diff --git a/BACKLOG.md b/BACKLOG.md
index 22d6cf6..43689f4 100644
--- a/BACKLOG.md
+++ b/BACKLOG.md
@@ -26,3 +26,11 @@ New suggestion? → [Open an issue](https://github.com/ulsklyc/oikos/issues/new?
 | BL-10 | PWA: Offline fallback for critical pages | v0.4.0 |
 | - | UX Polish (animations, bottom sheet, FAB, stagger, vibration) | v0.2.0 |
 | - | Event listener leaks, CSS gaps, modal tests | v0.2.1 |
+| - | Internationalisation system (de + en), locale picker, formatDate/Time | v0.5.0 |
+| - | PWA: Correct Oikos icons (192/512/maskable/apple-touch), service worker v22 | v0.5.1 |
+| - | Calendar: Fix all-day RFC 5545 DTEND, DURATION support, birthday sync | v0.5.6 |
+| - | Calendar: RRULE expansion fix (strip RRULE: prefix), YEARLY support | v0.5.7 |
+| - | Italian (it) localization (497 keys) | v0.5.8 |
+| - | Security hardening: XSS, rate limiter bypass, OAuth CSRF, CSV injection, session invalidation | v0.5.9 |
+| - | Budget: Fix update failing when category changes | v0.6.0 |
+| - | Upgrade bcrypt 5 → 6, ESM migration, structured logger, remove SESSION_SECRET fallback | v0.7.0 |
diff --git a/CLAUDE.md.proposed b/CLAUDE.md.proposed
deleted file mode 100644
index 0aca331..0000000
--- a/CLAUDE.md.proposed
+++ /dev/null
@@ -1,50 +0,0 @@
-# Oikos
-
-Self-hosted family planner PWA. Node.js/Express, Vanilla JS (no build step), SQLite, Docker.
-
-## Hard Constraints
-
-Violations are always bugs - no exceptions.
-
-- Never add frontend frameworks (React, Vue, Svelte), bundlers (Webpack, Vite), or CSS libraries (Tailwind, Bootstrap).
-- No external frontend dependencies. Only allowed exception: Lucide Icons (`public/lucide.min.js`, self-hosted). No CDN links at runtime.
-- `import`/`export` everywhere. Never `require()`.
-- Never `eval()`. Never `innerHTML` with user data. Use `textContent` or DOM API.
-- All UI text via `t('key')`. Never hardcode strings in components. `de` is the reference locale.
-- Migrations append-only. Add entries to the `migrations` array in `server/db.js`. Never modify or reorder existing entries.
-- All colors, radii, shadows, font sizes from `public/styles/tokens.css`. Never hardcode design values.
-- Every route handler in `try/catch`. No unhandled promise rejections.
-
-## Architecture
-
-Request flow: client → Express static (`public/`) or `/api/v1/*` → session auth → route handler → better-sqlite3 (sync) → JSON.
-
-Key locations that are non-obvious:
-- `public/i18n.js` - `t()`, `formatDate()`, `formatTime()`, `SUPPORTED_LOCALES`
-- `public/api.js` - fetch wrapper (handles auth, CSRF, errors)
-- `public/router.js` - History API router (no library)
-
-## Conventions
-
-- API responses: `{ data: ... }` on success, `{ error: string, code: number }` on failure.
-- Dates/times: always `formatDate()`/`formatTime()` from `i18n.js`. Never format manually.
-- Pages (`public/pages/*.js`): export `render()`. No side effects on import.
-- Web Components (`public/components/*.js`): `oikos-` prefix, one component per file.
-- Tests: `test-[module].js` in project root, `--experimental-sqlite` flag. Add `test:[module]` script to `package.json`.
-
-## Verification
-
-```bash
-npm run dev    # Start with --watch
-npm test       # All test suites (requires Node ≥22)
-```
-
-## Reference
-
-| What | Where |
-|------|-------|
-| Data model, UI specs | `docs/SPEC.md` |
-| Design tokens | `public/styles/tokens.css` |
-| DB schema (source of truth) | `server/db.js` |
-| i18n keys | `public/locales/de.json` |
-| Code conventions, commit format | `CONTRIBUTING.md` |
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
index ab93c0b..b20a985 100644
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -45,8 +45,12 @@ an individual is officially representing the community in public spaces.
 ## Enforcement
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported to the community leaders responsible for enforcement. All complaints
-will be reviewed and investigated promptly and fairly.
+reported via [GitHub Private Vulnerability Reporting](https://github.com/ulsklyc/oikos/security/advisories/new)
+or by opening a private issue on GitHub. All complaints will be reviewed and
+investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
 
 ## Attribution
 
diff --git a/SECURITY.md b/SECURITY.md
index 2326b9f..a057ca2 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -29,12 +29,13 @@ Vulnerabilities that require physical access to the host or root on the server a
 
 - Session-based auth with `httpOnly`, `SameSite=Strict`, `Secure` cookies
 - CSRF protection via Double Submit Cookie on all state-changing requests
-- Passwords hashed with bcrypt (cost factor 12)
+- Passwords hashed with bcrypt v6 (cost factor 12)
 - Login rate limiting (5 attempts/min per IP)
 - API rate limiting (300 requests/min per IP)
 - Content Security Policy via Helmet (`self`-only)
 - Optional SQLCipher AES-256 database encryption
 - No API endpoint accessible without session auth (except login)
+- `SESSION_SECRET` is mandatory - server refuses to start if unset
 
 ## Authorization Model
 
diff --git a/docs/SPEC.md b/docs/SPEC.md
index b087984..1e7bc75 100644
--- a/docs/SPEC.md
+++ b/docs/SPEC.md
@@ -335,6 +335,14 @@ All UI strings are managed via `public/i18n.js`. No hardcoded text in JS files o
 2. `navigator.languages[0]` (browser language)
 3. Fallback: `de`
 
+### Supported Languages
+
+| Code | Language | Status |
+|------|----------|--------|
+| `de` | German | Reference locale (all keys defined here) |
+| `en` | English | Full translation |
+| `it` | Italian | Full translation (added v0.5.8) |
+
 ### Adding a New Language
 
 1. Create `public/locales/xx.json` (copy of `de.json`, translate)