each plugin.

A snapshot is removed when either limit is exceeded. Retained legacy core
snapshots are compacted automatically: when a valid compressed core archive is
present, the redundant raw `full/` copy is deleted, and old raw database copies
are converted to `database.zip`. This also removes model copies left by the
earlier snapshot layout without deleting the live models.

Manual revert is available for core and individual plugins. Revert actions are
limited to the previous-version snapshot for that target. Major-version rollback
is blocked unless the snapshot or manifest explicitly marks rollback as safe.

If a repository or ZIP update fails after file replacement begins, Lumi
automatically attempts to restore the snapshot. The failed recovery marker and
backup are retained when automatic restore cannot finish, so safe mode can show
the actionable error instead of silently deleting the recovery copy.

## Preserved Local Data

Core updates, ZIP updates, plugin updates, and restores leave these local areas
in place:

- `data/`, including the database, feedback files, AI models/runtimes, tool
  settings, caches, and local exports;
- plugin-owned `data/` directories;
- `knowledge/community/` and `knowledge/corrections/`;
- files under generated knowledge folders unless they explicitly declare both
  `generated: true` and `editable: false`;
- local configuration, storage, uploads, logs, secrets, environment files, and
  the plugin directory during core-only updates.

Full core updates remove stale replaceable code before copying the new version.
Plugin code is prepared in a staging directory and swapped only after the new
files are ready; plugin data is moved into the replacement as part of that
transaction.

Core updates intentionally do not copy or delete the `plugins/` directory.
Core code therefore accesses optional plugin capabilities through the registered
framework API instead of importing files from a plugin directory. Plugins can
be installed or changed independently from their version picker.

## Runtime Dependencies

Start Lumi through `run.js` (the `npm start` command does this). Before starting
the application, the wrapper compares direct runtime packages with
`package-lock.json`. Missing or mismatched required packages are repaired with a
locked production install. This covers dependencies added by a core update even
though `node_modules/` is preserved during file replacement.

Optional integrations, including `obs-websocket-js`, are loaded defensively. A
failed optional install is recorded and the rest of Lumi starts normally; the
affected connector reports that it is unavailable. Required dependency failure
opens recovery mode instead of repeatedly starting a partially installed core.

## ZIP Fallback

Core and plugin ZIP updates remain available, but they are hidden under
**Manual ZIP updates**. ZIP updates create snapshots and recovery
markers. They may bypass repo metadata and compatibility checks unless the ZIP
contains valid manifest data, so use them as a manual fallback.

## Progress Events

Admin update actions publish Server-Sent Events through
`GET /admin/updates/events`. Event names include `update:checking`,
`update:metadata`, `update:snapshot`, `update:recovery_marker`,
`update:download`, `update:apply`, `update:verify`, `update:complete`,
`update:failed`, and `update:revert`.

Core and plugin update success returns a five-second in-page notice before the
service restarts. The current document remains available, reports reconnect
attempts, and refreshes the Updates workspace in place once Lumi responds again.
Repository checks and cleanup-policy saves also reconcile without document
navigation.
Submit buttons inherit the endpoint and method from their parent form unless
they explicitly declare `formaction` or `formmethod`; this prevents browsers'
current-page fallback values from redirecting an update away from its apply
route.

Plugin failures are shown directly beside the affected plugin instead of only
changing the action button label. The error identifies the failed stage:
repository metadata, selected repository version, recovery preparation,
rollback snapshot, file replacement, or installed-plugin verification. The
same stage and error are persisted in `data/update-state.json`; a later success
clears the stale failure.

When a problem occurs only on production, the optional **Admin > Diagnostics**
page can expose the redacted `update_state`, `system_health`, and
`recent_errors` checks to a trusted maintainer without shell or write access.
See [Production diagnostics](production-diagnostics.md).
