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+# 0.9.0 — Accounts, Sessions, Auto-Restart, SMTP, Audit-Retention — Design
+
+**Date:** 2026-06-14 · **Branch:** `feat/v1-foundation` · **Status:** approved (build all, then release 0.9.0)
+
+Operator-approved scope + decisions:
+- **Multi-User:** additional accounts are **all equal admins** (no RBAC). The audit log already records
+  the actor, so "who did what" is covered.
+- **Sessions:** active-session list + **per-user** and **global** "log out everywhere", remember-token
+  rotation. Requires switching the session store to the database (see §2).
+- **Auto-Restart:** a **restart sentinel** — the app writes a request file, a host-side watcher
+  restarts the stack. No Docker socket in the container.
+- **Settings extras:** **SMTP configuration** + **Audit-log retention** (no theme, no API tokens now).
+
+Foundational refactor (enables clean parallel work + scalable Settings):
+
+## §0. Settings → per-tab nested Livewire components
+`Settings\Index` currently inlines Profil + Sicherheit in one big Blade with a `$tab` switch. Refactor
+the tab bodies into **nested full components** so each area is isolated, testable, and independently
+ownable:
+- `Settings\Profile` (name/email/password — lift the existing profile + password forms out of Index).
+- `Settings\Security` (the 2FA/TOTP card + recovery modal trigger + `<livewire:settings.webauthn-keys/>`).
+- New `Settings\Users`, `Settings\Sessions`, `Settings\Email` (§3/§2/§4).
+`Settings\Index` keeps only: the identity header, the `#[Url] $tab` tab nav (now: Profil · Sicherheit
+· Benutzer · Sitzungen · E-Mail), and `@if($tab===…) <livewire:settings.x/> @endif`. The `tabs` array
+gains the new keys + icons (`user-plus`, a sessions icon, `mail`). Each nested component owns its own
+state/validation/audit — no more one-giant-class.
+
+## §1. Auto-restart sentinel
+Goal: replace the manual `docker compose -f docker-compose.prod.yml restart` notice with a one-click,
+self-applying restart — without giving the container the Docker socket.
+- **App:** `DeploymentService::requestRestart()` writes a sentinel file to a path on a **bind-mounted
+  shared volume** the host watches, e.g. `storage/app/restart.request` mapped to a host dir (or a
+  dedicated `./run/restart.request`). `restartRequested(): bool` checks it exists.
+- **Host watcher (installed once by `install.sh`/documented):** a tiny script + **systemd path unit**
+  (`clusev-restart.path` → `clusev-restart.service`) that, when the sentinel appears, runs
+  `docker compose -f docker-compose.prod.yml restart` (or `up -d`) in the project dir and deletes the
+  sentinel. Ship the unit files + script under `docker/restart-sentinel/` + wire `install.sh`.
+- **UI:** the "Neustart erforderlich" block loses the raw command; instead a button **"Jetzt neu
+  starten"** → `requestRestart()` → shows "Neustart wird ausgeführt …". If the host watcher isn't
+  installed (sentinel lingers > N s), fall back to a muted "falls nichts passiert: `… restart` auf dem
+  Host" hint. Domain/TLS/mode saves call `requestRestart()` automatically per operator confirm.
+- Files: `app/Services/DeploymentService.php` (+ maybe `RestartService`), `docker/restart-sentinel/*`,
+  `install.sh`, `docker-compose.prod.yml` (the shared sentinel volume), the System view, lang/system.
+
+## §2. Database sessions + session management
+- **Switch the session store to the database** so sessions are per-row + enumerable. Add the standard
+  Laravel `sessions` table migration (id, user_id, ip_address, user_agent, payload, last_activity).
+  Set `SESSION_DRIVER=database` in `.env`/`.env.example`/compose. **One-time effect:** existing Redis
+  sessions are dropped → everyone re-logs-in once (documented in the changelog + the restart notice).
+  Redis stays the cache/queue store. Register `Illuminate\Session\Middleware\AuthenticateSession` so
+  password changes invalidate other sessions.
+- **`Settings\Sessions` component:** lists the current user's active sessions from the `sessions` table
+  (this device flagged; ip, user-agent summarized, last activity relative). Actions:
+  - **"Andere Geräte abmelden"** (self): delete the user's other session rows + `Auth::logoutOtherDevices`
+    pattern (rotate so other sessions die), keep the current one.
+  - **(Admin) "Diesen Account überall abmelden"** per listed user (in `Settings\Users`): delete all that
+    user's session rows + rotate their `remember_token`.
+  - **(Admin) "Alle abmelden (global)"**: truncate `sessions` + rotate every user's `remember_token`
+    (logs everyone out incl. self). Confirm via wire-elements/modal (R5), audited.
+- Files: migration, `app/Livewire/Settings/Sessions.php` + view, `app/Services/SessionService.php`
+  (the delete/rotate logic, testable), `bootstrap/app.php` (AuthenticateSession), `.env*`/compose,
+  `lang/{de,en}/settings.php`.
+
+## §3. Multi-user accounts (all equal admins)
+- **`Settings\Users` component:** lists all users (name, email, 2FA badge, last login if available);
+  **create** (name, email unique, a generated temp password shown once + `must_change_password=true`
+  so the new admin rotates on first login); **remove** (R5 modal; cannot remove yourself or the last
+  remaining user). Each action audited (`user.create` / `user.delete`, actor = current). Per-row
+  **"überall abmelden"** (→ §2). All created users are full admins (no role column needed now).
+- New-user password: generate a strong temp password, show once in a modal (like recovery codes), do
+  NOT email it unless SMTP configured (then offer "Zugangsdaten per E-Mail senden").
+- Files: `app/Livewire/Settings/Users.php` + view, maybe `app/Livewire/Modals/CreateUser.php` for the
+  temp-password reveal, `lang/{de,en}/settings.php`. The `User` factory/model already suffices.
+
+## §4. SMTP configuration
+- **`Settings\Email` component:** form for host, port, username, password (encrypted Setting),
+  encryption (none/tls/ssl), from-address, from-name. Persist as `Setting` keys (`mail_*`); the password
+  via an encrypted Setting. **Apply at runtime** by overriding `config(['mail.*' => …])` in
+  `AppServiceProvider::boot()` when the settings exist (mirrors the existing reverb override). A
+  **"Testmail senden"** button sends a test to the current user + surfaces success/failure. When SMTP is
+  unset, the app stays on the `log` mailer (current behaviour) and forgot-password keeps the 2FA/CLI path.
+- Files: `app/Livewire/Settings/Email.php` + view, `app/Providers/AppServiceProvider.php` (runtime mail
+  override), `lang/{de,en}/settings.php`. Password stored encrypted; never rendered back (show a "set"
+  placeholder).
+
+## §5. Audit-log retention
+- **Setting `audit_retention_days`** (0/empty = keep forever; default keep-forever). A control in the
+  Audit page header (or a small Settings block) to set it. A scheduled command **`clusev:prune-audit`**
+  deletes `audit_events older than N days`; register it on the scheduler (daily). Audited that a prune
+  ran (count). Files: `app/Console/Commands/PruneAudit.php`, the scheduler (routes/console.php or
+  Kernel), a control in `audit/index` or `Settings`, `lang`.
+
+## Security invariants
+- New accounts are created by an authenticated admin only; temp password is `must_change_password`.
+- Global logout / per-user logout rotate `remember_token` so stolen cookies die.
+- SMTP password stored encrypted (APP_KEY), never rendered, never logged.
+- The restart sentinel grants NO new container privilege (no Docker socket); the host watcher is the
+  only thing that can restart, scoped to the project dir.
+- Cannot delete yourself or the last admin (no lock-out).
+- All destructive actions: wire-elements/modal confirm (R5) + AuditEvent.
+
+## Testing (per feature, TDD)
+- Settings refactor: each nested component renders + its tab loads; Index hosts them by `$tab`.
+- Sentinel: `requestRestart()` writes the file, `restartRequested()` reads it; UI button calls it.
+- Sessions: list reflects `sessions` rows; per-user logout deletes that user's rows + rotates token;
+  global logout truncates + rotates all; self "other devices" keeps current.
+- Users: create makes a `must_change_password` admin + audits; cannot delete self/last; remove audits.
+- Email: settings persist (password encrypted), runtime override applies, test-send path.
+- Retention: prune deletes only old rows, keeps recent; command is scheduled.
+- Full suite green, Pint, Codex clean, R12 (DE+EN, 3 breakpoints), then bump + tag **v0.9.0**.
+
+## Out of scope (later)
+- RBAC/roles, API tokens, theme preference, per-event audit export, email templates beyond the test.