Two variants of the same defect: an admin took away access and the running
system kept granting it.
Deactivating or deleting a user only stopped the *next* login. `login`
checks the active flag, but `require_auth` maps token -> id without
re-reading the row, so an already-open session kept working over a pool
whose key was still in RAM. There was no way to stop one user either: the
per-user cron, hub and MCP loops all observed the *instance* shutdown
token. They now take a per-user child token stored on UserContext, and
Skald::revoke_user_runtime tears a single user down in a load-bearing
order — revoke every session, evict and cancel the context, then lock the
database, so nothing is left querying a pool we are about to close.
Revoking a security group had a durable version of the same problem. The
group is validated when selected and then persisted on
chat_sessions.run_context, which was replayed verbatim on every later
load — so a group removed from a role stayed in force on sessions that
already had it, across restarts. get_or_create_handler now runs the stored
value through run_context::reconcile_group_for_user, making it advisory:
every load re-checks it, whether or not anyone announced the change.
The degrade target is the role's default group, never None: a context with
no group resolves to the catch-all `default`, whose rules are the fallback
tier under every other group, so clearing widens rather than narrows. The
reconcile touches only security_group, so a project session's server-built
project_root and system_prompt survive a permissions edit, and it leaves
the stored group alone when the role cannot be resolved — guessing on a
transient error could only widen. role_default_run_context moves into the
core seam so the group a session starts on and the group it falls back to
cannot drift apart.
Both fixes run synchronously in their handlers. Only the container half of
deactivation rides the bus, as the new UserActiveChanged event: a lossy
64-slot broadcast whose contract is "settles at the next login" is the
wrong transport for taking access away.
Tests: revoke_user drops all of one user's sessions and nobody else's, and
is a no-op when nothing is live; the reconcile degrades a revoked group to
the role default, keeps an allowed one, preserves project fields in both
directions, never touches an admin, and stays put when the role is
unresolvable.
Not exercised at runtime: no Docker/live-server run, so the end-to-end
paths (deactivating a logged-in user, editing a role with sessions open)
are covered by unit tests only.
Two changes developed together in one session; they share the same module
structure (db/mod.rs, the core lib root) and only compile together, so they
land as one commit.
## UserManager + per-user encryption (§9/§11)
New `users::UserManager`: owns the system.db pool plus a map
`userid -> SqlitePool` of unlocked databases. The pool *is* the unlock token —
its connect options carry the DEK as SQLCipher's raw key, so an open pool means
the key is in RAM until restart and dropping it re-locks (§9). Knows nothing
about cookies.
New `crypto` module: envelope encryption. A random 256-bit DEK encrypts
`{userid}.db`; `users.database_password` holds it sealed with AES-256-GCM under
`Argon2id(password, salt)`. The AEAD tag is the password verifier — one
derivation both authenticates and yields the key, so encrypted users store no
second hash. Cleartext users store the Argon2id output directly, compared in
constant time. Argon2 runs in spawn_blocking behind a 2-permit semaphore
(256 MiB per derivation).
- SQLCipher via `libsqlite3-sys` `bundled-sqlcipher-vendored-openssl`, pinned
<0.38 so it unifies with the one sqlx-sqlite links (a newer copy would apply
the feature to a SQLite sqlx never uses). OpenSSL is vendored and static, so
the binary stays self-contained.
- Schema split into `create_registry_tables` (instance-wide, no user key) and
`create_owner_tables` (one owner's content, identical in every file). No FK in
the owner bucket may reach the registry — enforced by a standalone test.
Dropped `chat_history.model_db_id` (write-only, and the only registry-crossing
key); moved `projects`/`project_tickets` into the owner bucket.
- Provisioning invariant: the file is written before the row, deleted after it,
so a crash leaves an orphan file, never a user without a database. `open_db`
never creates: a missing file is an error, not a silent empty database.
Not consumed yet: no login, call sites still use the shared system.db pool.
## Extract crates/skald-core
The headless core moves out of `src/` into its own crate; `skald` (server) and
the coming `skald-setup` are shells around it. Two dependencies on the shell
were inverted rather than dragged along, so the core names neither Tauri nor any
concrete plugin:
- `Plugin::tools(self: Arc<Self>)` — plugins contribute tools through this hook
(sibling of `http_router`), so the core no longer downcasts to
`MobileConnectorPlugin`.
- `tools::restart::set_restart_handler` — the desktop shell installs its
teardown-and-respawn; the core defaults to the supervisor exit code. The core
loses its `desktop` feature.
- `boot`'s stdout formatter moves to the binary (`src/boot_format.rs`); the core
only emits tracing events.
All 79 core tests pass; the binary boots and serves in a clean directory, and
the mobile-connector tools still register through the new hook.
dguiducci