diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..c4de427
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,181 @@
+# ==========================================================================
+# Datenbank
+# ==========================================================================
+DB_NAME=einkaufsapp
+DB_USER=einkaufsapp
+DB_PASSWORD=BITTE-AENDERN-langes-zufaelliges-passwort
+DB_ROOT_PASSWORD=BITTE-AENDERN-anderes-langes-passwort
+
+# ==========================================================================
+# Anwendung
+# ==========================================================================
+# ---- Anwendungsname ----
+# Erscheint in der Oberflaeche, im Browsertitel, auf dem Startbildschirm
+# und in allen Mails. Nach einer Aenderung genuegt:
+# docker compose up -d api
+# Der web-Container muss dafuer NICHT neu gebaut werden.
+APP_NAME=Einkaufsliste
+# Kuerzere Fassung fuer das Symbol auf dem Startbildschirm. Leer = APP_NAME.
+APP_SHORT_NAME=Einkauf
+
+# Einziger nach aussen veroeffentlichter Port. Dahinter liegt nginx,
+# das sowohl die Oberflaeche als auch /api/ ausliefert. Der api-Container
+# hat bewusst KEINEN eigenen Port nach aussen.
+HTTP_PORT=46600
+
+# Mailpit-Weboberflaeche, nur mit "--profile dev". An 127.0.0.1 gebunden.
+MAILPIT_PORT=8025
+
+# Basis-URL, wie Nutzer die App im Browser erreichen - inklusive Port,
+# falls kein vorgelagerter Reverse Proxy auf 80/443 steht.
+# Landet in Verifikations- und Einladungsmails, muss also stimmen.
+PUBLIC_BASE_URL=http://einkauf.example.de:46600
+
+# Welchen Absendern von X-Forwarded-For die API glauben darf.
+# "*" ist in Ordnung, solange api keinen oeffentlichen Port hat.
+FORWARDED_ALLOW_IPS=*
+
+SESSION_DAYS=30
+
+# Cookie nur über HTTPS ausliefern.
+# false bei direktem HTTP-Zugriff auf Port 46600
+# true sobald ein Reverse Proxy mit TLS davorsteht (dann muss
+# PUBLIC_BASE_URL ebenfalls auf https:// zeigen)
+# Ein Secure-Cookie über reines HTTP wird vom Browser verworfen - die
+# Anmeldung scheitert dann kommentarlos.
+COOKIE_SECURE=false
+
+# Dieses Konto wird als Administrator markiert, sobald es sich registriert.
+ADMIN_EMAIL=admin@example.de
+
+# Optional: Startpasswort für das erste Administratorkonto.
+#
+# - Wird NUR beim allerersten Start verwendet, und auch dann nur, wenn
+# die Datenbank noch gar keinen Nutzer enthält.
+# - Das angelegte Konto muss das Passwort bei der ersten Anmeldung
+# ändern. Bis dahin sind alle Funktionen außer "Profil lesen" und
+# "Passwort ändern" gesperrt.
+# - Danach diesen Wert wieder entfernen. Er steht im Klartext auf der
+# Platte, in jedem Backup und ist über "docker inspect" für jeden
+# lesbar, der auf den Host kommt.
+#
+# Leer lassen, um stattdessen den regulären Registrierungsweg zu nutzen.
+ADMIN_INITIAL_PASSWORD=
+
+# Alternative für Docker Secrets - hat Vorrang vor der Variablen oben:
+# ADMIN_INITIAL_PASSWORD_FILE=/run/secrets/admin_password
+
+# ==========================================================================
+# Selbstregistrierung
+# ==========================================================================
+# true Immer erlaubt. Admin-API kann es NICHT abschalten.
+# false Immer gesperrt. Zugang nur noch per Einladung (ab Phase 5).
+# Admin-API kann es NICHT einschalten.
+# admin Die Datenbankeinstellung entscheidet, der Administrator darf
+# sie zur Laufzeit umschalten. (Voreinstellung)
+ALLOW_SELF_REGISTRATION=admin
+
+# Nur relevant bei ALLOW_SELF_REGISTRATION=admin: Startwert beim
+# allerersten Start. Danach wird dieser Wert ignoriert.
+SELF_REGISTRATION_DEFAULT=true
+
+# ==========================================================================
+# Produktdatenbank
+# ==========================================================================
+# Nachschlagen gescannter Strichcodes bei Open Food Facts.
+# openfoodfacts eingeschaltet (Voreinstellung)
+# off aus - nur der eigene Artikelstamm
+#
+# Die Abfrage laeuft ueber den api-Container, nicht aus dem Browser:
+# So erfaehrt der Dienst die IP-Adressen deiner Nutzer nicht, die
+# Content-Security-Policy bleibt bei connect-src 'self', und jeder Code
+# wird nur einmal abgefragt.
+#
+# Voraussetzung: Der api-Container muss world.openfoodfacts.org
+# erreichen koennen.
+PRODUCT_LOOKUP=openfoodfacts
+
+# Gueltigkeit der zwischengespeicherten Antworten.
+PRODUCT_CACHE_DAYS=180
+# Fehlschlaege kuerzer merken - das Produkt kann spaeter eingepflegt sein.
+PRODUCT_MISS_DAYS=14
+PRODUCT_LOOKUP_TIMEOUT=6
+
+# ==========================================================================
+# Aufraeumen
+# ==========================================================================
+# Wie lange weich geloeschte Daten aufbewahrt werden. Solange kann ein
+# Geraet offline bleiben und beim naechsten Abgleich noch erfahren, dass
+# etwas verschwunden ist. Kuerzer einzustellen fuehrt dazu, dass
+# geloeschte Listen auf selten benutzten Geraeten stehenbleiben.
+CLEANUP_DELETED_DAYS=30
+# Quittungen der Outbox - verhindern doppeltes Ausfuehren.
+CLEANUP_OPS_DAYS=7
+# Abstand zwischen zwei Aufraeumdurchlaeufen.
+CLEANUP_INTERVAL_HOURS=24
+
+# ==========================================================================
+# Push-Benachrichtigungen
+# ==========================================================================
+# Schluesselpaar erzeugen mit:
+# docker compose exec api python3 /app/../tools/vapid-keys.py
+# oder lokal:
+# python3 tools/vapid-keys.py
+#
+# Leer lassen = Push abgeschaltet. Ein Wechsel des privaten Schluessels
+# entwertet alle bestehenden Geraeteanmeldungen.
+# ACHTUNG: Jede Variable darf nur EINMAL in dieser Datei stehen. Bei
+# doppelten Eintraegen nimmt Docker Compose den letzten - eine
+# vergessene leere Vorlagenzeile unterhalb des eingefuegten Werts
+# schaltet die Funktion damit still wieder ab.
+VAPID_PRIVATE_KEY=
+VAPID_PUBLIC_KEY=
+# Kontaktadresse fuer die Push-Dienste der Browserhersteller.
+# Leer = SMTP_ENVELOPE_FROM wird verwendet.
+VAPID_SUBJECT=mailto:admin@example.de
+
+# Hoechstens eine Benachrichtigung je Liste und Person in diesem Zeitraum.
+PUSH_THROTTLE_HOURS=2
+PUSH_TIMEOUT=10
+
+# ==========================================================================
+# SMTP-Relay
+# ==========================================================================
+# --- Beispiel: eigener Postfix/mailcow-Relay ---
+SMTP_HOST=mail.example.de
+SMTP_PORT=587
+SMTP_SECURITY=starttls
+SMTP_USER=einkaufsapp@example.de
+SMTP_PASSWORD=BITTE-AENDERN
+
+# --- Beispiel: Relay mit implizitem TLS ---
+# SMTP_PORT=465
+# SMTP_SECURITY=ssl
+
+# --- Beispiel: lokaler Mailpit-Container zum Testen ---
+# SMTP_HOST=mailpit
+# SMTP_PORT=1025
+# SMTP_SECURITY=none
+# SMTP_USER=
+# SMTP_PASSWORD=
+
+# Hostname im EHLO-Kommando. Sollte ein FQDN sein, der zur sendenden
+# Domain passt - sonst meldet sich der Container mit seiner ID, was bei
+# strengen Empfängern Spampunkte kostet.
+SMTP_HELO_HOSTNAME=einkauf.example.de
+
+# Absender, wie der Empfänger ihn sieht.
+SMTP_FROM=einkaufsliste@example.de
+# Leer lassen, um APP_NAME zu verwenden.
+SMTP_FROM_NAME=
+
+# Envelope-Absender (Return-Path). SPF wird gegen DIESE Adresse geprüft,
+# nicht gegen SMTP_FROM. Leer lassen = identisch mit SMTP_FROM.
+# Eine eigene Bounce-Adresse ist sinnvoll, wenn du Rückläufer auswerten willst.
+SMTP_ENVELOPE_FROM=bounces@example.de
+
+# Optional: Antworten sollen an ein Postfach gehen, das jemand liest.
+SMTP_REPLY_TO=
+
+SMTP_TIMEOUT=20
+SMTP_MAX_RETRIES=3
diff --git a/.gitignore b/.gitignore
index 77575d5..8806507 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,416 +1,43 @@
-# ---> VisualStudioCode
-.vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-!.vscode/*.code-snippets
+# ==========================================================================
+# Geheimnisse - NIEMALS ins Repository
+# ==========================================================================
+# Enthält Datenbankpasswort, SMTP-Zugangsdaten und den privaten
+# VAPID-Schlüssel. Gehört in den Passwortmanager oder in eine
+# verschlüsselte Sicherung.
+.env
+.env.*
+!.env.example
-# Local History for Visual Studio Code
-.history/
+# Docker-Secrets-Dateien
+secrets/
+*.key
+*.pem
-# Built Visual Studio Code Extensions
-*.vsix
+# ==========================================================================
+# Laufzeitdaten
+# ==========================================================================
+data/
+*.sql.gz
+*.sql.bz2
+backups/
-# ---> VisualStudio
-## Ignore Visual Studio temporary files, build results, and
-## files generated by popular Visual Studio add-ons.
-##
-## Get latest from https://github.com/github/gitignore/blob/main/VisualStudio.gitignore
-
-# User-specific files
-*.rsuser
-*.suo
-*.user
-*.userosscache
-*.sln.docstates
-
-# User-specific files (MonoDevelop/Xamarin Studio)
-*.userprefs
-
-# Mono auto generated files
-mono_crash.*
-
-# Build results
-[Dd]ebug/
-[Dd]ebugPublic/
-[Rr]elease/
-[Rr]eleases/
-x64/
-x86/
-[Ww][Ii][Nn]32/
-[Aa][Rr][Mm]/
-[Aa][Rr][Mm]64/
-bld/
-[Bb]in/
-[Oo]bj/
-[Ll]og/
-[Ll]ogs/
-
-# Visual Studio 2015/2017 cache/options directory
-.vs/
-# Uncomment if you have tasks that create the project's static files in wwwroot
-#wwwroot/
-
-# Visual Studio 2017 auto generated files
-Generated\ Files/
-
-# MSTest test Results
-[Tt]est[Rr]esult*/
-[Bb]uild[Ll]og.*
-
-# NUnit
-*.VisualState.xml
-TestResult.xml
-nunit-*.xml
-
-# Build Results of an ATL Project
-[Dd]ebugPS/
-[Rr]eleasePS/
-dlldata.c
-
-# Benchmark Results
-BenchmarkDotNet.Artifacts/
-
-# .NET Core
-project.lock.json
-project.fragment.lock.json
-artifacts/
-
-# ASP.NET Scaffolding
-ScaffoldingReadMe.txt
-
-# StyleCop
-StyleCopReport.xml
-
-# Files built by Visual Studio
-*_i.c
-*_p.c
-*_h.h
-*.ilk
-*.meta
-*.obj
-*.iobj
-*.pch
-*.pdb
-*.ipdb
-*.pgc
-*.pgd
-*.rsp
-# but not Directory.Build.rsp, as it configures directory-level build defaults
-!Directory.Build.rsp
-*.sbr
-*.tlb
-*.tli
-*.tlh
-*.tmp
-*.tmp_proj
-*_wpftmp.csproj
-*.log
-*.tlog
-*.vspscc
-*.vssscc
-.builds
-*.pidb
-*.svclog
-*.scc
-
-# Chutzpah Test files
-_Chutzpah*
-
-# Visual C++ cache files
-ipch/
-*.aps
-*.ncb
-*.opendb
-*.opensdf
-*.sdf
-*.cachefile
-*.VC.db
-*.VC.VC.opendb
-
-# Visual Studio profiler
-*.psess
-*.vsp
-*.vspx
-*.sap
-
-# Visual Studio Trace Files
-*.e2e
-
-# TFS 2012 Local Workspace
-$tf/
-
-# Guidance Automation Toolkit
-*.gpState
-
-# ReSharper is a .NET coding add-in
-_ReSharper*/
-*.[Rr]e[Ss]harper
-*.DotSettings.user
-
-# TeamCity is a build add-in
-_TeamCity*
-
-# DotCover is a Code Coverage Tool
-*.dotCover
-
-# AxoCover is a Code Coverage Tool
-.axoCover/*
-!.axoCover/settings.json
-
-# Coverlet is a free, cross platform Code Coverage Tool
-coverage*.json
-coverage*.xml
-coverage*.info
-
-# Visual Studio code coverage results
-*.coverage
-*.coveragexml
-
-# NCrunch
-_NCrunch_*
-.*crunch*.local.xml
-nCrunchTemp_*
-
-# MightyMoose
-*.mm.*
-AutoTest.Net/
-
-# Web workbench (sass)
-.sass-cache/
-
-# Installshield output folder
-[Ee]xpress/
-
-# DocProject is a documentation generator add-in
-DocProject/buildhelp/
-DocProject/Help/*.HxT
-DocProject/Help/*.HxC
-DocProject/Help/*.hhc
-DocProject/Help/*.hhk
-DocProject/Help/*.hhp
-DocProject/Help/Html2
-DocProject/Help/html
-
-# Click-Once directory
-publish/
-
-# Publish Web Output
-*.[Pp]ublish.xml
-*.azurePubxml
-# Note: Comment the next line if you want to checkin your web deploy settings,
-# but database connection strings (with potential passwords) will be unencrypted
-*.pubxml
-*.publishproj
-
-# Microsoft Azure Web App publish settings. Comment the next line if you want to
-# checkin your Azure Web App publish settings, but sensitive information contained
-# in these scripts will be unencrypted
-PublishScripts/
-
-# NuGet Packages
-*.nupkg
-# NuGet Symbol Packages
-*.snupkg
-# The packages folder can be ignored because of Package Restore
-**/[Pp]ackages/*
-# except build/, which is used as an MSBuild target.
-!**/[Pp]ackages/build/
-# Uncomment if necessary however generally it will be regenerated when needed
-#!**/[Pp]ackages/repositories.config
-# NuGet v3's project.json files produces more ignorable files
-*.nuget.props
-*.nuget.targets
-
-# Microsoft Azure Build Output
-csx/
-*.build.csdef
-
-# Microsoft Azure Emulator
-ecf/
-rcf/
-
-# Windows Store app package directories and files
-AppPackages/
-BundleArtifacts/
-Package.StoreAssociation.xml
-_pkginfo.txt
-*.appx
-*.appxbundle
-*.appxupload
-
-# Visual Studio cache files
-# files ending in .cache can be ignored
-*.[Cc]ache
-# but keep track of directories ending in .cache
-!?*.[Cc]ache/
-
-# Others
-ClientBin/
-~$*
-*~
-*.dbmdl
-*.dbproj.schemaview
-*.jfm
-*.pfx
-*.publishsettings
-orleans.codegen.cs
-
-# Including strong name files can present a security risk
-# (https://github.com/github/gitignore/pull/2483#issue-259490424)
-#*.snk
-
-# Since there are multiple workflows, uncomment next line to ignore bower_components
-# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
-#bower_components/
-
-# RIA/Silverlight projects
-Generated_Code/
-
-# Backup & report files from converting an old project file
-# to a newer Visual Studio version. Backup files are not needed,
-# because we have git ;-)
-_UpgradeReport_Files/
-Backup*/
-UpgradeLog*.XML
-UpgradeLog*.htm
-ServiceFabricBackup/
-*.rptproj.bak
-
-# SQL Server files
-*.mdf
-*.ldf
-*.ndf
-
-# Business Intelligence projects
-*.rdl.data
-*.bim.layout
-*.bim_*.settings
-*.rptproj.rsuser
-*- [Bb]ackup.rdl
-*- [Bb]ackup ([0-9]).rdl
-*- [Bb]ackup ([0-9][0-9]).rdl
-
-# Microsoft Fakes
-FakesAssemblies/
-
-# GhostDoc plugin setting file
-*.GhostDoc.xml
-
-# Node.js Tools for Visual Studio
-.ntvs_analysis.dat
-node_modules/
-
-# Visual Studio 6 build log
-*.plg
-
-# Visual Studio 6 workspace options file
-*.opt
-
-# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
-*.vbw
-
-# Visual Studio 6 auto-generated project file (contains which files were open etc.)
-*.vbp
-
-# Visual Studio 6 workspace and project file (working project files containing files to include in project)
-*.dsw
-*.dsp
-
-# Visual Studio 6 technical files
-*.ncb
-*.aps
-
-# Visual Studio LightSwitch build output
-**/*.HTMLClient/GeneratedArtifacts
-**/*.DesktopClient/GeneratedArtifacts
-**/*.DesktopClient/ModelManifest.xml
-**/*.Server/GeneratedArtifacts
-**/*.Server/ModelManifest.xml
-_Pvt_Extensions
-
-# Paket dependency manager
-.paket/paket.exe
-paket-files/
-
-# FAKE - F# Make
-.fake/
-
-# CodeRush personal settings
-.cr/personal
-
-# Python Tools for Visual Studio (PTVS)
+# ==========================================================================
+# Werkzeuge
+# ==========================================================================
__pycache__/
-*.pyc
+*.py[cod]
+.venv/
+venv/
+.mypy_cache/
+.ruff_cache/
+.pytest_cache/
-# Cake - Uncomment if you are using it
-# tools/**
-# !tools/packages.config
-
-# Tabs Studio
-*.tss
-
-# Telerik's JustMock configuration file
-*.jmconfig
-
-# BizTalk build output
-*.btp.cs
-*.btm.cs
-*.odx.cs
-*.xsd.cs
-
-# OpenCover UI analysis results
-OpenCover/
-
-# Azure Stream Analytics local run output
-ASALocalRun/
-
-# MSBuild Binary and Structured Log
-*.binlog
-
-# NVidia Nsight GPU debugger configuration file
-*.nvuser
-
-# MFractors (Xamarin productivity tool) working folder
-.mfractor/
-
-# Local History for Visual Studio
-.localhistory/
-
-# Visual Studio History (VSHistory) files
-.vshistory/
-
-# BeatPulse healthcheck temp database
-healthchecksdb
-
-# Backup folder for Package Reference Convert tool in Visual Studio 2017
-MigrationBackup/
-
-# Ionide (cross platform F# VS Code tools) working folder
-.ionide/
-
-# Fody - auto-generated XML schema
-FodyWeavers.xsd
-
-# VS Code files for those working on multiple tools
-.vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-*.code-workspace
-
-# Local History for Visual Studio Code
-.history/
-
-# Windows Installer files from build outputs
-*.cab
-*.msi
-*.msix
-*.msm
-*.msp
-
-# JetBrains Rider
-*.sln.iml
+node_modules/
+dist/
+# Editor und Betriebssystem
+.idea/
+.vscode/
+*.swp
+.DS_Store
+*.zip
diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index 67f8c65..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,232 +0,0 @@
-GNU GENERAL PUBLIC LICENSE
-Version 3, 29 June 2007
-
-Copyright © 2007 Free Software Foundation, Inc.
-
-Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
-
-Preamble
-
-The GNU General Public License is a free, copyleft license for software and other kinds of works.
-
-The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.
-
-When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for them if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs, and that you know you can do these things.
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-To protect your rights, we need to prevent others from denying you these rights or asking you to surrender the rights. Therefore, you have certain responsibilities if you distribute copies of the software, or if you modify it: responsibilities to respect the freedom of others.
-
-For example, if you distribute copies of such a program, whether gratis or for a fee, you must pass on to the recipients the same freedoms that you received. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights.
-
-Developers that use the GNU GPL protect your rights with two steps: (1) assert copyright on the software, and (2) offer you this License giving you legal permission to copy, distribute and/or modify it.
-
-For the developers' and authors' protection, the GPL clearly explains that there is no warranty for this free software. For both users' and authors' sake, the GPL requires that modified versions be marked as changed, so that their problems will not be attributed erroneously to authors of previous versions.
-
-Some devices are designed to deny users access to install or run modified versions of the software inside them, although the manufacturer can do so. This is fundamentally incompatible with the aim of protecting users' freedom to change the software. The systematic pattern of such abuse occurs in the area of products for individuals to use, which is precisely where it is most unacceptable. Therefore, we have designed this version of the GPL to prohibit the practice for those products. If such problems arise substantially in other domains, we stand ready to extend this provision to those domains in future versions of the GPL, as needed to protect the freedom of users.
-
-Finally, every program is threatened constantly by software patents. States should not allow patents to restrict development and use of software on general-purpose computers, but in those that do, we wish to avoid the special danger that patents applied to a free program could make it effectively proprietary. To prevent this, the GPL assures that patents cannot be used to render the program non-free.
-
-The precise terms and conditions for copying, distribution and modification follow.
-
-TERMS AND CONDITIONS
-
-0. Definitions.
-
-“This License” refers to version 3 of the GNU General Public License.
-
-“Copyright” also means copyright-like laws that apply to other kinds of works, such as semiconductor masks.
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-“The Program” refers to any copyrightable work licensed under this License. Each licensee is addressed as “you”. “Licensees” and “recipients” may be individuals or organizations.
-
-To “modify” a work means to copy from or adapt all or part of the work in a fashion requiring copyright permission, other than the making of an exact copy. The resulting work is called a “modified version” of the earlier work or a work “based on” the earlier work.
-
-A “covered work” means either the unmodified Program or a work based on the Program.
-
-To “propagate” a work means to do anything with it that, without permission, would make you directly or secondarily liable for infringement under applicable copyright law, except executing it on a computer or modifying a private copy. Propagation includes copying, distribution (with or without modification), making available to the public, and in some countries other activities as well.
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-An interactive user interface displays “Appropriate Legal Notices” to the extent that it includes a convenient and prominently visible feature that (1) displays an appropriate copyright notice, and (2) tells the user that there is no warranty for the work (except to the extent that warranties are provided), that licensees may convey the work under this License, and how to view a copy of this License. If the interface presents a list of user commands or options, such as a menu, a prominent item in the list meets this criterion.
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-
- einkaufsapp
- Copyright (C) 2026 marco.morath
-
- This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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-Also add information on how to contact you by electronic and paper mail.
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- einkaufsapp Copyright (C) 2026 marco.morath
- This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
- This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details.
-
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-The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read .
diff --git a/README.md b/README.md
index 3548433..9bcfb0d 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,1156 @@
-# einkaufsapp
+# Einkaufsapp – Phase 0 & 1
-Plattformunabhängige Einkaufsapp
\ No newline at end of file
+Backend-Grundgerüst mit Registrierung, Mailverifikation, Login und
+Administrationsschalter, dazu nginx als einziger Eintrittspunkt.
+
+## Ports
+
+Nach außen ist genau **ein** Port offen: `HTTP_PORT` aus der `.env`,
+voreingestellt `46600`. Dahinter liegt nginx und verteilt:
+
+| Pfad | Ziel |
+|---|---|
+| `/` | statische Dateien (ab Phase 3 die gebaute PWA) |
+| `/api/…` | FastAPI |
+| `/docs`, `/openapi.json` | FastAPI-Dokumentation |
+| `/healthz`, `/readyz` | Statusprüfungen |
+
+Der `api`-Container hat keinen veröffentlichten Port. Wenn du ihn zum
+Debuggen doch direkt erreichen willst, leg eine
+`docker-compose.override.yml` an:
+
+```yaml
+services:
+ api:
+ ports:
+ - "127.0.0.1:8000:8000"
+```
+
+Die Bindung an `127.0.0.1` ist wichtig – sonst hängt eine ungeschützte API
+am öffentlichen Interface.
+
+## Start
+
+```bash
+cp .env.example .env
+# DB_PASSWORD, DB_ROOT_PASSWORD und ADMIN_EMAIL setzen
+
+docker compose --profile dev up -d --build
+docker compose ps
+docker compose logs -f api web
+```
+
+Erwartete Log-Ausgabe:
+
+```
+[entrypoint] Warte auf Datenbank db:3306 ...
+[wait_for_db] Datenbank erreichbar.
+[entrypoint] Migrationen einspielen ...
+INFO [alembic.runtime.migration] Running upgrade -> 0001
+[entrypoint] Starte API.
+INFO: Application startup complete.
+```
+
+### Ersteinrichtung im Browser
+
+1. `ADMIN_INITIAL_PASSWORD` in der `.env` setzen
+2. `docker compose up -d` – **nicht** `restart`: ein Neustart übernimmt keine
+ geänderten Werte aus der `.env`, der Container muss neu angelegt werden
+3. `http://:46600/` aufrufen, mit `ADMIN_EMAIL` und dem Startpasswort
+ anmelden
+4. Die Oberfläche verlangt sofort ein neues Passwort – erst danach ist alles
+ andere erreichbar
+5. `ADMIN_INITIAL_PASSWORD` wieder aus der `.env` entfernen
+
+Ohne Startpasswort führt derselbe Weg über „Konto anlegen"; dann brauchst du
+für die Bestätigungsmail allerdings einen funktionierenden SMTP-Relay oder
+Mailpit.
+
+Oberfläche: `http://:46600/`
+Interaktive API-Dokumentation: `http://:46600/docs`
+Abgefangene Mails (nur mit `--profile dev`): `http://localhost:8025`
+
+## Durchklicken
+
+```bash
+curl -s localhost:46600/readyz
+
+# 1. Registrieren
+curl -s -X POST localhost:46600/api/auth/register \
+ -H 'Content-Type: application/json' \
+ -d '{"email":"admin@example.com","password":"ein-langes-testpasswort"}'
+
+# 2. Link aus Mailpit (http://localhost:8025) im Browser öffnen
+# oder: curl -s "localhost:46600/api/auth/verify?token="
+
+# 3. Anmelden – Cookies in eine Datei schreiben
+curl -s -c cookies.txt -X POST localhost:46600/api/auth/login \
+ -H 'Content-Type: application/json' \
+ -d '{"email":"admin@example.com","password":"ein-langes-testpasswort"}'
+
+# 4. Eigenes Profil lesen (nur Session-Cookie nötig)
+curl -s -b cookies.txt localhost:46600/api/auth/me
+
+# 5. Schreibender Request braucht zusätzlich den CSRF-Header
+CSRF=$(grep ea_csrf cookies.txt | awk '{print $7}')
+curl -s -b cookies.txt -H "X-CSRF-Token: $CSRF" \
+ -X PUT localhost:46600/api/admin/settings \
+ -H 'Content-Type: application/json' \
+ -d '{"allow_self_registration": false}'
+```
+
+Schritt 5 ohne den Header muss mit `403 CSRF-Token fehlt oder ungültig`
+abgewiesen werden – das ist der Test, ob der Schutz greift.
+
+### Mailversand prüfen
+
+```bash
+# Verbindung zum Relay, ohne etwas zu senden
+curl -s -b cookies.txt localhost:46600/api/admin/mail/check
+
+# Testnachricht
+curl -s -b cookies.txt -H "X-CSRF-Token: $CSRF" \
+ -X POST localhost:46600/api/admin/mail/test \
+ -H 'Content-Type: application/json' \
+ -d '{"to":"dein-postfach@example.de"}'
+
+docker compose logs --tail=20 api
+```
+
+## Was hier absichtlich so ist
+
+**Erstes Administratorkonto – zwei Wege.**
+
+*Ohne Startpasswort* (`ADMIN_INITIAL_PASSWORD` leer): Du registrierst dich
+regulär über `POST /api/auth/register`. Stimmt die Adresse mit `ADMIN_EMAIL`
+überein, wird das Konto zum Administrator. Kein Passwort liegt jemals in der
+Umgebung – dafür brauchst du für die Bestätigung entweder Mailpit oder ein
+`UPDATE` in der Datenbank.
+
+*Mit Startpasswort*: Setz `ADMIN_INITIAL_PASSWORD` in der `.env`. Beim ersten
+Start legt die Anwendung das Konto an, bestätigt es sofort und markiert es mit
+`must_change_password`. Bis das Passwort geändert ist, antworten alle Routen
+außer `GET /api/auth/me` und `POST /api/auth/password/change` mit `403`.
+
+Die Absicherungen sind bewusst eng: Das Konto entsteht nur, wenn die Datenbank
+noch **gar keinen** Nutzer enthält. Ein vergessener Eintrag in der `.env` kann
+damit weder ein bestehendes Konto überschreiben noch ein zweites Admin-Konto
+nachschieben – die Anwendung protokolliert stattdessen eine Warnung.
+
+Trotzdem: Nach der ersten Anmeldung gehört der Wert aus der `.env` entfernt.
+Er steht dort im Klartext, liegt in jedem Backup und ist über
+`docker inspect einkaufsapp_api` für jeden lesbar, der Zugriff auf den Host
+hat. Für Docker Secrets gibt es `ADMIN_INITIAL_PASSWORD_FILE`.
+
+**Registrierung antwortet immer gleich.** Ob eine Adresse schon existiert,
+verrät die API nicht – weder über den Statuscode noch über die Laufzeit. Beim
+Login läuft die Passwortprüfung auch bei unbekanntem Konto gegen einen
+Dummy-Hash, damit die Antwortzeit konstant bleibt.
+
+**Rate Limiting sowohl pro IP als auch pro Konto.** Nur pro IP zu begrenzen
+hilft nicht gegen verteilte Angriffe auf ein einzelnes Konto; nur pro Konto zu
+begrenzen macht das Aussperren fremder Nutzer trivial.
+
+**`restart: "no"` beim API-Container.** Während der Entwicklung soll ein
+Startfehler zu einem stehenden Container führen, nicht zu einer Endlosschleife,
+die das Log flutet. Für den Produktivbetrieb auf `unless-stopped` ändern.
+
+**Selbstregistrierung: drei Zustände statt zwei.** `ALLOW_SELF_REGISTRATION`
+kennt `true`, `false` und `admin`. Bei `true`/`false` ist der Wert fest
+verdrahtet, die Admin-API antwortet auf Änderungsversuche mit `409` und nennt
+den Grund. Bei `admin` entscheidet die Datenbankeinstellung und der
+Administrator darf zur Laufzeit umschalten. `SELF_REGISTRATION_DEFAULT` ist
+dann der Startwert beim allerersten Start.
+
+Die Alternative wäre gewesen, die Umgebungsvariable bei jedem Neustart über die
+Admin-Einstellung schreiben zu lassen – dann wäre eine Abschaltung nach dem
+nächsten `docker compose up` still wieder verschwunden.
+
+**SMTP-Relay.** `SMTP_SECURITY` ersetzt die vorherigen Flags `SMTP_STARTTLS`
+und `SMTP_SSL`; erlaubt sind `none`, `starttls` und `ssl`. Beim Start prüft die
+Anwendung, dass keine Zugangsdaten über eine unverschlüsselte Verbindung gehen,
+und bricht sonst mit einer klaren Meldung ab. Details zu SPF, DKIM, DMARC und
+PTR stehen in `docs/mail-zustellbarkeit.md`.
+
+**Ein Port statt zwei.** Oberfläche und API teilen sich dieselbe Origin.
+Damit entfällt CORS vollständig, Cookies verhalten sich vorhersagbar, und der
+Service Worker in Phase 4 kann API-Antworten ohne Sonderregeln cachen. Zwei
+Ports hätten drei zusätzliche Fehlerquellen eingeführt, ohne etwas zu gewinnen.
+
+**`COOKIE_SECURE` muss zum Zugriffsweg passen.** Bei direktem HTTP-Zugriff auf
+Port 46600 gehört `false` in die `.env`. Steht ein Reverse Proxy mit TLS davor
+– bei dir vermutlich OPNsense –, dann `true` und `PUBLIC_BASE_URL` auf
+`https://…`. Ein `Secure`-Cookie über reines HTTP wird vom Browser verworfen,
+und die Anmeldung scheitert dann ohne verständliche Fehlermeldung.
+
+**CSP ohne `unsafe-inline`.** Die Platzhalterseite lagert deshalb CSS und
+JavaScript in eigene Dateien aus. Wenn du dort etwas ergänzt: Inline-`
+
+