Initial: Rust-Backend mit Clean Architecture (domain/application/infrastructure/api)

Vier-Crate-Workspace mit: - Domain: Account, Car, Tour, Delivery, DeliveryItem, DeliveryNote, Customer, Article, Warehouse, ScanState, AuditAction — alle mit serde + feature-gated utoipa::ToSchema. - Application: Ports (TourRepository, DeliveryRepository, ScanRepository, DeliveryNoteRepository, CarRepository, AuthService) und Use Cases. - Infrastructure: Postgres-Adapter via sqlx (PgTourRepository etc.) + Keycloak-AuthService mit JWKS-Cache + OIDC-Discovery. - API: Axum 0.8, utoipa-OpenAPI + Swagger-UI, JWT-Bearer-Middleware, AuthenticatedUser-Extractor. Endpoints: - GET /me/tours/today, /tours/{id}, /accounts/{pn}, /me/cars, /health - POST /sync/tour, /scans (bulk + idempotent via clientScanId), /deliveries/{id}/{hold,resume,cancel,complete,notes}, /me/cars - PUT /tours/{id}/delivery-order, /deliveries/{id}/assigned-car, /me/cars/{id} - PATCH /me/cars/{id} Datenmodell: - 6 Migrationen (accounts, tours/deliveries/items + Stammdaten, scan_audit mit clientScanId-UNIQUE, state_reason refactor, delivery_notes, cars + FKs nachziehen). - Business-stabile Beleg-Keys (belegart_id, belegnummer) für ERP-Sync. - Append-only scan_audit + embedded scan_state als doppelte Wahrheit. Dev-Setup: - docker-compose mit Postgres 17 + Keycloak 26 - Keycloak-Realm 'holzleitner' mit Public-Client (PKCE), Testfahrer (PN 1001) + Audience-/Personalnummer-Mapper
2026-05-14 22:28:31 +02:00
commit 438040acce
83 changed files with 8922 additions and 0 deletions
--- a/crates/api/Cargo.toml
+++ b/crates/api/Cargo.toml
@ -0,0 +1,32 @@
+[package]
+name = "holzleitner-api"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+
+[[bin]]
+name = "holzleitner-server"
+path = "src/main.rs"
+
+[dependencies]
+holzleitner-domain = { workspace = true, features = ["openapi"] }
+holzleitner-application = { workspace = true, features = ["openapi"] }
+holzleitner-infrastructure.workspace = true
+utoipa.workspace = true
+utoipa-swagger-ui.workspace = true
+axum.workspace = true
+tokio.workspace = true
+tower.workspace = true
+tower-http.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+uuid.workspace = true
+chrono.workspace = true
+thiserror.workspace = true
+anyhow.workspace = true
+envy.workspace = true
+dotenvy.workspace = true
+sqlx.workspace = true
--- a/crates/api/src/config.rs
+++ b/crates/api/src/config.rs
@ -0,0 +1,97 @@
+//! Konfiguration aus Umgebungsvariablen (12-Factor-Stil).
+//!
+//! Für lokale Entwicklung lädt [`load`] zunächst eine optionale `.env`
+//! Datei und parst dann pro Bereich (Server, Database, Keycloak) mit
+//! Prefix-Filter über `envy`. So bleiben die Strukturen klar getrennt
+//! und Fehlermeldungen verraten den genauen Bereich.
+
+use serde::Deserialize;
+
+#[derive(Debug, Clone)]
+pub struct Config {
+    pub server: ServerConfig,
+    pub database: DatabaseConfig,
+    #[allow(dead_code)] // wird in der Keycloak-Phase verdrahtet
+    pub keycloak: KeycloakConfig,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct ServerConfig {
+    pub host: String,
+    pub port: u16,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct DatabaseConfig {
+    pub url: String,
+    #[serde(default = "default_max_connections")]
+    pub max_connections: u32,
+}
+
+fn default_max_connections() -> u32 {
+    10
+}
+
+/// Felder werden in der Keycloak-Phase angefasst — bis dahin Dead-Code-
+/// Warnings unterdrücken.
+#[allow(dead_code)]
+#[derive(Debug, Clone, Deserialize)]
+pub struct KeycloakConfig {
+    pub issuer_url: String,
+    pub audience: String,
+    #[serde(default = "default_jwks_cache_ttl")]
+    pub jwks_cache_ttl_seconds: u64,
+}
+
+fn default_jwks_cache_ttl() -> u64 {
+    3600
+}
+
+/// Lädt die Konfiguration aus Umgebungsvariablen.
+///
+/// Reihenfolge:
+/// 1. Optionale `.env`-Datei im Arbeitsverzeichnis (für Local-Dev).
+/// 2. Pro Bereich werden Variablen mit passendem Prefix gelesen:
+///    * `SERVER_*`     für [`ServerConfig`]
+///    * `DATABASE_*`   für [`DatabaseConfig`]
+///    * `KEYCLOAK_*`   für [`KeycloakConfig`]
+pub fn load() -> Result<Config, ConfigError> {
+    // `.env` ist optional — in Produktion kommen die Werte aus dem
+    // System-Environment.
+    let _ = dotenvy::dotenv();
+
+    let server = envy::prefixed("SERVER_")
+        .from_env::<ServerConfig>()
+        .map_err(|e| ConfigError::Section {
+            section: "SERVER",
+            source: e,
+        })?;
+    let database = envy::prefixed("DATABASE_")
+        .from_env::<DatabaseConfig>()
+        .map_err(|e| ConfigError::Section {
+            section: "DATABASE",
+            source: e,
+        })?;
+    let keycloak = envy::prefixed("KEYCLOAK_")
+        .from_env::<KeycloakConfig>()
+        .map_err(|e| ConfigError::Section {
+            section: "KEYCLOAK",
+            source: e,
+        })?;
+
+    Ok(Config {
+        server,
+        database,
+        keycloak,
+    })
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum ConfigError {
+    #[error("missing or invalid env vars in section {section}: {source}")]
+    Section {
+        section: &'static str,
+        #[source]
+        source: envy::Error,
+    },
+}
--- a/crates/api/src/error.rs
+++ b/crates/api/src/error.rs
@ -0,0 +1,51 @@
+use axum::Json;
+use axum::http::StatusCode;
+use axum::response::{IntoResponse, Response};
+use holzleitner_application::error::ApplicationError;
+use holzleitner_application::ports::AuthError;
+use serde_json::json;
+
+/// HTTP-Adapter für Application-Fehler. Mappt jede Variante auf
+/// einen Statuscode + JSON-Body. Verhindert, dass interne Details
+/// (z. B. SQL-Fehler) versehentlich in die Antwort durchschlagen —
+/// das eigentliche Detail wird über `tracing` geloggt.
+pub struct ApiError(pub ApplicationError);
+
+impl From<ApplicationError> for ApiError {
+    fn from(value: ApplicationError) -> Self {
+        Self(value)
+    }
+}
+
+impl From<AuthError> for ApiError {
+    fn from(err: AuthError) -> Self {
+        // Auth-Detail für Debugging loggen, aber NICHT an den Client geben —
+        // dort sehen wir nur „Unauthorized" / „internal error".
+        tracing::debug!(error = %err, "auth verification failed");
+        ApiError(err.into())
+    }
+}
+
+impl IntoResponse for ApiError {
+    fn into_response(self) -> Response {
+        let (status, code) = match &self.0 {
+            ApplicationError::NotFound => (StatusCode::NOT_FOUND, "not_found"),
+            ApplicationError::Unauthorized => (StatusCode::UNAUTHORIZED, "unauthorized"),
+            ApplicationError::Forbidden => (StatusCode::FORBIDDEN, "forbidden"),
+            ApplicationError::Validation(_) => (StatusCode::BAD_REQUEST, "validation"),
+            ApplicationError::Repository(_)
+            | ApplicationError::External(_)
+            | ApplicationError::Unexpected(_) => {
+                tracing::error!(error = %self.0, "internal error");
+                (StatusCode::INTERNAL_SERVER_ERROR, "internal_error")
+            }
+        };
+
+        let body = Json(json!({
+            "error": code,
+            "message": self.0.to_string(),
+        }));
+
+        (status, body).into_response()
+    }
+}
--- a/crates/api/src/extractors.rs
+++ b/crates/api/src/extractors.rs
@ -0,0 +1,41 @@
+//! Eigene Axum-Extractoren für die API-Schicht.
+//!
+//! Da Axums Trait `FromRequestParts` und das fremde `Claims`-Struct
+//! aus `holzleitner_application` jeweils Fremd-Items sind (Rust-
+//! Orphan-Rule), wickeln wir `Claims` in einen lokalen Newtype
+//! `AuthenticatedUser`. Handler signaturen werden damit lesbarer als
+//! mit `axum::extract::Extension<Claims>` und liefern bei fehlender
+//! Authentifizierung einen konsistenten 401-Fehler.
+
+use axum::extract::FromRequestParts;
+use axum::http::request::Parts;
+use holzleitner_application::error::ApplicationError;
+use holzleitner_application::ports::Claims;
+
+use crate::error::ApiError;
+
+/// Wrapper-Extractor für `Claims` aus der JWT-Middleware.
+///
+/// Verwendung im Handler:
+/// ```ignore
+/// async fn handler(AuthenticatedUser(claims): AuthenticatedUser, ...) { ... }
+/// ```
+pub struct AuthenticatedUser(pub Claims);
+
+impl<S> FromRequestParts<S> for AuthenticatedUser
+where
+    S: Send + Sync,
+{
+    type Rejection = ApiError;
+
+    async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result<Self, Self::Rejection> {
+        parts
+            .extensions
+            .get::<Claims>()
+            .cloned()
+            .map(AuthenticatedUser)
+            // Sollte nicht passieren wenn die Route hinter der Middleware
+            // hängt — wir behandeln es als Programmier-/Konfig-Fehler.
+            .ok_or(ApiError(ApplicationError::Unauthorized))
+    }
+}
--- a/crates/api/src/main.rs
+++ b/crates/api/src/main.rs
@ -0,0 +1,158 @@
+//! Holzleitner-API — HTTP-Layer und Composition Root.
+//!
+//! Bootstrap-Reihenfolge:
+//! 1. Tracing/Logging initialisieren
+//! 2. Konfiguration aus Env-Variablen / `.env` laden
+//! 3. Postgres-Pool aufbauen und Migrations ausführen
+//! 4. Keycloak-AuthService instanziieren
+//! 5. Use Cases zusammenstellen und in `AppState` packen
+//! 6. Public + Protected Router komponieren und Server starten
+
+mod config;
+mod error;
+mod extractors;
+mod middleware;
+mod openapi;
+mod routes;
+mod state;
+
+use std::net::SocketAddr;
+use std::sync::Arc;
+use std::time::Duration;
+
+use anyhow::Context;
+use axum::Router;
+use axum::middleware::from_fn_with_state;
+use holzleitner_application::usecases::{
+    ApplyDeliveryActionUseCase, ApplyScansUseCase, AssignCarToDeliveryUseCase,
+    CreateDeliveryNoteUseCase, CreateMyCarUseCase, GetAccountUseCase, GetTourUseCase,
+    ListMyCarsUseCase, ListMyToursTodayUseCase, SetDeliveryOrderUseCase, SyncTourUseCase,
+    UpdateMyCarUseCase,
+};
+use holzleitner_infrastructure::auth::{KeycloakAdapterConfig, KeycloakAuthService};
+use holzleitner_infrastructure::persistence::{
+    PgAccountRepository, PgCarRepository, PgDeliveryNoteRepository, PgDeliveryRepository,
+    PgScanRepository, PgTourRepository, PoolConfig, connect_and_migrate,
+};
+use tower_http::trace::TraceLayer;
+use utoipa::OpenApi;
+use utoipa_swagger_ui::SwaggerUi;
+
+use crate::middleware::jwt_middleware;
+use crate::openapi::ApiDoc;
+use crate::state::AppState;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| {
+                "holzleitner_api=info,holzleitner_infrastructure=info,tower_http=info".into()
+            }),
+        )
+        .init();
+
+    let cfg = config::load().context("config laden fehlgeschlagen")?;
+    tracing::info!(host = %cfg.server.host, port = cfg.server.port, "starting up");
+
+    // --- Persistence ---------------------------------------------------
+    let pool = connect_and_migrate(&PoolConfig {
+        url: cfg.database.url.clone(),
+        max_connections: cfg.database.max_connections,
+    })
+    .await
+    .context("Postgres-Verbindung / Migrations fehlgeschlagen")?;
+    tracing::info!("postgres connected, migrations applied");
+
+    let account_repository = Arc::new(PgAccountRepository::new(pool.clone()));
+    let tour_repository = Arc::new(PgTourRepository::new(pool.clone()));
+    let scan_repository = Arc::new(PgScanRepository::new(pool.clone()));
+    let delivery_repository = Arc::new(PgDeliveryRepository::new(pool.clone()));
+    let delivery_note_repository = Arc::new(PgDeliveryNoteRepository::new(pool.clone()));
+    let car_repository = Arc::new(PgCarRepository::new(pool));
+
+    // --- Auth ----------------------------------------------------------
+    let auth_service = Arc::new(KeycloakAuthService::new(KeycloakAdapterConfig {
+        issuer_url: cfg.keycloak.issuer_url.clone(),
+        audience: cfg.keycloak.audience.clone(),
+        jwks_cache_ttl: Duration::from_secs(cfg.keycloak.jwks_cache_ttl_seconds),
+    }));
+    tracing::info!(
+        issuer = %cfg.keycloak.issuer_url,
+        audience = %cfg.keycloak.audience,
+        "keycloak adapter ready"
+    );
+
+    // --- Use Cases -----------------------------------------------------
+    let get_account = Arc::new(GetAccountUseCase::new(account_repository));
+    let get_tour = Arc::new(GetTourUseCase::new(tour_repository.clone()));
+    let list_my_tours_today = Arc::new(ListMyToursTodayUseCase::new(tour_repository.clone()));
+    let sync_tour = Arc::new(SyncTourUseCase::new(tour_repository.clone()));
+    let set_delivery_order = Arc::new(SetDeliveryOrderUseCase::new(tour_repository));
+    let apply_scans = Arc::new(ApplyScansUseCase::new(
+        scan_repository,
+        car_repository.clone(),
+    ));
+    let apply_delivery_action =
+        Arc::new(ApplyDeliveryActionUseCase::new(delivery_repository.clone()));
+    let create_delivery_note = Arc::new(CreateDeliveryNoteUseCase::new(
+        delivery_note_repository,
+        car_repository.clone(),
+    ));
+    let list_my_cars = Arc::new(ListMyCarsUseCase::new(car_repository.clone()));
+    let create_my_car = Arc::new(CreateMyCarUseCase::new(car_repository.clone()));
+    let update_my_car = Arc::new(UpdateMyCarUseCase::new(car_repository.clone()));
+    let assign_car_to_delivery = Arc::new(AssignCarToDeliveryUseCase::new(
+        car_repository,
+        delivery_repository,
+    ));
+
+    let state = AppState {
+        get_account,
+        get_tour,
+        list_my_tours_today,
+        sync_tour,
+        set_delivery_order,
+        apply_scans,
+        apply_delivery_action,
+        create_delivery_note,
+        list_my_cars,
+        create_my_car,
+        update_my_car,
+        assign_car_to_delivery,
+        auth_service,
+    };
+
+    // --- Router --------------------------------------------------------
+    //
+    // Public-Routen (Health, OpenAPI-Spec, Swagger-UI) und Protected-
+    // Routen werden getrennt gebaut; die JWT-Middleware liegt **nur**
+    // auf dem protected-Subtree. `route_layer` greift nur für die jetzt
+    // definierten Routen — neue Routen darunter müssten explizit
+    // nochmal angehängt werden.
+    let public = Router::new()
+        .merge(routes::health::router())
+        .merge(SwaggerUi::new("/swagger-ui").url("/openapi.json", ApiDoc::openapi()));
+    let protected = Router::new()
+        .merge(routes::accounts::router())
+        .merge(routes::tours::router())
+        .merge(routes::scans::router())
+        .merge(routes::deliveries::router())
+        .merge(routes::cars::router())
+        .route_layer(from_fn_with_state(state.clone(), jwt_middleware));
+
+    let app = Router::new()
+        .merge(public)
+        .merge(protected)
+        .layer(TraceLayer::new_for_http())
+        .with_state(state);
+
+    let addr: SocketAddr = format!("{}:{}", cfg.server.host, cfg.server.port)
+        .parse()
+        .with_context(|| format!("ungültige Adresse {}:{}", cfg.server.host, cfg.server.port))?;
+    let listener = tokio::net::TcpListener::bind(addr).await?;
+    tracing::info!("server läuft auf http://{}", addr);
+    axum::serve(listener, app).await?;
+
+    Ok(())
+}
--- a/crates/api/src/middleware/jwt.rs
+++ b/crates/api/src/middleware/jwt.rs
@ -0,0 +1,46 @@
+//! JWT-Middleware: extrahiert das Bearer-Token, ruft den `AuthService`
+//! aus dem `AppState` und hängt die verifizierten `Claims` als Request-
+//! Extension an. Nachgelagerte Handler greifen darüber per
+//! `AuthenticatedUser`-Extractor zu.
+
+use axum::extract::{Request, State};
+use axum::http::HeaderMap;
+use axum::http::header::AUTHORIZATION;
+use axum::middleware::Next;
+use axum::response::Response;
+use holzleitner_application::ports::AuthError;
+
+use crate::error::ApiError;
+use crate::state::AppState;
+
+pub async fn jwt_middleware(
+    State(state): State<AppState>,
+    mut req: Request,
+    next: Next,
+) -> Result<Response, ApiError> {
+    let bearer = extract_bearer(req.headers()).ok_or(ApiError::from(AuthError::MissingToken))?;
+
+    let claims = state
+        .auth_service
+        .verify_token(bearer)
+        .await
+        .map_err(ApiError::from)?;
+
+    tracing::debug!(
+        personalnummer = claims.personalnummer,
+        subject = %claims.subject,
+        roles = ?claims.roles,
+        "auth ok",
+    );
+    req.extensions_mut().insert(claims);
+
+    Ok(next.run(req).await)
+}
+
+fn extract_bearer(headers: &HeaderMap) -> Option<&str> {
+    headers
+        .get(AUTHORIZATION)?
+        .to_str()
+        .ok()?
+        .strip_prefix("Bearer ")
+}
--- a/crates/api/src/middleware/mod.rs
+++ b/crates/api/src/middleware/mod.rs
@ -0,0 +1,6 @@
+//! Axum-Middleware — z. B. JWT-Validierung gegen den
+//! `holzleitner_application::ports::AuthService`.
+
+pub mod jwt;
+
+pub use jwt::jwt_middleware;
--- a/crates/api/src/openapi.rs
+++ b/crates/api/src/openapi.rs
@ -0,0 +1,118 @@
+//! OpenAPI-Aggregation: zieht alle annotierten Handler und Schemata in
+//! ein einziges Dokument zusammen, das der `/openapi.json`-Endpoint
+//! serviert und Swagger-UI darstellt.
+//!
+//! Neue Endpoints werden hier in `paths(...)` registriert, neue Schemata
+//! in `components(schemas(...))`. Die Annotation am Handler (via
+//! `#[utoipa::path(...)]`) liefert die eigentliche Beschreibung.
+
+use utoipa::Modify;
+use utoipa::OpenApi;
+use utoipa::openapi::security::{HttpAuthScheme, HttpBuilder, SecurityScheme};
+
+#[derive(OpenApi)]
+#[openapi(
+    info(
+        title = "Holzleitner Backend API",
+        version = "0.1.0",
+        description = "Backend für die Holzleitner-Lieferservice-App — Tour, Beladung, Ausführung."
+    ),
+    paths(
+        crate::routes::health::health,
+        crate::routes::accounts::get_account,
+        crate::routes::tours::list_my_tours_today,
+        crate::routes::tours::get_tour,
+        crate::routes::tours::set_delivery_order,
+        crate::routes::tours::sync_tour,
+        crate::routes::scans::apply_scans,
+        crate::routes::deliveries::hold,
+        crate::routes::deliveries::resume,
+        crate::routes::deliveries::cancel,
+        crate::routes::deliveries::complete,
+        crate::routes::deliveries::create_note,
+        crate::routes::deliveries::assign_car,
+        crate::routes::cars::list_my_cars,
+        crate::routes::cars::create_my_car,
+        crate::routes::cars::update_my_car,
+    ),
+    components(
+        schemas(
+            holzleitner_domain::Account,
+            holzleitner_domain::Address,
+            holzleitner_domain::Article,
+            holzleitner_domain::AuditAction,
+            holzleitner_domain::Car,
+            holzleitner_domain::Customer,
+            holzleitner_domain::CustomerContact,
+            holzleitner_domain::Delivery,
+            holzleitner_domain::DeliveryItem,
+            holzleitner_domain::DeliveryNote,
+            holzleitner_domain::DeliveryState,
+            holzleitner_domain::ScanState,
+            holzleitner_domain::ScanStatus,
+            holzleitner_domain::Tour,
+            holzleitner_domain::Warehouse,
+            holzleitner_application::dto::TourDetails,
+            holzleitner_application::dto::DeliveryWithItems,
+            holzleitner_application::dto::TourSummary,
+            holzleitner_application::dto::SyncTourRequest,
+            holzleitner_application::dto::SyncDelivery,
+            holzleitner_application::dto::SyncDeliveryItem,
+            holzleitner_application::dto::SetDeliveryOrderRequest,
+            holzleitner_application::dto::SetDeliveryOrderResponse,
+            holzleitner_application::dto::DeliveryOrderEntry,
+            holzleitner_application::dto::ApplyScansRequest,
+            holzleitner_application::dto::ApplyScansResponse,
+            holzleitner_application::dto::ScanEvent,
+            holzleitner_application::dto::ScanResult,
+            holzleitner_application::dto::ScanResultStatus,
+            holzleitner_application::dto::HoldDeliveryRequest,
+            holzleitner_application::dto::CancelDeliveryRequest,
+            holzleitner_application::dto::DeliveryResponse,
+            holzleitner_application::dto::CreateDeliveryNoteRequest,
+            holzleitner_application::dto::DeliveryNoteResponse,
+            holzleitner_application::dto::CreateCarRequest,
+            holzleitner_application::dto::UpdateCarRequest,
+            holzleitner_application::dto::CarResponse,
+            holzleitner_application::dto::CarsList,
+            holzleitner_application::dto::AssignCarRequest,
+            crate::routes::tours::TourSummaryList,
+            crate::routes::tours::SyncTourResponse,
+        )
+    ),
+    modifiers(&SecurityAddon),
+    tags(
+        (name = "health", description = "Health- und Status-Endpoints"),
+        (name = "accounts", description = "Account-Stammdaten"),
+        (name = "tours", description = "Touren der Fahrer"),
+        (name = "sync", description = "ERP-Sync-Endpunkte"),
+        (name = "scans", description = "Scan-Events (Beladung & Auslieferung)"),
+        (name = "deliveries", description = "Delivery-Lifecycle (hold / resume / cancel / complete)"),
+        (name = "cars", description = "Fahrzeug-Stammdaten pro Fahrer"),
+    ),
+    security(
+        ("bearer_auth" = [])
+    )
+)]
+pub struct ApiDoc;
+
+/// Hängt das `bearer_auth`-Security-Scheme nachträglich in die Spec ein —
+/// das geht nur über einen `Modify`-Hook, weil derive-Macros das nicht
+/// direkt erlauben.
+struct SecurityAddon;
+
+impl Modify for SecurityAddon {
+    fn modify(&self, openapi: &mut utoipa::openapi::OpenApi) {
+        if let Some(components) = openapi.components.as_mut() {
+            components.add_security_scheme(
+                "bearer_auth",
+                SecurityScheme::Http(
+                    HttpBuilder::new()
+                        .scheme(HttpAuthScheme::Bearer)
+                        .bearer_format("JWT")
+                        .build(),
+                ),
+            );
+        }
+    }
+}
--- a/crates/api/src/routes/accounts.rs
+++ b/crates/api/src/routes/accounts.rs
@ -0,0 +1,44 @@
+use axum::Json;
+use axum::Router;
+use axum::extract::{Path, State};
+use axum::routing::get;
+use holzleitner_domain::Account;
+
+use crate::error::ApiError;
+use crate::extractors::AuthenticatedUser;
+use crate::state::AppState;
+
+pub fn router() -> Router<AppState> {
+    Router::new().route("/accounts/{personalnummer}", get(get_account))
+}
+
+/// Liest den Account zu einer Personalnummer.
+#[utoipa::path(
+    get,
+    path = "/accounts/{personalnummer}",
+    tag = "accounts",
+    params(
+        ("personalnummer" = i64, Path, description = "Personalnummer des Accounts")
+    ),
+    responses(
+        (status = 200, description = "Account gefunden", body = Account),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Kein Account zu dieser Personalnummer")
+    ),
+    security(
+        ("bearer_auth" = [])
+    )
+)]
+pub async fn get_account(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(personalnummer): Path<i64>,
+) -> Result<Json<Account>, ApiError> {
+    tracing::debug!(
+        caller = claims.personalnummer,
+        target = personalnummer,
+        "get_account",
+    );
+    let account = state.get_account.execute(personalnummer).await?;
+    Ok(Json(account))
+}
--- a/crates/api/src/routes/cars.rs
+++ b/crates/api/src/routes/cars.rs
@ -0,0 +1,108 @@
+use axum::Json;
+use axum::Router;
+use axum::extract::{Path, Query, State};
+use axum::routing::{get, patch};
+use holzleitner_application::dto::{
+    CarResponse, CarsList, CreateCarRequest, UpdateCarRequest,
+};
+use serde::Deserialize;
+use uuid::Uuid;
+
+use crate::error::ApiError;
+use crate::extractors::AuthenticatedUser;
+use crate::state::AppState;
+
+pub fn router() -> Router<AppState> {
+    Router::new()
+        .route("/me/cars", get(list_my_cars).post(create_my_car))
+        .route("/me/cars/{car_id}", patch(update_my_car))
+}
+
+/// Query-Parameter für `GET /me/cars`.
+#[derive(Debug, Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct ListCarsQuery {
+    /// Default `false` — Endpoint liefert standardmäßig auch
+    /// deaktivierte Fahrzeuge **nicht** mit.
+    #[serde(default)]
+    pub include_inactive: bool,
+}
+
+/// Listet die Fahrzeuge des angemeldeten Fahrers.
+#[utoipa::path(
+    get,
+    path = "/me/cars",
+    tag = "cars",
+    params(
+        ("includeInactive" = Option<bool>, Query, description = "Wenn true, werden inaktive Fahrzeuge mitgeliefert (default: false)")
+    ),
+    responses(
+        (status = 200, description = "Fahrzeuge des Fahrers", body = CarsList),
+        (status = 401, description = "Authentifizierung fehlgeschlagen")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn list_my_cars(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Query(query): Query<ListCarsQuery>,
+) -> Result<Json<CarsList>, ApiError> {
+    let cars = state
+        .list_my_cars
+        .execute(claims.personalnummer, query.include_inactive)
+        .await?;
+    Ok(Json(CarsList { cars }))
+}
+
+/// Legt ein neues Fahrzeug für den angemeldeten Fahrer an.
+#[utoipa::path(
+    post,
+    path = "/me/cars",
+    tag = "cars",
+    request_body = CreateCarRequest,
+    responses(
+        (status = 200, description = "Fahrzeug angelegt", body = CarResponse),
+        (status = 400, description = "Validierungsfehler (z. B. doppeltes Kennzeichen)"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn create_my_car(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Json(req): Json<CreateCarRequest>,
+) -> Result<Json<CarResponse>, ApiError> {
+    let car = state
+        .create_my_car
+        .execute(claims.personalnummer, req)
+        .await?;
+    Ok(Json(CarResponse { car }))
+}
+
+/// Aktualisiert ein Fahrzeug (Kennzeichen ändern / deaktivieren).
+#[utoipa::path(
+    patch,
+    path = "/me/cars/{car_id}",
+    tag = "cars",
+    params(("car_id" = Uuid, Path)),
+    request_body = UpdateCarRequest,
+    responses(
+        (status = 200, description = "Fahrzeug aktualisiert", body = CarResponse),
+        (status = 400, description = "Validierungsfehler"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Fahrzeug nicht gefunden oder gehört nicht zu diesem Account")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn update_my_car(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(car_id): Path<Uuid>,
+    Json(req): Json<UpdateCarRequest>,
+) -> Result<Json<CarResponse>, ApiError> {
+    let car = state
+        .update_my_car
+        .execute(car_id, claims.personalnummer, req)
+        .await?;
+    Ok(Json(CarResponse { car }))
+}
--- a/crates/api/src/routes/deliveries.rs
+++ b/crates/api/src/routes/deliveries.rs
@ -0,0 +1,207 @@
+use axum::Json;
+use axum::Router;
+use axum::extract::{Path, State};
+use axum::routing::{post, put};
+use holzleitner_application::dto::{
+    AssignCarRequest, CancelDeliveryRequest, CreateDeliveryNoteRequest, DeliveryNoteResponse,
+    DeliveryResponse, HoldDeliveryRequest,
+};
+use holzleitner_application::ports::DeliveryAction;
+use uuid::Uuid;
+
+use crate::error::ApiError;
+use crate::extractors::AuthenticatedUser;
+use crate::state::AppState;
+
+pub fn router() -> Router<AppState> {
+    Router::new()
+        .route("/deliveries/{delivery_id}/hold", post(hold))
+        .route("/deliveries/{delivery_id}/resume", post(resume))
+        .route("/deliveries/{delivery_id}/cancel", post(cancel))
+        .route("/deliveries/{delivery_id}/complete", post(complete))
+        .route("/deliveries/{delivery_id}/notes", post(create_note))
+        .route("/deliveries/{delivery_id}/assigned-car", put(assign_car))
+}
+
+/// Setzt die Lieferung auf `held`. Nur aus `active` zulässig.
+#[utoipa::path(
+    post,
+    path = "/deliveries/{delivery_id}/hold",
+    tag = "deliveries",
+    params(("delivery_id" = Uuid, Path)),
+    request_body = HoldDeliveryRequest,
+    responses(
+        (status = 200, description = "Lieferung geholdet", body = DeliveryResponse),
+        (status = 400, description = "Invalider Statusübergang oder leerer Reason"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Lieferung nicht gefunden")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn hold(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(delivery_id): Path<Uuid>,
+    Json(req): Json<HoldDeliveryRequest>,
+) -> Result<Json<DeliveryResponse>, ApiError> {
+    tracing::info!(actor = claims.personalnummer, %delivery_id, "delivery.hold");
+    let delivery = state
+        .apply_delivery_action
+        .execute(delivery_id, DeliveryAction::Hold { reason: req.reason })
+        .await?;
+    Ok(Json(DeliveryResponse { delivery }))
+}
+
+/// Setzt die Lieferung zurück auf `active`. Nur aus `held` zulässig.
+#[utoipa::path(
+    post,
+    path = "/deliveries/{delivery_id}/resume",
+    tag = "deliveries",
+    params(("delivery_id" = Uuid, Path)),
+    responses(
+        (status = 200, description = "Lieferung wieder aktiv", body = DeliveryResponse),
+        (status = 400, description = "Invalider Statusübergang"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Lieferung nicht gefunden")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn resume(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(delivery_id): Path<Uuid>,
+) -> Result<Json<DeliveryResponse>, ApiError> {
+    tracing::info!(actor = claims.personalnummer, %delivery_id, "delivery.resume");
+    let delivery = state
+        .apply_delivery_action
+        .execute(delivery_id, DeliveryAction::Resume)
+        .await?;
+    Ok(Json(DeliveryResponse { delivery }))
+}
+
+/// Setzt die Lieferung auf `canceled` — endgültig. Erlaubt aus
+/// `active` und `held`.
+#[utoipa::path(
+    post,
+    path = "/deliveries/{delivery_id}/cancel",
+    tag = "deliveries",
+    params(("delivery_id" = Uuid, Path)),
+    request_body = CancelDeliveryRequest,
+    responses(
+        (status = 200, description = "Lieferung storniert", body = DeliveryResponse),
+        (status = 400, description = "Invalider Statusübergang oder leerer Reason"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Lieferung nicht gefunden")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn cancel(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(delivery_id): Path<Uuid>,
+    Json(req): Json<CancelDeliveryRequest>,
+) -> Result<Json<DeliveryResponse>, ApiError> {
+    tracing::info!(actor = claims.personalnummer, %delivery_id, "delivery.cancel");
+    let delivery = state
+        .apply_delivery_action
+        .execute(
+            delivery_id,
+            DeliveryAction::Cancel { reason: req.reason },
+        )
+        .await?;
+    Ok(Json(DeliveryResponse { delivery }))
+}
+
+/// Schließt die Lieferung ab — `state = completed`. Nur aus `active`.
+#[utoipa::path(
+    post,
+    path = "/deliveries/{delivery_id}/complete",
+    tag = "deliveries",
+    params(("delivery_id" = Uuid, Path)),
+    responses(
+        (status = 200, description = "Lieferung abgeschlossen", body = DeliveryResponse),
+        (status = 400, description = "Invalider Statusübergang"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Lieferung nicht gefunden")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn complete(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(delivery_id): Path<Uuid>,
+) -> Result<Json<DeliveryResponse>, ApiError> {
+    tracing::info!(actor = claims.personalnummer, %delivery_id, "delivery.complete");
+    let delivery = state
+        .apply_delivery_action
+        .execute(delivery_id, DeliveryAction::Complete)
+        .await?;
+    Ok(Json(DeliveryResponse { delivery }))
+}
+
+/// Legt eine neue Notiz an einer Lieferung an. Mindestens eines von
+/// `text` und `imageAttachment` muss inhaltlich gefüllt sein
+/// (Leerstrings werden serverseitig getrimmt und als leer behandelt).
+#[utoipa::path(
+    post,
+    path = "/deliveries/{delivery_id}/notes",
+    tag = "deliveries",
+    params(("delivery_id" = Uuid, Path)),
+    request_body = CreateDeliveryNoteRequest,
+    responses(
+        (status = 200, description = "Notiz angelegt", body = DeliveryNoteResponse),
+        (status = 400, description = "Notiz ohne Inhalt"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Lieferung nicht gefunden")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn create_note(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(delivery_id): Path<Uuid>,
+    Json(req): Json<CreateDeliveryNoteRequest>,
+) -> Result<Json<DeliveryNoteResponse>, ApiError> {
+    tracing::info!(actor = claims.personalnummer, %delivery_id, "delivery.create_note");
+    let note = state
+        .create_delivery_note
+        .execute(delivery_id, claims.personalnummer, req)
+        .await?;
+    Ok(Json(DeliveryNoteResponse { note }))
+}
+
+/// Setzt das `assigned_car_id` einer Lieferung. `carId: null` löst
+/// die Zuordnung wieder. Der Use Case stellt sicher, dass das Fahrzeug
+/// zum angemeldeten Account gehört.
+#[utoipa::path(
+    put,
+    path = "/deliveries/{delivery_id}/assigned-car",
+    tag = "deliveries",
+    params(("delivery_id" = Uuid, Path)),
+    request_body = AssignCarRequest,
+    responses(
+        (status = 200, description = "Fahrzeug zugewiesen / entfernt", body = DeliveryResponse),
+        (status = 400, description = "Fahrzeug gehört nicht zum Account"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Lieferung nicht gefunden")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn assign_car(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(delivery_id): Path<Uuid>,
+    Json(req): Json<AssignCarRequest>,
+) -> Result<Json<DeliveryResponse>, ApiError> {
+    tracing::info!(
+        actor = claims.personalnummer,
+        %delivery_id,
+        car_id = ?req.car_id,
+        "delivery.assign_car",
+    );
+    let delivery = state
+        .assign_car_to_delivery
+        .execute(delivery_id, claims.personalnummer, req.car_id)
+        .await?;
+    Ok(Json(DeliveryResponse { delivery }))
+}
--- a/crates/api/src/routes/health.rs
+++ b/crates/api/src/routes/health.rs
@ -0,0 +1,23 @@
+use axum::Router;
+use axum::routing::get;
+
+use crate::state::AppState;
+
+pub fn router() -> Router<AppState> {
+    Router::new().route("/health", get(health))
+}
+
+/// Health-Endpoint für Load-Balancer und Container-Probes. Bewusst
+/// kein Auth — eine `200 ok`-Antwort darf nicht von der Auth abhängen.
+#[utoipa::path(
+    get,
+    path = "/health",
+    tag = "health",
+    responses(
+        (status = 200, description = "Service ist erreichbar", body = String)
+    ),
+    security()
+)]
+pub async fn health() -> &'static str {
+    "ok"
+}
--- a/crates/api/src/routes/mod.rs
+++ b/crates/api/src/routes/mod.rs
@ -0,0 +1,9 @@
+//! HTTP-Routen, gruppiert nach Domäne. Wird vom `main.rs`-Router
+//! zusammengesetzt.
+
+pub mod accounts;
+pub mod cars;
+pub mod deliveries;
+pub mod health;
+pub mod scans;
+pub mod tours;
--- a/crates/api/src/routes/scans.rs
+++ b/crates/api/src/routes/scans.rs
@ -0,0 +1,49 @@
+use axum::Json;
+use axum::Router;
+use axum::extract::State;
+use axum::routing::post;
+use holzleitner_application::dto::{ApplyScansRequest, ApplyScansResponse};
+
+use crate::error::ApiError;
+use crate::extractors::AuthenticatedUser;
+use crate::state::AppState;
+
+pub fn router() -> Router<AppState> {
+    Router::new().route("/scans", post(apply_scans))
+}
+
+/// Wendet eine Liste von Scan-Events idempotent an.
+///
+/// Pro Event ein eigenes Resultat. Status `applied` schreibt einen
+/// frischen Audit-Eintrag, `duplicate` liefert den aktuellen Stand am
+/// Server, `rejected` enthält die Begründung. Reihenfolge der `results`
+/// entspricht der Reihenfolge der `scans` im Request.
+#[utoipa::path(
+    post,
+    path = "/scans",
+    tag = "scans",
+    request_body = ApplyScansRequest,
+    responses(
+        (status = 200, description = "Bulk-Ergebnis pro Event", body = ApplyScansResponse),
+        (status = 401, description = "Authentifizierung fehlgeschlagen")
+    ),
+    security(
+        ("bearer_auth" = [])
+    )
+)]
+pub async fn apply_scans(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Json(request): Json<ApplyScansRequest>,
+) -> Result<Json<ApplyScansResponse>, ApiError> {
+    tracing::info!(
+        actor = claims.personalnummer,
+        count = request.scans.len(),
+        "apply_scans",
+    );
+    let response = state
+        .apply_scans
+        .execute(request, claims.personalnummer)
+        .await?;
+    Ok(Json(response))
+}
--- a/crates/api/src/routes/tours.rs
+++ b/crates/api/src/routes/tours.rs
@ -0,0 +1,158 @@
+use axum::Json;
+use axum::Router;
+use axum::extract::{Path, State};
+use axum::routing::{get, post, put};
+use holzleitner_application::dto::{
+    SetDeliveryOrderRequest, SetDeliveryOrderResponse, SyncTourRequest, TourDetails, TourSummary,
+};
+use serde::Serialize;
+use uuid::Uuid;
+
+use crate::error::ApiError;
+use crate::extractors::AuthenticatedUser;
+use crate::state::AppState;
+
+pub fn router() -> Router<AppState> {
+    Router::new()
+        .route("/me/tours/today", get(list_my_tours_today))
+        .route("/tours/{tour_id}", get(get_tour))
+        .route("/tours/{tour_id}/delivery-order", put(set_delivery_order))
+        .route("/sync/tour", post(sync_tour))
+}
+
+/// Antwort-Hülle für `GET /me/tours/today`. Eigenes Struct, weil
+/// utoipa für `Vec<T>` als Top-Level-Response keinen sauberen
+/// Schemanamen vergibt — und ein Wrapper macht die Erweiterbarkeit
+/// (z. B. Paginierung in Zukunft) zur Nicht-Breaking-Change.
+#[derive(Debug, Serialize, utoipa::ToSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct TourSummaryList {
+    pub tours: Vec<TourSummary>,
+}
+
+/// Antwort-Hülle für `POST /sync/tour`.
+#[derive(Debug, Serialize, utoipa::ToSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct SyncTourResponse {
+    pub tour_id: Uuid,
+}
+
+/// Listet heutige Touren des angemeldeten Fahrers (Filter aus dem JWT).
+#[utoipa::path(
+    get,
+    path = "/me/tours/today",
+    tag = "tours",
+    responses(
+        (status = 200, description = "Liste der heutigen Touren", body = TourSummaryList),
+        (status = 401, description = "Authentifizierung fehlgeschlagen")
+    ),
+    security(
+        ("bearer_auth" = [])
+    )
+)]
+pub async fn list_my_tours_today(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+) -> Result<Json<TourSummaryList>, ApiError> {
+    tracing::debug!(personalnummer = claims.personalnummer, "list_my_tours_today");
+    let tours = state
+        .list_my_tours_today
+        .execute(claims.personalnummer)
+        .await?;
+    Ok(Json(TourSummaryList { tours }))
+}
+
+/// Lädt eine Tour mit allen Lieferungen, Positionen und referenzierten
+/// Stammdaten — die App nutzt das als einzigen großen Read.
+#[utoipa::path(
+    get,
+    path = "/tours/{tour_id}",
+    tag = "tours",
+    params(
+        ("tour_id" = Uuid, Path, description = "Eindeutige Tour-Id (UUID)")
+    ),
+    responses(
+        (status = 200, description = "Tour-Aggregat gefunden", body = TourDetails),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Keine Tour mit dieser Id")
+    ),
+    security(
+        ("bearer_auth" = [])
+    )
+)]
+pub async fn get_tour(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(tour_id): Path<Uuid>,
+) -> Result<Json<TourDetails>, ApiError> {
+    tracing::debug!(personalnummer = claims.personalnummer, %tour_id, "get_tour");
+    let details = state.get_tour.execute(tour_id).await?;
+    Ok(Json(details))
+}
+
+/// Schreibt die Sortier-Reihenfolge aller Lieferungen einer Tour neu.
+/// Der Client schickt die **vollständige** neue Reihenfolge; fehlende
+/// oder fremde Lieferungs-Ids werden mit `400 validation` abgelehnt.
+#[utoipa::path(
+    put,
+    path = "/tours/{tour_id}/delivery-order",
+    tag = "tours",
+    params(("tour_id" = Uuid, Path)),
+    request_body = SetDeliveryOrderRequest,
+    responses(
+        (status = 200, description = "Neue Reihenfolge gespeichert", body = SetDeliveryOrderResponse),
+        (status = 400, description = "Mengen-Mismatch oder Duplikate"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen"),
+        (status = 404, description = "Tour nicht gefunden")
+    ),
+    security(("bearer_auth" = []))
+)]
+pub async fn set_delivery_order(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Path(tour_id): Path<Uuid>,
+    Json(request): Json<SetDeliveryOrderRequest>,
+) -> Result<Json<SetDeliveryOrderResponse>, ApiError> {
+    tracing::info!(
+        actor = claims.personalnummer,
+        %tour_id,
+        count = request.delivery_ids.len(),
+        "set_delivery_order",
+    );
+    let response = state.set_delivery_order.execute(tour_id, request).await?;
+    Ok(Json(response))
+}
+
+/// Sync-Endpoint für das ERP: legt eine Tagestour samt Lieferungen und
+/// Positionen idempotent an. Identität pro Tour
+/// `(driver_personalnummer, tour_date)`, pro Lieferung
+/// `(belegart_id, belegnummer)`.
+#[utoipa::path(
+    post,
+    path = "/sync/tour",
+    tag = "sync",
+    request_body = SyncTourRequest,
+    responses(
+        (status = 200, description = "Tour gespeichert", body = SyncTourResponse),
+        (status = 400, description = "Validierungsfehler im Sync-Payload"),
+        (status = 401, description = "Authentifizierung fehlgeschlagen")
+    ),
+    security(
+        ("bearer_auth" = [])
+    )
+)]
+pub async fn sync_tour(
+    State(state): State<AppState>,
+    AuthenticatedUser(claims): AuthenticatedUser,
+    Json(request): Json<SyncTourRequest>,
+) -> Result<Json<SyncTourResponse>, ApiError> {
+    tracing::info!(
+        caller = claims.personalnummer,
+        driver = request.driver_personalnummer,
+        date = %request.tour_date,
+        deliveries = request.deliveries.len(),
+        "sync_tour",
+    );
+    let tour_id = state.sync_tour.execute(request).await?;
+    Ok(Json(SyncTourResponse { tour_id }))
+}
--- a/crates/api/src/state.rs
+++ b/crates/api/src/state.rs
@ -0,0 +1,33 @@
+use std::sync::Arc;
+
+use holzleitner_application::ports::AuthService;
+use holzleitner_application::usecases::{
+    ApplyDeliveryActionUseCase, ApplyScansUseCase, AssignCarToDeliveryUseCase,
+    CreateDeliveryNoteUseCase, CreateMyCarUseCase, GetAccountUseCase, GetTourUseCase,
+    ListMyCarsUseCase, ListMyToursTodayUseCase, SetDeliveryOrderUseCase, SyncTourUseCase,
+    UpdateMyCarUseCase,
+};
+
+/// Shared application state, der per Axum's `State`-Extractor in alle
+/// Handler hineingegeben wird. Use Cases und Services liegen hinter
+/// `Arc`, damit `Clone` billig ist und Requests sich keine Locks teilen.
+///
+/// Das `AppState`-Klon wird zudem in die JWT-Middleware geschleust
+/// (`from_fn_with_state`), die den `auth_service` nutzt — derselbe
+/// Trait-Objekt-Arc wie die Handler.
+#[derive(Clone)]
+pub struct AppState {
+    pub get_account: Arc<GetAccountUseCase>,
+    pub get_tour: Arc<GetTourUseCase>,
+    pub list_my_tours_today: Arc<ListMyToursTodayUseCase>,
+    pub sync_tour: Arc<SyncTourUseCase>,
+    pub set_delivery_order: Arc<SetDeliveryOrderUseCase>,
+    pub apply_scans: Arc<ApplyScansUseCase>,
+    pub apply_delivery_action: Arc<ApplyDeliveryActionUseCase>,
+    pub create_delivery_note: Arc<CreateDeliveryNoteUseCase>,
+    pub list_my_cars: Arc<ListMyCarsUseCase>,
+    pub create_my_car: Arc<CreateMyCarUseCase>,
+    pub update_my_car: Arc<UpdateMyCarUseCase>,
+    pub assign_car_to_delivery: Arc<AssignCarToDeliveryUseCase>,
+    pub auth_service: Arc<dyn AuthService>,
+}
--- a/crates/application/Cargo.toml
+++ b/crates/application/Cargo.toml
@ -0,0 +1,20 @@
+[package]
+name = "holzleitner-application"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+
+[features]
+# Aktiviert utoipa::ToSchema-Derives auf DTOs + propagiert das Feature in
+# das Domain-Crate, damit Antwort-Schemata vollständig generiert werden.
+openapi = ["dep:utoipa", "holzleitner-domain/openapi"]
+
+[dependencies]
+holzleitner-domain.workspace = true
+serde.workspace = true
+async-trait.workspace = true
+thiserror.workspace = true
+uuid.workspace = true
+chrono.workspace = true
+utoipa = { workspace = true, optional = true }
--- a/crates/application/src/dto/car.rs
+++ b/crates/application/src/dto/car.rs
@ -0,0 +1,50 @@
+//! Request- und Antwort-Typen für die Cars-Endpoints.
+//!
+//! Alle Cars-Endpoints sind aus Sicht des angemeldeten Fahrers ("/me/...").
+//! Der Account-Bezug kommt aus dem JWT, nicht aus dem Body.
+
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use holzleitner_domain::Car;
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct CreateCarRequest {
+    pub plate: String,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct UpdateCarRequest {
+    /// Wenn gesetzt: neues Kennzeichen.
+    pub plate: Option<String>,
+    /// Wenn gesetzt: aktiv/inaktiv. Inaktive Fahrzeuge tauchen in
+    /// `GET /me/cars?activeOnly=true` (default) nicht auf.
+    pub active: Option<bool>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct CarResponse {
+    pub car: Car,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct CarsList {
+    pub cars: Vec<Car>,
+}
+
+/// Setzt das `assigned_car_id` einer Lieferung. `None` (`carId: null`)
+/// entfernt die Zuordnung.
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct AssignCarRequest {
+    pub car_id: Option<Uuid>,
+}
--- a/crates/application/src/dto/delivery_action.rs
+++ b/crates/application/src/dto/delivery_action.rs
@ -0,0 +1,33 @@
+//! Eingaben und Antwort für die vier Delivery-Lifecycle-Endpunkte.
+//!
+//! Pro Endpoint genau ein eigener Request-Typ:
+//! * Hold + Cancel brauchen einen Pflicht-Reason.
+//! * Resume + Complete sind body-frei (App schickt leeres `{}`).
+//!
+//! Die Antwort liefert immer die frisch aktualisierte `Delivery` zurück,
+//! damit die App ihre lokale Sicht in einem Schritt synchron halten kann.
+
+use serde::{Deserialize, Serialize};
+
+use holzleitner_domain::Delivery;
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct HoldDeliveryRequest {
+    pub reason: String,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct CancelDeliveryRequest {
+    pub reason: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct DeliveryResponse {
+    pub delivery: Delivery,
+}
--- a/crates/application/src/dto/delivery_order.rs
+++ b/crates/application/src/dto/delivery_order.rs
@ -0,0 +1,35 @@
+//! Request/Response für `PUT /tours/{id}/delivery-order`.
+//!
+//! Der Client schickt **die vollständige neue Reihenfolge** aller
+//! Lieferungen der Tour. Der Server validiert, dass die Menge der Ids
+//! exakt zur Tour passt — fehlende oder fremde Ids werden hart abgelehnt.
+//! Damit kann ein Client mit veralteten Daten nicht versehentlich
+//! Lieferungen "verlieren".
+
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct SetDeliveryOrderRequest {
+    /// Reihenfolge: Position im Array (0-basiert) wird zu `sort_order`
+    /// (1-basiert) gemappt.
+    pub delivery_ids: Vec<Uuid>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct SetDeliveryOrderResponse {
+    pub tour_id: Uuid,
+    pub order: Vec<DeliveryOrderEntry>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct DeliveryOrderEntry {
+    pub delivery_id: Uuid,
+    pub sort_order: i32,
+}
--- a/crates/application/src/dto/mod.rs
+++ b/crates/application/src/dto/mod.rs
@ -0,0 +1,35 @@
+//! Data Transfer Objects der Application-Schicht.
+//!
+//! DTOs aggregieren Domänenobjekte zu **Use-Case-Antworten** und
+//! beschreiben die Eingaben für Sync-Operationen. Sie bleiben bewusst
+//! im Application-Layer (nicht im Domain-Layer), weil sie eine
+//! Use-Case-Sicht auf die Daten sind, kein Stück Geschäftslogik —
+//! ein anderer Use-Case darf eine andere Projektion liefern.
+//!
+//! Serde- und (optional) utoipa-Annotationen erlauben, dieselbe
+//! Struktur direkt als HTTP-Antwort zu serialisieren — das spart eine
+//! zweite Schicht handgeschriebener API-DTOs.
+
+pub mod car;
+pub mod delivery_action;
+pub mod delivery_order;
+pub mod note;
+pub mod scan;
+pub mod tour_details;
+pub mod tour_summary;
+pub mod tour_sync;
+
+pub use car::{
+    AssignCarRequest, CarResponse, CarsList, CreateCarRequest, UpdateCarRequest,
+};
+pub use delivery_action::{CancelDeliveryRequest, DeliveryResponse, HoldDeliveryRequest};
+pub use delivery_order::{
+    DeliveryOrderEntry, SetDeliveryOrderRequest, SetDeliveryOrderResponse,
+};
+pub use note::{CreateDeliveryNoteRequest, DeliveryNoteResponse};
+pub use scan::{
+    ApplyScansRequest, ApplyScansResponse, ScanEvent, ScanResult, ScanResultStatus,
+};
+pub use tour_details::{DeliveryWithItems, TourDetails};
+pub use tour_summary::TourSummary;
+pub use tour_sync::{SyncDelivery, SyncDeliveryItem, SyncTourRequest};
--- a/crates/application/src/dto/note.rs
+++ b/crates/application/src/dto/note.rs
@ -0,0 +1,29 @@
+//! Request/Response für `POST /deliveries/{id}/notes`.
+//!
+//! Mindestens eines von `text` und `image_attachment` muss gesetzt
+//! sein — die Constraint wird im Use Case geprüft und steht zusätzlich
+//! als DB-CHECK.
+
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use holzleitner_domain::DeliveryNote;
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct CreateDeliveryNoteRequest {
+    pub text: Option<String>,
+    /// Object-Storage-Key oder URL eines vorab hochgeladenen Bildes.
+    pub image_attachment: Option<String>,
+    /// Fahrzeug, das die Notiz erzeugt hat. Muss zum angemeldeten
+    /// Account gehören. `None` ist erlaubt.
+    pub author_car_id: Option<Uuid>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct DeliveryNoteResponse {
+    pub note: DeliveryNote,
+}
--- a/crates/application/src/dto/scan.rs
+++ b/crates/application/src/dto/scan.rs
@ -0,0 +1,73 @@
+//! Bulk-Scan-Endpoint: Request, Response, pro-Event-Result.
+//!
+//! Idempotenz läuft über `client_scan_id`: ein UUID, das die App pro
+//! erzeugtem Scan-Event genau einmal vergibt. Retry desselben Events
+//! liefert `Duplicate` zurück. Pro Event ein eigener kleiner Vorgang —
+//! ein einzelner Reject blockiert die anderen nicht.
+
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use holzleitner_domain::{AuditAction, ScanState};
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct ApplyScansRequest {
+    pub scans: Vec<ScanEvent>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct ScanEvent {
+    pub client_scan_id: Uuid,
+    pub delivery_item_id: Uuid,
+    pub action: AuditAction,
+    /// Pflicht bei `Hold` und `Remove`. Sonst ignoriert.
+    pub reason: Option<String>,
+    pub client_scanned_at: DateTime<Utc>,
+    /// Fahrzeug, in dem der Scan gemacht wurde. Muss zum
+    /// angemeldeten Account gehören. `None` ist erlaubt, schwächt
+    /// aber den Audit-Trail.
+    pub actor_car_id: Option<Uuid>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct ApplyScansResponse {
+    pub results: Vec<ScanResult>,
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "snake_case")]
+pub enum ScanResultStatus {
+    /// Aktion wurde frisch angewendet; Audit-Eintrag geschrieben.
+    Applied,
+    /// `client_scan_id` war bereits bekannt. Item-State unverändert,
+    /// `scan_state` zeigt den aktuellen Stand am Server.
+    Duplicate,
+    /// Aktion wurde abgelehnt (z. B. unbekanntes Item, invalider
+    /// Statusübergang, fehlender Pflicht-Reason). `reason` füllt die
+    /// Begründung; `scan_state` ist `None`.
+    Rejected,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct ScanResult {
+    pub client_scan_id: Uuid,
+    pub status: ScanResultStatus,
+    /// Bei `Rejected`: Begründung. Bei `Applied`/`Duplicate`: `None`.
+    pub reason: Option<String>,
+    /// Aktueller `scan_state` der Position nach der Verarbeitung —
+    /// genau dann gesetzt, wenn der Server den Stand kennen konnte
+    /// (`Applied` oder `Duplicate`). Erlaubt der App, die UI ohne
+    /// Re-Fetch zu aktualisieren.
+    pub delivery_item_id: Option<Uuid>,
+    pub new_scan_state: Option<ScanState>,
+}
--- a/crates/application/src/dto/tour_details.rs
+++ b/crates/application/src/dto/tour_details.rs
@ -0,0 +1,41 @@
+//! Aggregat-Antwort für `GET /tours/{id}`.
+//!
+//! Vereint Tour, alle ihre Lieferungen mit Positionen sowie die
+//! referenzierten Stammdaten (Kunden, Artikel, Lager) in einem
+//! Payload. Die Stammdaten werden als deduplizierte Lookup-Listen
+//! mitgeliefert — die App joint clientseitig per Id. Das spart
+//! gegenüber vollständig denormalisierten Items spürbar Payload,
+//! wenn die gleichen Artikel/Lager mehrfach vorkommen.
+
+use serde::Serialize;
+
+use holzleitner_domain::{
+    Article, Customer, CustomerContact, Delivery, DeliveryItem, DeliveryNote, Tour, Warehouse,
+};
+
+#[derive(Debug, Clone, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct TourDetails {
+    pub tour: Tour,
+    pub deliveries: Vec<DeliveryWithItems>,
+    pub customers: Vec<Customer>,
+    pub customer_contacts: Vec<CustomerContact>,
+    pub articles: Vec<Article>,
+    pub warehouses: Vec<Warehouse>,
+    /// Alle Notizen aller Lieferungen dieser Tour, in einer Liste.
+    /// Die App joint clientseitig per `delivery_id`. Reihenfolge:
+    /// pro Lieferung aufsteigend nach `created_at`.
+    pub notes: Vec<DeliveryNote>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct DeliveryWithItems {
+    #[serde(flatten)]
+    pub delivery: Delivery,
+    /// Sortier-Reihenfolge innerhalb der Tour (1-basiert).
+    pub sort_order: i32,
+    pub items: Vec<DeliveryItem>,
+}
--- a/crates/application/src/dto/tour_summary.rs
+++ b/crates/application/src/dto/tour_summary.rs
@ -0,0 +1,17 @@
+//! Liste-Antwort für `GET /me/tours/today` — leichtgewichtig, ohne
+//! Lieferpositionen. Die App nutzt diese Liste für die
+//! Fahrzeug/Tour-Auswahl-Page und lädt erst nach der Auswahl die
+//! vollständige Tour über `GET /tours/{id}`.
+
+use chrono::NaiveDate;
+use serde::Serialize;
+use uuid::Uuid;
+
+#[derive(Debug, Clone, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct TourSummary {
+    pub tour_id: Uuid,
+    pub tour_date: NaiveDate,
+    pub delivery_count: i64,
+}
--- a/crates/application/src/dto/tour_sync.rs
+++ b/crates/application/src/dto/tour_sync.rs
@ -0,0 +1,68 @@
+//! Request-Body für `POST /sync/tour`.
+//!
+//! Diese Struktur ist die Kontaktfläche zum ERP. Sie beschreibt eine
+//! Tagestour eines Fahrers inklusive aller Lieferungen und Positionen.
+//! Identität:
+//! * Tour: `(driver_personalnummer, tour_date)` — Upsert.
+//! * Delivery: `(belegart_id, belegnummer)` — Upsert.
+//! * DeliveryItem: `(delivery, belegzeilen_nr, komponenten_artikel_nr)`.
+//!
+//! Bewusst keine UUIDs vom Sender erwartet — die ERP-Welt arbeitet mit
+//! ihren eigenen business-stabilen Keys, wir generieren UUIDs intern.
+
+use chrono::NaiveDate;
+use serde::{Deserialize, Serialize};
+
+use holzleitner_domain::Address;
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct SyncTourRequest {
+    pub driver_personalnummer: i64,
+    pub tour_date: NaiveDate,
+    pub deliveries: Vec<SyncDelivery>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct SyncDelivery {
+    pub belegart_id: i64,
+    pub belegnummer: String,
+
+    pub erp_customer_id: i64,
+    pub customer_name: String,
+    pub customer_address: Address,
+
+    /// Snapshot der Lieferadresse (kann von der Stammadresse abweichen).
+    pub delivery_address: Address,
+
+    /// 1-basiert, definiert die initiale Reihenfolge in der App.
+    pub sort_order: i32,
+
+    pub desired_time: Option<String>,
+    pub special_agreements: Option<String>,
+
+    pub items: Vec<SyncDeliveryItem>,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct SyncDeliveryItem {
+    pub belegzeilen_nr: i32,
+    /// Komponenten-Artikelnummer bei aufgelösten Stücklisten, sonst leer.
+    pub komponenten_artikel_nr: Option<String>,
+
+    pub article_number: String,
+    pub article_name: String,
+    /// Default-Lager-Code für den Artikel (Anlage neuer Artikel).
+    pub article_default_warehouse_code: Option<String>,
+    pub article_scannable: bool,
+
+    pub warehouse_code: String,
+    pub warehouse_name: String,
+
+    pub required_quantity: i32,
+}
--- a/crates/application/src/error.rs
+++ b/crates/application/src/error.rs
@ -0,0 +1,31 @@
+use thiserror::Error;
+
+/// Fehler-Hierarchie der Application-Schicht.
+///
+/// Use Cases geben diesen Typ zurück. Die API-Schicht mappt ihn auf
+/// HTTP-Statuscodes (`NotFound` → 404, `Unauthorized` → 401, …),
+/// Persistence-Adapter mappen ihre konkreten Fehler nach
+/// `Repository(...)` hinein.
+#[derive(Debug, Error)]
+pub enum ApplicationError {
+    #[error("not found")]
+    NotFound,
+
+    #[error("unauthorized")]
+    Unauthorized,
+
+    #[error("forbidden")]
+    Forbidden,
+
+    #[error("validation: {0}")]
+    Validation(String),
+
+    #[error("repository: {0}")]
+    Repository(String),
+
+    #[error("external service: {0}")]
+    External(String),
+
+    #[error("unexpected: {0}")]
+    Unexpected(String),
+}
--- a/crates/application/src/lib.rs
+++ b/crates/application/src/lib.rs
@ -0,0 +1,17 @@
+//! Application Layer — Use Cases und Ports.
+//!
+//! Diese Crate kennt das [`holzleitner_domain`]-Modell und definiert
+//! gegen welche **Ports** (Repository-Traits, Service-Traits) die Use
+//! Cases programmieren. Konkrete Implementierungen leben in
+//! `holzleitner-infrastructure` (Postgres, Keycloak, …).
+//!
+//! Diese Crate hat bewusst **keine** Abhängigkeit auf eine konkrete
+//! Datenbank, ein HTTP-Framework oder einen Auth-Provider — sie soll
+//! testbar und framework-unabhängig bleiben.
+
+pub mod dto;
+pub mod error;
+pub mod ports;
+pub mod usecases;
+
+pub use error::ApplicationError;
--- a/crates/application/src/ports/account_repository.rs
+++ b/crates/application/src/ports/account_repository.rs
@ -0,0 +1,17 @@
+use async_trait::async_trait;
+use holzleitner_domain::Account;
+
+use crate::error::ApplicationError;
+
+/// Repository für [`Account`]-Lesezugriffe. Schreibzugriffe folgen
+/// später, sobald sie fachlich gebraucht werden (Accounts werden in der
+/// Regel aus dem ERP gespiegelt, nicht durch die App erzeugt).
+#[async_trait]
+pub trait AccountRepository: Send + Sync {
+    /// Liest einen Account anhand seiner Personalnummer.
+    /// Liefert `None`, wenn kein Datensatz existiert.
+    async fn find_by_personalnummer(
+        &self,
+        personalnummer: i64,
+    ) -> Result<Option<Account>, ApplicationError>;
+}
--- a/crates/application/src/ports/auth_service.rs
+++ b/crates/application/src/ports/auth_service.rs
@ -0,0 +1,80 @@
+use async_trait::async_trait;
+use chrono::{DateTime, Utc};
+use thiserror::Error;
+
+use crate::error::ApplicationError;
+
+/// Verifizierte Claims eines OAuth2/OIDC-Access-Tokens.
+///
+/// Bewusst sparsam — nur das, was die Anwendung wirklich braucht.
+/// Identität und Autorisierung leiten sich aus `personalnummer` +
+/// `roles` ab; `subject` ist die Keycloak-User-UUID für Audit-/Log-
+/// Zwecke.
+#[derive(Debug, Clone)]
+pub struct Claims {
+    /// Personalnummer aus dem Custom-Claim (User-Attribut). Identifiziert
+    /// den Account in unserer Welt (siehe [`holzleitner_domain::Account`]).
+    pub personalnummer: i64,
+
+    /// Keycloak-User-UUID (`sub`). Stabil, opak — eignet sich für Logs,
+    /// nicht für fachliche Aussagen.
+    pub subject: String,
+
+    /// Realm-Rollen (z. B. `driver`). Quelle für RBAC-Checks in Use Cases.
+    pub roles: Vec<String>,
+
+    /// Ablaufzeitpunkt aus `exp`. Nur informativ — die Signatur-Validierung
+    /// im Adapter prüft das bereits.
+    pub expires_at: DateTime<Utc>,
+}
+
+impl Claims {
+    /// Convenience-Check, ob der Anwender eine bestimmte Rolle trägt.
+    pub fn has_role(&self, role: &str) -> bool {
+        self.roles.iter().any(|r| r == role)
+    }
+}
+
+/// Fehler des [`AuthService`]. Adapter-spezifische Details bleiben in den
+/// Varianten, die API-Schicht mappt sie pauschal auf 401 (Unauthorized) —
+/// außer `External`, das auf 500/502 mappt.
+#[derive(Debug, Error)]
+pub enum AuthError {
+    #[error("missing bearer token")]
+    MissingToken,
+
+    #[error("token expired")]
+    Expired,
+
+    #[error("invalid token: {0}")]
+    Invalid(String),
+
+    #[error("audience mismatch")]
+    InvalidAudience,
+
+    #[error("missing claim: {0}")]
+    MissingClaim(&'static str),
+
+    /// Auth-Provider nicht erreichbar oder antwortet nicht plausibel.
+    /// Aus Anwendersicht ein 5xx, nicht ein 401.
+    #[error("external auth service: {0}")]
+    External(String),
+}
+
+impl From<AuthError> for ApplicationError {
+    fn from(err: AuthError) -> Self {
+        match err {
+            AuthError::External(msg) => ApplicationError::External(msg),
+            _ => ApplicationError::Unauthorized,
+        }
+    }
+}
+
+/// Verifiziert OAuth2/OIDC-Access-Tokens. Konkrete Implementierung in
+/// `holzleitner-infrastructure` (Keycloak via OIDC-Discovery + JWKS).
+#[async_trait]
+pub trait AuthService: Send + Sync {
+    /// Validiert das übergebene Bearer-Token (ohne `Bearer `-Prefix) und
+    /// gibt die extrahierten Claims zurück.
+    async fn verify_token(&self, bearer_token: &str) -> Result<Claims, AuthError>;
+}
--- a/crates/application/src/ports/car_repository.rs
+++ b/crates/application/src/ports/car_repository.rs
@ -0,0 +1,58 @@
+//! Port für Fahrzeug-Stammdaten.
+//!
+//! Alle Lese- und Schreibzugriffe gehen über `account_id` (=
+//! Personalnummer aus dem JWT). Es gibt **keine** Methode, die
+//! Fahrzeuge ohne Account-Filter zurückgibt — so ist die Isolation
+//! zwischen Subunternehmer-Accounts strukturell garantiert.
+
+use async_trait::async_trait;
+use uuid::Uuid;
+
+use holzleitner_domain::Car;
+
+use crate::error::ApplicationError;
+
+#[async_trait]
+pub trait CarRepository: Send + Sync {
+    /// Liste der Fahrzeuge eines Accounts. `include_inactive = false`
+    /// blendet deaktivierte Fahrzeuge aus (Default für die App).
+    async fn find_by_account(
+        &self,
+        personalnummer: i64,
+        include_inactive: bool,
+    ) -> Result<Vec<Car>, ApplicationError>;
+
+    /// Sucht ein Fahrzeug, das einem Account gehört. `None` wenn es
+    /// das Fahrzeug nicht gibt **oder** zu einem anderen Account
+    /// gehört — beides sieht für den Caller gleich aus, das ist
+    /// gewollt (kein Account-Probing).
+    async fn find_by_id_for_account(
+        &self,
+        car_id: Uuid,
+        personalnummer: i64,
+    ) -> Result<Option<Car>, ApplicationError>;
+
+    async fn create(
+        &self,
+        personalnummer: i64,
+        plate: &str,
+    ) -> Result<Car, ApplicationError>;
+
+    /// Optional-Patch. `None` heißt "unverändert".
+    async fn update(
+        &self,
+        car_id: Uuid,
+        personalnummer: i64,
+        plate: Option<&str>,
+        active: Option<bool>,
+    ) -> Result<Car, ApplicationError>;
+
+    /// Validiert, dass alle übergebenen IDs zum Account gehören. Nutzt
+    /// der Use-Case beim Bulk-Scan, um die `actor_car_id`-Werte
+    /// einmalig vor dem Verarbeiten zu prüfen.
+    async fn assert_owned_by_account(
+        &self,
+        car_ids: &[Uuid],
+        personalnummer: i64,
+    ) -> Result<(), ApplicationError>;
+}
--- a/crates/application/src/ports/delivery_note_repository.rs
+++ b/crates/application/src/ports/delivery_note_repository.rs
@ -0,0 +1,24 @@
+//! Port für Delivery-Notizen.
+//!
+//! Aktuell nur das Anlegen — der Read-Pfad läuft als Teil des Tour-
+//! Aggregats (`TourDetails.notes`). Sollten irgendwann Listen-Reads
+//! oder Updates an einzelnen Notizen nötig werden, kommen die hier rein.
+
+use async_trait::async_trait;
+use uuid::Uuid;
+
+use holzleitner_domain::DeliveryNote;
+
+use crate::error::ApplicationError;
+
+#[async_trait]
+pub trait DeliveryNoteRepository: Send + Sync {
+    async fn create(
+        &self,
+        delivery_id: Uuid,
+        author_personalnummer: i64,
+        author_car_id: Option<Uuid>,
+        text: Option<String>,
+        image_attachment: Option<String>,
+    ) -> Result<DeliveryNote, ApplicationError>;
+}
--- a/crates/application/src/ports/delivery_repository.rs
+++ b/crates/application/src/ports/delivery_repository.rs
@ -0,0 +1,44 @@
+//! Port für Delivery-Lifecycle-Übergänge.
+//!
+//! Eine schmale, aktionsbasierte Schnittstelle: der Use Case übergibt
+//! eine [`DeliveryAction`], die Persistence führt SELECT-FOR-UPDATE,
+//! validiert den Statusübergang und schreibt fort — alles in einer
+//! Transaktion. Liefert die frisch aktualisierte [`Delivery`] zurück,
+//! damit die API direkt antworten kann.
+
+use async_trait::async_trait;
+use uuid::Uuid;
+
+use holzleitner_domain::Delivery;
+
+use crate::error::ApplicationError;
+
+#[derive(Debug, Clone)]
+pub enum DeliveryAction {
+    /// State → `Held`, `state_reason` = `reason`.
+    Hold { reason: String },
+    /// State → `Active`, `state_reason` = `NULL`. Nur aus `Held`.
+    Resume,
+    /// State → `Canceled`, `state_reason` = `reason`. Endgültig.
+    Cancel { reason: String },
+    /// State → `Completed`, `state_reason` = `NULL`. Nur aus `Active`.
+    Complete,
+}
+
+#[async_trait]
+pub trait DeliveryRepository: Send + Sync {
+    async fn apply_action(
+        &self,
+        delivery_id: Uuid,
+        action: DeliveryAction,
+    ) -> Result<Delivery, ApplicationError>;
+
+    /// Setzt das `assigned_car_id` einer Lieferung. `None` löst die
+    /// Zuordnung. Der Use Case muss vorher prüfen, dass das
+    /// Fahrzeug zum angemeldeten Account gehört.
+    async fn assign_car(
+        &self,
+        delivery_id: Uuid,
+        car_id: Option<Uuid>,
+    ) -> Result<Delivery, ApplicationError>;
+}
--- a/crates/application/src/ports/mod.rs
+++ b/crates/application/src/ports/mod.rs
@ -0,0 +1,22 @@
+//! Ports — die Trait-Definitionen, gegen die Use Cases programmieren.
+//!
+//! Hier landen Repository-Traits (z. B. `TourRepository`,
+//! `DeliveryRepository`) sowie Service-Traits (z. B. `AuthService` für
+//! Keycloak). Konkrete Implementierungen leben in
+//! `holzleitner-infrastructure`.
+
+pub mod account_repository;
+pub mod auth_service;
+pub mod car_repository;
+pub mod delivery_note_repository;
+pub mod delivery_repository;
+pub mod scan_repository;
+pub mod tour_repository;
+
+pub use account_repository::AccountRepository;
+pub use auth_service::{AuthError, AuthService, Claims};
+pub use car_repository::CarRepository;
+pub use delivery_note_repository::DeliveryNoteRepository;
+pub use delivery_repository::{DeliveryAction, DeliveryRepository};
+pub use scan_repository::{ApplyScanOutcome, ScanRepository};
+pub use tour_repository::TourRepository;
--- a/crates/application/src/ports/scan_repository.rs
+++ b/crates/application/src/ports/scan_repository.rs
@ -0,0 +1,46 @@
+//! Port für das Anwenden von Scan-Events.
+//!
+//! Bewusst eine schmale Schnittstelle: ein einziger Aufruf
+//! `apply_one` pro Event. Die Bulk-Logik (Iteration, Sammlung der
+//! Ergebnisse) lebt im Use Case — die Persistence kennt nur die
+//! atomare Operation und kann sie isoliert testen.
+//!
+//! `apply_one` MUSS idempotent über `client_scan_id` sein und darf
+//! niemals den `scan_state` ändern, wenn der Audit-Eintrag schon
+//! existiert.
+
+use async_trait::async_trait;
+use uuid::Uuid;
+
+use holzleitner_domain::ScanState;
+
+use crate::dto::ScanEvent;
+use crate::error::ApplicationError;
+
+/// Ergebnis einer einzelnen Scan-Operation aus Sicht der Persistence.
+/// Der Use Case mappt das auf die `ScanResult`-Antwort der API.
+#[derive(Debug, Clone)]
+pub enum ApplyScanOutcome {
+    /// Frisch angewendet — neuer State der Position.
+    Applied {
+        delivery_item_id: Uuid,
+        new_state: ScanState,
+    },
+    /// `client_scan_id` war bereits da. State unverändert, hier der
+    /// aktuelle Stand am Server für die App.
+    Duplicate {
+        delivery_item_id: Uuid,
+        current_state: ScanState,
+    },
+    /// Abgelehnt (unbekanntes Item, invalider Statusübergang, …).
+    Rejected { reason: String },
+}
+
+#[async_trait]
+pub trait ScanRepository: Send + Sync {
+    async fn apply_one(
+        &self,
+        event: &ScanEvent,
+        actor_personalnummer: i64,
+    ) -> Result<ApplyScanOutcome, ApplicationError>;
+}
--- a/crates/application/src/ports/tour_repository.rs
+++ b/crates/application/src/ports/tour_repository.rs
@ -0,0 +1,52 @@
+//! Repository-Port für Touren.
+//!
+//! Drei Operationen, die direkt drei Use Cases bedienen:
+//! * `find_today_for_driver` — leichtgewichtige Liste (Auswahl-Page)
+//! * `find_details_by_id` — fettes Aggregat (Sortier-/Beladen-/Auslieferung)
+//! * `upsert_from_sync` — idempotente Übernahme aus dem ERP
+//!
+//! Das fette Aggregat hängen wir bewusst NICHT an die Sync-Operation,
+//! weil das ERP nicht den aktuellen Scan-Status kennt und nichts darüber
+//! aussagen darf.
+
+use async_trait::async_trait;
+use chrono::NaiveDate;
+use uuid::Uuid;
+
+use crate::dto::{
+    DeliveryOrderEntry, SyncTourRequest, TourDetails, TourSummary,
+};
+use crate::error::ApplicationError;
+
+#[async_trait]
+pub trait TourRepository: Send + Sync {
+    async fn find_today_for_driver(
+        &self,
+        personalnummer: i64,
+        today: NaiveDate,
+    ) -> Result<Vec<TourSummary>, ApplicationError>;
+
+    async fn find_details_by_id(
+        &self,
+        tour_id: Uuid,
+    ) -> Result<Option<TourDetails>, ApplicationError>;
+
+    /// Legt eine Tour samt Lieferungen und Positionen idempotent an
+    /// bzw. aktualisiert sie. Gibt die `tour_id` zurück.
+    async fn upsert_from_sync(
+        &self,
+        request: &SyncTourRequest,
+    ) -> Result<Uuid, ApplicationError>;
+
+    /// Schreibt die `sort_order` aller Lieferungen einer Tour neu.
+    ///
+    /// Validiert in einer Transaktion, dass die übergebene Id-Menge
+    /// **exakt** der aktuellen Lieferungs-Menge der Tour entspricht.
+    /// Fehlende, fremde oder doppelte Ids → `Validation`-Fehler.
+    /// Gibt die finale Reihenfolge zurück.
+    async fn set_delivery_order(
+        &self,
+        tour_id: Uuid,
+        delivery_ids: &[Uuid],
+    ) -> Result<Vec<DeliveryOrderEntry>, ApplicationError>;
+}
--- a/crates/application/src/usecases/apply_delivery_action.rs
+++ b/crates/application/src/usecases/apply_delivery_action.rs
@ -0,0 +1,40 @@
+use std::sync::Arc;
+
+use uuid::Uuid;
+
+use holzleitner_domain::Delivery;
+
+use crate::error::ApplicationError;
+use crate::ports::{DeliveryAction, DeliveryRepository};
+
+/// Vier Lifecycle-Übergänge an einer Lieferung — `Hold`, `Resume`,
+/// `Cancel`, `Complete`. Die Statusmaschine läuft im Repository unter
+/// Lock; dieser Use Case validiert die Begründungs-Pflichten vorab.
+pub struct ApplyDeliveryActionUseCase {
+    repository: Arc<dyn DeliveryRepository>,
+}
+
+impl ApplyDeliveryActionUseCase {
+    pub fn new(repository: Arc<dyn DeliveryRepository>) -> Self {
+        Self { repository }
+    }
+
+    pub async fn execute(
+        &self,
+        delivery_id: Uuid,
+        action: DeliveryAction,
+    ) -> Result<Delivery, ApplicationError> {
+        match &action {
+            DeliveryAction::Hold { reason } | DeliveryAction::Cancel { reason } => {
+                if reason.trim().is_empty() {
+                    return Err(ApplicationError::Validation(
+                        "reason darf nicht leer sein".into(),
+                    ));
+                }
+            }
+            DeliveryAction::Resume | DeliveryAction::Complete => {}
+        }
+
+        self.repository.apply_action(delivery_id, action).await
+    }
+}
--- a/crates/application/src/usecases/apply_scans.rs
+++ b/crates/application/src/usecases/apply_scans.rs
@ -0,0 +1,118 @@
+use std::collections::BTreeSet;
+use std::sync::Arc;
+
+use holzleitner_domain::AuditAction;
+
+use crate::dto::{
+    ApplyScansRequest, ApplyScansResponse, ScanEvent, ScanResult, ScanResultStatus,
+};
+use crate::error::ApplicationError;
+use crate::ports::{ApplyScanOutcome, CarRepository, ScanRepository};
+
+/// Wendet eine Liste von Scan-Events idempotent an.
+///
+/// Pro Event ein eigener Vorgang in der Persistence — ein einzelner
+/// Reject blockiert die anderen nicht. Pflicht-Reasons (`Hold` /
+/// `Remove`) werden hier vorab geprüft, ebenso die Ownership aller
+/// in der Batch enthaltenen `actor_car_id`-Werte.
+pub struct ApplyScansUseCase {
+    repository: Arc<dyn ScanRepository>,
+    cars: Arc<dyn CarRepository>,
+}
+
+impl ApplyScansUseCase {
+    pub fn new(repository: Arc<dyn ScanRepository>, cars: Arc<dyn CarRepository>) -> Self {
+        Self { repository, cars }
+    }
+
+    pub async fn execute(
+        &self,
+        request: ApplyScansRequest,
+        actor_personalnummer: i64,
+    ) -> Result<ApplyScansResponse, ApplicationError> {
+        // Distinct car_ids auf einmal validieren — eine Query statt
+        // pro-Event-Roundtrip.
+        let distinct_cars: BTreeSet<uuid::Uuid> = request
+            .scans
+            .iter()
+            .filter_map(|e| e.actor_car_id)
+            .collect();
+        if !distinct_cars.is_empty() {
+            let ids: Vec<uuid::Uuid> = distinct_cars.into_iter().collect();
+            self.cars
+                .assert_owned_by_account(&ids, actor_personalnummer)
+                .await?;
+        }
+
+        let mut results = Vec::with_capacity(request.scans.len());
+
+        for event in &request.scans {
+            if let Some(reason) = pre_validate(event) {
+                results.push(ScanResult {
+                    client_scan_id: event.client_scan_id,
+                    status: ScanResultStatus::Rejected,
+                    reason: Some(reason),
+                    delivery_item_id: None,
+                    new_scan_state: None,
+                });
+                continue;
+            }
+
+            let outcome = self
+                .repository
+                .apply_one(event, actor_personalnummer)
+                .await?;
+
+            results.push(match outcome {
+                ApplyScanOutcome::Applied {
+                    delivery_item_id,
+                    new_state,
+                } => ScanResult {
+                    client_scan_id: event.client_scan_id,
+                    status: ScanResultStatus::Applied,
+                    reason: None,
+                    delivery_item_id: Some(delivery_item_id),
+                    new_scan_state: Some(new_state),
+                },
+                ApplyScanOutcome::Duplicate {
+                    delivery_item_id,
+                    current_state,
+                } => ScanResult {
+                    client_scan_id: event.client_scan_id,
+                    status: ScanResultStatus::Duplicate,
+                    reason: None,
+                    delivery_item_id: Some(delivery_item_id),
+                    new_scan_state: Some(current_state),
+                },
+                ApplyScanOutcome::Rejected { reason } => ScanResult {
+                    client_scan_id: event.client_scan_id,
+                    status: ScanResultStatus::Rejected,
+                    reason: Some(reason),
+                    delivery_item_id: None,
+                    new_scan_state: None,
+                },
+            });
+        }
+
+        Ok(ApplyScansResponse { results })
+    }
+}
+
+/// Validiert Pflichtfelder ohne DB-Aufruf. Liefert `Some(reason)`,
+/// wenn das Event verworfen werden soll.
+fn pre_validate(event: &ScanEvent) -> Option<String> {
+    match event.action {
+        AuditAction::Hold | AuditAction::Remove => {
+            let trimmed = event.reason.as_deref().map(str::trim).unwrap_or("");
+            if trimmed.is_empty() {
+                Some(format!(
+                    "reason required for action {:?}",
+                    event.action
+                ))
+            } else {
+                None
+            }
+        }
+        AuditAction::Scan | AuditAction::Unscan | AuditAction::Unhold => None,
+    }
+}
--- a/crates/application/src/usecases/cars.rs
+++ b/crates/application/src/usecases/cars.rs
@ -0,0 +1,124 @@
+//! Use Cases rund um die Fahrzeug-Stammdaten eines Fahrers.
+//!
+//! Vier kleine Operationen — alle leichtgewichtig, weil die
+//! Account-Isolation strukturell im Repository sitzt.
+
+use std::sync::Arc;
+
+use uuid::Uuid;
+
+use holzleitner_domain::Car;
+
+use crate::dto::{CreateCarRequest, UpdateCarRequest};
+use crate::error::ApplicationError;
+use crate::ports::CarRepository;
+
+pub struct ListMyCarsUseCase {
+    repository: Arc<dyn CarRepository>,
+}
+
+impl ListMyCarsUseCase {
+    pub fn new(repository: Arc<dyn CarRepository>) -> Self {
+        Self { repository }
+    }
+
+    pub async fn execute(
+        &self,
+        personalnummer: i64,
+        include_inactive: bool,
+    ) -> Result<Vec<Car>, ApplicationError> {
+        self.repository
+            .find_by_account(personalnummer, include_inactive)
+            .await
+    }
+}
+
+pub struct CreateMyCarUseCase {
+    repository: Arc<dyn CarRepository>,
+}
+
+impl CreateMyCarUseCase {
+    pub fn new(repository: Arc<dyn CarRepository>) -> Self {
+        Self { repository }
+    }
+
+    pub async fn execute(
+        &self,
+        personalnummer: i64,
+        request: CreateCarRequest,
+    ) -> Result<Car, ApplicationError> {
+        let plate = request.plate.trim();
+        if plate.is_empty() {
+            return Err(ApplicationError::Validation(
+                "plate darf nicht leer sein".into(),
+            ));
+        }
+        self.repository.create(personalnummer, plate).await
+    }
+}
+
+pub struct UpdateMyCarUseCase {
+    repository: Arc<dyn CarRepository>,
+}
+
+impl UpdateMyCarUseCase {
+    pub fn new(repository: Arc<dyn CarRepository>) -> Self {
+        Self { repository }
+    }
+
+    pub async fn execute(
+        &self,
+        car_id: Uuid,
+        personalnummer: i64,
+        request: UpdateCarRequest,
+    ) -> Result<Car, ApplicationError> {
+        // Leerer Body ist erlaubt (idempotenter PATCH), aber wenn
+        // plate gesetzt ist, darf es nicht nur Whitespace sein.
+        let plate = match request.plate {
+            Some(p) => {
+                let trimmed = p.trim();
+                if trimmed.is_empty() {
+                    return Err(ApplicationError::Validation(
+                        "plate darf nicht leer sein".into(),
+                    ));
+                }
+                Some(trimmed.to_owned())
+            }
+            None => None,
+        };
+
+        self.repository
+            .update(car_id, personalnummer, plate.as_deref(), request.active)
+            .await
+    }
+}
+
+/// Setzt das `assigned_car_id` einer Lieferung. Validiert die
+/// Fahrzeug-Ownership und delegiert dann an `DeliveryRepository`.
+pub struct AssignCarToDeliveryUseCase {
+    cars: Arc<dyn CarRepository>,
+    deliveries: Arc<dyn crate::ports::DeliveryRepository>,
+}
+
+impl AssignCarToDeliveryUseCase {
+    pub fn new(
+        cars: Arc<dyn CarRepository>,
+        deliveries: Arc<dyn crate::ports::DeliveryRepository>,
+    ) -> Self {
+        Self { cars, deliveries }
+    }
+
+    pub async fn execute(
+        &self,
+        delivery_id: Uuid,
+        personalnummer: i64,
+        car_id: Option<Uuid>,
+    ) -> Result<holzleitner_domain::Delivery, ApplicationError> {
+        if let Some(id) = car_id {
+            self.cars
+                .assert_owned_by_account(&[id], personalnummer)
+                .await?;
+        }
+        self.deliveries.assign_car(delivery_id, car_id).await
+    }
+}
--- a/crates/application/src/usecases/create_delivery_note.rs
+++ b/crates/application/src/usecases/create_delivery_note.rs
@ -0,0 +1,73 @@
+use std::sync::Arc;
+
+use uuid::Uuid;
+
+use holzleitner_domain::DeliveryNote;
+
+use crate::dto::CreateDeliveryNoteRequest;
+use crate::error::ApplicationError;
+use crate::ports::{CarRepository, DeliveryNoteRepository};
+
+/// Legt eine neue Notiz an einer Lieferung an.
+///
+/// Validierung:
+/// * mindestens eines von `text` (nicht-leer nach trim) und
+///   `image_attachment` (nicht-leer nach trim) muss gesetzt sein.
+/// * `author_car_id` muss — falls gesetzt — zum angemeldeten Account gehören.
+pub struct CreateDeliveryNoteUseCase {
+    repository: Arc<dyn DeliveryNoteRepository>,
+    cars: Arc<dyn CarRepository>,
+}
+
+impl CreateDeliveryNoteUseCase {
+    pub fn new(
+        repository: Arc<dyn DeliveryNoteRepository>,
+        cars: Arc<dyn CarRepository>,
+    ) -> Self {
+        Self { repository, cars }
+    }
+
+    pub async fn execute(
+        &self,
+        delivery_id: Uuid,
+        author_personalnummer: i64,
+        request: CreateDeliveryNoteRequest,
+    ) -> Result<DeliveryNote, ApplicationError> {
+        let text = clean(request.text);
+        let image = clean(request.image_attachment);
+
+        if text.is_none() && image.is_none() {
+            return Err(ApplicationError::Validation(
+                "notiz braucht text oder image_attachment".into(),
+            ));
+        }
+
+        if let Some(car_id) = request.author_car_id {
+            self.cars
+                .assert_owned_by_account(&[car_id], author_personalnummer)
+                .await?;
+        }
+
+        self.repository
+            .create(
+                delivery_id,
+                author_personalnummer,
+                request.author_car_id,
+                text,
+                image,
+            )
+            .await
+    }
+}
+
+/// Trim + leerer-String → None.
+fn clean(input: Option<String>) -> Option<String> {
+    input.and_then(|s| {
+        let trimmed = s.trim();
+        if trimmed.is_empty() {
+            None
+        } else {
+            Some(trimmed.to_owned())
+        }
+    })
+}
--- a/crates/application/src/usecases/get_account.rs
+++ b/crates/application/src/usecases/get_account.rs
@ -0,0 +1,28 @@
+use std::sync::Arc;
+
+use holzleitner_domain::Account;
+
+use crate::error::ApplicationError;
+use crate::ports::AccountRepository;
+
+/// Liefert den Account zu einer Personalnummer oder einen
+/// [`ApplicationError::NotFound`], wenn nichts gefunden wurde.
+///
+/// Bewusst trivial — dient erstmal als End-to-End-Smoke-Test, damit
+/// alle Schichten zusammen laufen.
+pub struct GetAccountUseCase {
+    repository: Arc<dyn AccountRepository>,
+}
+
+impl GetAccountUseCase {
+    pub fn new(repository: Arc<dyn AccountRepository>) -> Self {
+        Self { repository }
+    }
+
+    pub async fn execute(&self, personalnummer: i64) -> Result<Account, ApplicationError> {
+        self.repository
+            .find_by_personalnummer(personalnummer)
+            .await?
+            .ok_or(ApplicationError::NotFound)
+    }
+}
--- a/crates/application/src/usecases/get_tour.rs
+++ b/crates/application/src/usecases/get_tour.rs
@ -0,0 +1,26 @@
+use std::sync::Arc;
+
+use uuid::Uuid;
+
+use crate::dto::TourDetails;
+use crate::error::ApplicationError;
+use crate::ports::TourRepository;
+
+/// Liefert das vollständige Tour-Aggregat (Lieferungen, Positionen,
+/// Stammdaten) für eine Tour-Id. Genau ein Round-Trip für die App.
+pub struct GetTourUseCase {
+    repository: Arc<dyn TourRepository>,
+}
+
+impl GetTourUseCase {
+    pub fn new(repository: Arc<dyn TourRepository>) -> Self {
+        Self { repository }
+    }
+
+    pub async fn execute(&self, tour_id: Uuid) -> Result<TourDetails, ApplicationError> {
+        self.repository
+            .find_details_by_id(tour_id)
+            .await?
+            .ok_or(ApplicationError::NotFound)
+    }
+}
--- a/crates/application/src/usecases/list_my_tours_today.rs
+++ b/crates/application/src/usecases/list_my_tours_today.rs
@ -0,0 +1,27 @@
+use std::sync::Arc;
+
+use chrono::Utc;
+
+use crate::dto::TourSummary;
+use crate::error::ApplicationError;
+use crate::ports::TourRepository;
+
+/// Liste der heutigen Touren des angemeldeten Fahrers. Das "heute"
+/// liegt **bewusst im Backend**: die App-Uhr ist nicht autoritativ
+/// (Zeitzone, Falsch-Stand, Manipulation).
+pub struct ListMyToursTodayUseCase {
+    repository: Arc<dyn TourRepository>,
+}
+
+impl ListMyToursTodayUseCase {
+    pub fn new(repository: Arc<dyn TourRepository>) -> Self {
+        Self { repository }
+    }
+
+    pub async fn execute(&self, personalnummer: i64) -> Result<Vec<TourSummary>, ApplicationError> {
+        let today = Utc::now().date_naive();
+        self.repository
+            .find_today_for_driver(personalnummer, today)
+            .await
+    }
+}
--- a/crates/application/src/usecases/mod.rs
+++ b/crates/application/src/usecases/mod.rs
@ -0,0 +1,28 @@
+//! Use Cases — Geschäftslogik-Operationen.
+//!
+//! Jeder Use Case kapselt **eine** Operation aus Sicht des Anwenders
+//! (z. B. „Tour des Tages laden", „Artikel scannen", „Lieferung
+//! abbrechen"). Use Cases nehmen Ports (Trait-Objekte) per Konstruktor
+//! entgegen und orchestrieren damit das Domänenmodell.
+
+pub mod apply_delivery_action;
+pub mod apply_scans;
+pub mod cars;
+pub mod create_delivery_note;
+pub mod get_account;
+pub mod get_tour;
+pub mod list_my_tours_today;
+pub mod set_delivery_order;
+pub mod sync_tour;
+
+pub use apply_delivery_action::ApplyDeliveryActionUseCase;
+pub use apply_scans::ApplyScansUseCase;
+pub use cars::{
+    AssignCarToDeliveryUseCase, CreateMyCarUseCase, ListMyCarsUseCase, UpdateMyCarUseCase,
+};
+pub use create_delivery_note::CreateDeliveryNoteUseCase;
+pub use get_account::GetAccountUseCase;
+pub use get_tour::GetTourUseCase;
+pub use list_my_tours_today::ListMyToursTodayUseCase;
+pub use set_delivery_order::SetDeliveryOrderUseCase;
+pub use sync_tour::SyncTourUseCase;
--- a/crates/application/src/usecases/set_delivery_order.rs
+++ b/crates/application/src/usecases/set_delivery_order.rs
@ -0,0 +1,53 @@
+use std::collections::HashSet;
+use std::sync::Arc;
+
+use uuid::Uuid;
+
+use crate::dto::{SetDeliveryOrderRequest, SetDeliveryOrderResponse};
+use crate::error::ApplicationError;
+use crate::ports::TourRepository;
+
+/// Schreibt die Sortier-Reihenfolge aller Lieferungen einer Tour neu.
+///
+/// Eingabe-Validierung (vor DB-Aufruf):
+/// * mindestens eine Id
+/// * keine Duplikate
+///
+/// Die Mengen-Übereinstimmung mit der Tour wird in der Persistence
+/// geprüft (braucht DB-Kontext).
+pub struct SetDeliveryOrderUseCase {
+    repository: Arc<dyn TourRepository>,
+}
+
+impl SetDeliveryOrderUseCase {
+    pub fn new(repository: Arc<dyn TourRepository>) -> Self {
+        Self { repository }
+    }
+
+    pub async fn execute(
+        &self,
+        tour_id: Uuid,
+        request: SetDeliveryOrderRequest,
+    ) -> Result<SetDeliveryOrderResponse, ApplicationError> {
+        if request.delivery_ids.is_empty() {
+            return Err(ApplicationError::Validation(
+                "delivery_ids darf nicht leer sein".into(),
+            ));
+        }
+        let mut seen = HashSet::with_capacity(request.delivery_ids.len());
+        for id in &request.delivery_ids {
+            if !seen.insert(*id) {
+                return Err(ApplicationError::Validation(format!(
+                    "delivery_id {id} kommt mehrfach vor"
+                )));
+            }
+        }
+
+        let order = self
+            .repository
+            .set_delivery_order(tour_id, &request.delivery_ids)
+            .await?;
+
+        Ok(SetDeliveryOrderResponse { tour_id, order })
+    }
+}
--- a/crates/application/src/usecases/sync_tour.rs
+++ b/crates/application/src/usecases/sync_tour.rs
@ -0,0 +1,54 @@
+use std::sync::Arc;
+
+use uuid::Uuid;
+
+use crate::dto::SyncTourRequest;
+use crate::error::ApplicationError;
+use crate::ports::TourRepository;
+
+/// Übernimmt eine Tagestour aus dem ERP. Idempotent: wiederholte Aufrufe
+/// mit gleichem `(driver_personalnummer, tour_date)` aktualisieren die
+/// bestehende Tour, statt eine neue anzulegen.
+///
+/// Validierung läuft hier in der Application-Schicht — die Repository-
+/// Schicht darf einen sauberen Datensatz erwarten.
+pub struct SyncTourUseCase {
+    repository: Arc<dyn TourRepository>,
+}
+
+impl SyncTourUseCase {
+    pub fn new(repository: Arc<dyn TourRepository>) -> Self {
+        Self { repository }
+    }
+
+    pub async fn execute(&self, request: SyncTourRequest) -> Result<Uuid, ApplicationError> {
+        if request.deliveries.is_empty() {
+            return Err(ApplicationError::Validation(
+                "tour ohne lieferungen abgelehnt".into(),
+            ));
+        }
+        for delivery in &request.deliveries {
+            if delivery.belegnummer.trim().is_empty() {
+                return Err(ApplicationError::Validation(
+                    "leere belegnummer".into(),
+                ));
+            }
+            if delivery.items.is_empty() {
+                return Err(ApplicationError::Validation(format!(
+                    "lieferung {} ohne positionen",
+                    delivery.belegnummer
+                )));
+            }
+            for item in &delivery.items {
+                if item.required_quantity <= 0 {
+                    return Err(ApplicationError::Validation(format!(
+                        "lieferung {}, position {}: required_quantity muss > 0 sein",
+                        delivery.belegnummer, item.belegzeilen_nr
+                    )));
+                }
+            }
+        }
+
+        self.repository.upsert_from_sync(&request).await
+    }
+}
--- a/crates/domain/Cargo.toml
+++ b/crates/domain/Cargo.toml
@ -0,0 +1,18 @@
+[package]
+name = "holzleitner-domain"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+
+[features]
+# Opt-in: schaltet `utoipa::ToSchema`-Ableitungen für die OpenAPI-
+# Generierung in der API-Schicht frei. Konsumenten ohne OpenAPI-Bedarf
+# (z. B. CLI-Tools, Tests) bleiben utoipa-frei.
+openapi = ["dep:utoipa"]
+
+[dependencies]
+serde.workspace = true
+uuid.workspace = true
+chrono.workspace = true
+utoipa = { workspace = true, optional = true }
--- a/crates/domain/src/account.rs
+++ b/crates/domain/src/account.rs
@ -0,0 +1,19 @@
+use serde::{Deserialize, Serialize};
+
+/// Account eines Liefer-Unternehmens oder Einzel-Lieferfahrers.
+///
+/// Die Personalnummer ist sowohl Primärschlüssel als auch Login-ID. Sie
+/// stammt aus dem ERP-Stamm — entweder ein Unternehmen (juristische
+/// Person, eigener Personalnummern-Kreis) oder eine natürliche Person.
+///
+/// Mehrere physische Fahrer können denselben Account benutzen; das Modell
+/// unterscheidet sie nicht, sondern loggt die Aktivität auf [`crate::domain::Car`]-
+/// Ebene (siehe Audit-Log).
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct Account {
+    pub personalnummer: i64,
+    pub name: String,
+    pub active: bool,
+}
--- a/crates/domain/src/article.rs
+++ b/crates/domain/src/article.rs
@ -0,0 +1,19 @@
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// Artikel. ERP-Mirror; die `article_number` ist die business-stabile
+/// Artikelnummer aus dem ERP-Stamm und dient gleichzeitig als Brücke.
+///
+/// `scannable = false` markiert nicht-physische Positionen wie
+/// Dienstleistungen, Versandpauschalen o.ä. — sie tauchen zwar als
+/// `DeliveryItem` auf, blockieren aber den Beladen-Fortschritt nicht.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct Article {
+    pub id: Uuid,
+    pub article_number: String,
+    pub name: String,
+    pub scannable: bool,
+    pub default_warehouse_id: Option<Uuid>,
+}
--- a/crates/domain/src/audit.rs
+++ b/crates/domain/src/audit.rs
@ -0,0 +1,67 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use super::delivery::ScanStatus;
+
+/// Aktion-Typen im Scan-Audit-Log.
+///
+/// * `Scan` / `Unscan` verändern die `scanned_quantity` (+1 / -1).
+/// * `Hold` / `Unhold` ändern nur den Status, keine Menge.
+/// * `Remove` markiert die Position als entfernt (Status `Removed`,
+///   z. B. weil der Kunde sie nicht annimmt).
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "snake_case")]
+pub enum AuditAction {
+    Scan,
+    Unscan,
+    Hold,
+    Unhold,
+    Remove,
+}
+
+/// Append-only Audit-Log-Eintrag: jedes Ereignis am Scan-Zustand einer
+/// Position bekommt eine eigene Zeile. Nie geupdated, nie gelöscht.
+///
+/// Beleg-Bezug wird denormalisiert mitgeführt, damit der Audit-Trail
+/// auch dann auflösbar bleibt, wenn das zugehörige `DeliveryItem`
+/// irgendwann archiviert oder bereinigt wird.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct ScanAuditEntry {
+    pub id: Uuid,
+    /// Vom Client vergebene UUID — Idempotenz-Schlüssel beim Retry.
+    pub client_scan_id: Uuid,
+    pub delivery_item_id: Uuid,
+
+    pub action: AuditAction,
+
+    /// Signed Δ in `scanned_quantity`: +1 bei SCAN, -1 bei UNSCAN, 0 sonst.
+    pub delta: i32,
+
+    /// Snapshot der `scanned_quantity` direkt NACH dieser Aktion.
+    /// Vermeidet teure Aggregat-Queries bei Reports.
+    pub resulting_quantity: i32,
+
+    /// Status der Position NACH dieser Aktion.
+    pub resulting_status: ScanStatus,
+
+    /// Grund bei HOLD / REMOVE (jeweils Pflicht).
+    pub reason: Option<String>,
+
+    /// Akteur — Personalnummer aus dem JWT.
+    pub actor_personalnummer: i64,
+    /// Akteur-Fahrzeug, sofern bekannt (cars werden später verwaltet).
+    pub actor_car_id: Option<Uuid>,
+
+    pub client_scanned_at: DateTime<Utc>,
+    pub server_recorded_at: DateTime<Utc>,
+
+    // ── Denormalisierter ERP-Beleg-Bezug (Archiv-stabil) ───────────────
+    pub erp_belegart_id: i64,
+    pub erp_belegnummer: String,
+    pub erp_belegzeilen_nr: i32,
+    pub erp_komponenten_artikel_nr: Option<String>,
+}
--- a/crates/domain/src/car.rs
+++ b/crates/domain/src/car.rs
@ -0,0 +1,19 @@
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// Fahrzeug eines [`crate::domain::Account`]. Wird in der App selbst
+/// gepflegt — kein ERP-Spiegel. Eindeutig per UUID.
+///
+/// Im Audit-Log ist der `Car` der „Akteur": die Personalnummer-Ebene
+/// (Account) ist gröber und unterscheidet nicht zwischen mehreren
+/// gleichzeitig aktiven Fahrern desselben Subunternehmens.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct Car {
+    pub id: Uuid,
+    /// Verweis auf [`crate::domain::Account::personalnummer`].
+    pub account_id: i64,
+    pub plate: String,
+    pub active: bool,
+}
--- a/crates/domain/src/common.rs
+++ b/crates/domain/src/common.rs
@ -0,0 +1,20 @@
+use serde::{Deserialize, Serialize};
+
+/// Postanschrift — wird sowohl als aktuelle Kundenanschrift in [`Customer`]
+/// als auch als unveränderlicher Snapshot in [`crate::domain::Delivery`]
+/// verwendet (`delivery_address_snapshot`).
+///
+/// Bewusst als Value Object modelliert: gleiche Adresse = gleicher Wert.
+/// Strikte Equality erleichtert Sync-Diffs zwischen ERP und Backend.
+///
+/// [`Customer`]: crate::domain::Customer
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct Address {
+    pub street: String,
+    pub house_number: String,
+    pub postal_code: String,
+    pub city: String,
+    pub country: String,
+}
--- a/crates/domain/src/customer.rs
+++ b/crates/domain/src/customer.rs
@ -0,0 +1,37 @@
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use super::common::Address;
+
+/// Kunde. ERP-Mirror: die Stammdaten gehören dem ERP, wir spiegeln sie
+/// für die App. Die `erp_customer_id` ist die Brücke zurück (in der
+/// Regel die `Kunde.row_id` aus ERPframe).
+///
+/// Die `Customer.address` ist die *aktuelle* Anschrift. Für historische
+/// Stabilität führt [`crate::domain::Delivery`] zusätzlich einen
+/// `delivery_address_snapshot` — Adress-Änderungen wirken nicht
+/// rückwirkend auf bereits zugestellte oder geplante Lieferungen.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct Customer {
+    pub id: Uuid,
+    pub erp_customer_id: i64,
+    pub name: String,
+    pub address: Address,
+}
+
+/// Ansprechpartner eines Kunden. Ein Kunde kann mehrere Kontaktpersonen
+/// haben (z. B. Empfang vor Ort + Geschäftsführung). Eine Lieferung wählt
+/// 0..N davon als aktive Kontakte aus (siehe
+/// `Delivery::contact_person_ids`).
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct CustomerContact {
+    pub id: Uuid,
+    pub customer_id: Uuid,
+    pub name: String,
+    pub phone: Option<String>,
+    pub email: Option<String>,
+}
--- a/crates/domain/src/delivery.rs
+++ b/crates/domain/src/delivery.rs
@ -0,0 +1,135 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use super::common::Address;
+
+/// Lebenszyklus einer Lieferung.
+///
+/// `Held` ist für „heute nicht zustellbar, aber nicht endgültig abgesagt"
+/// reserviert; `Canceled` ist endgültig. `Completed` setzt der
+/// Abschluss-Flow am Ende der Auslieferung.
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "snake_case")]
+pub enum DeliveryState {
+    Active,
+    Held,
+    Canceled,
+    Completed,
+}
+
+/// Eine einzelne Lieferung an einen Kunden. Aggregat-Wurzel für die
+/// Liefer-Items, Notizen und das ggf. zugeordnete Fahrzeug.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct Delivery {
+    pub id: Uuid,
+    pub tour_id: Uuid,
+
+    /// ERP-Beleg-Bezug: business-stabiles Paar `(Belegart, Belegnummer)`.
+    /// Überlebt den Belegkopf-Archivübergang.
+    pub erp_belegart_id: i64,
+    pub erp_belegnummer: String,
+
+    pub customer_id: Uuid,
+
+    /// Eingefrorene Liefer-Adresse zum Zeitpunkt des Tour-Syncs.
+    /// Schützt vor rückwirkenden Kunden-Adressänderungen.
+    pub delivery_address_snapshot: Address,
+
+    /// Fahrzeug-Zuordnung, gesetzt in der Auswählen-Phase.
+    /// Bei Ein-Auto-Teams beim Sync automatisch gefüllt.
+    pub assigned_car_id: Option<Uuid>,
+
+    /// Ausgewählte Ansprechpartner für genau diese Lieferung (Auswahl
+    /// aus `Customer.contacts`). Kann leer sein.
+    pub contact_person_ids: Vec<Uuid>,
+
+    /// Wunsch-Lieferzeit als Freitext (z. B. "vormittags", "ab 14:00").
+    pub desired_time: Option<String>,
+
+    /// Sondervereinbarungen (z. B. „Türklingel defekt, hintenrum klopfen").
+    pub special_agreements: Option<String>,
+
+    pub state: DeliveryState,
+
+    /// Begründung bei `state == Held` oder `state == Canceled`. Beim
+    /// Resume / Complete wieder `None`.
+    pub state_reason: Option<String>,
+}
+
+/// Status einer einzelnen Scan-Position innerhalb eines Items.
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "snake_case")]
+pub enum ScanStatus {
+    InProgress,
+    Done,
+    Held,
+    Removed,
+}
+
+/// Eingebetteter Scan-Zustand pro [`DeliveryItem`]. Wird durch
+/// `ScanAuditEntry`-Events fortgeschrieben — das Audit-Log ist die
+/// Wahrheit über das WIE und WANN, dieses Embedded-VO ist die schnelle
+/// Wahrheit über das WIEVIEL.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct ScanState {
+    pub scanned_quantity: i32,
+    pub status: ScanStatus,
+    /// Grund bei `status == Held` oder `status == Removed`.
+    pub held_reason: Option<String>,
+    pub last_updated_at: DateTime<Utc>,
+}
+
+/// Einzelposition einer Lieferung. Vereint reguläre Belegzeilen und
+/// Stücklisten-Komponenten zu einer flachen Liste — die Stücklisten-
+/// Hierarchie ist ein ERP-Konstrukt und wird beim Sync aufgelöst.
+///
+/// Über die Felder `belegzeilen_nr` und `komponenten_artikel_nr` bleibt
+/// die ERP-Herkunft auflösbar.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct DeliveryItem {
+    pub id: Uuid,
+    pub delivery_id: Uuid,
+
+    pub article_id: Uuid,
+    pub required_quantity: i32,
+    pub warehouse_id: Uuid,
+
+    /// ERP-Belegzeilen-Nr (Position innerhalb des Belegs).
+    pub belegzeilen_nr: i32,
+
+    /// Bei Items aus einer Stückliste: Artikelnummer der Komponente.
+    /// Bei regulären Belegzeilen: `None`.
+    pub komponenten_artikel_nr: Option<String>,
+
+    pub scan_state: ScanState,
+}
+
+/// Notiz an einer Lieferung — frei eingegeben durch den Fahrer.
+///
+/// Mindestens eines von `text` oder `image_attachment` muss gesetzt
+/// sein. Die Constraint sitzt sowohl im DB-Schema (CHECK) als auch
+/// in der Application-Schicht.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct DeliveryNote {
+    pub id: Uuid,
+    pub delivery_id: Uuid,
+    pub text: Option<String>,
+    /// Referenz auf einen Bild-Anhang (z. B. Object-Storage-Key/URL).
+    pub image_attachment: Option<String>,
+    /// Personalnummer des Akteurs (aus dem JWT). Pflicht.
+    pub author_personalnummer: i64,
+    /// Fahrzeug, falls bekannt — nullable bis das Backend Cars verwaltet.
+    pub author_car_id: Option<Uuid>,
+    pub created_at: DateTime<Utc>,
+}
--- a/crates/domain/src/lib.rs
+++ b/crates/domain/src/lib.rs
@ -0,0 +1,38 @@
+//! Domänenmodell des Lieferservice-Backends.
+//!
+//! Aufbau pro Aggregat-Wurzel bzw. zusammengehöriger Begriffsgruppe.
+//! Reihenfolge der Module entspricht inhaltlich der Datenfluss-Logik:
+//! Stamm- und Strukturdaten zuerst, danach transaktionale Aggregate
+//! (Tour → Delivery → Audit), zuletzt der prozessuale Zustand.
+//!
+//! **Konventionen**
+//! * Rust-Felder in `snake_case`, JSON via `serde` in `camelCase`.
+//! * Enum-Varianten in `PascalCase`, JSON via `serde` in `snake_case`.
+//! * Identifier vom ERP (Personalnummer, Belegart/-nummer, Artikelnummer)
+//!   behalten ihre fachlichen Namen, weil sie als Brücken im Datenmodell
+//!   erkennbar bleiben sollen.
+//! * Eigene IDs sind UUIDs — entkoppelt vom ERP, generieren wir selbst.
+
+#![allow(dead_code)] // Modelle werden später von Service-Schicht genutzt.
+
+mod account;
+mod article;
+mod audit;
+mod car;
+mod common;
+mod customer;
+mod delivery;
+mod process_state;
+mod tour;
+mod warehouse;
+
+pub use account::Account;
+pub use article::Article;
+pub use audit::{AuditAction, ScanAuditEntry};
+pub use car::Car;
+pub use common::Address;
+pub use customer::{Customer, CustomerContact};
+pub use delivery::{Delivery, DeliveryItem, DeliveryNote, DeliveryState, ScanState, ScanStatus};
+pub use process_state::{DeliveryPhase, DeliveryProcessState};
+pub use tour::Tour;
+pub use warehouse::Warehouse;
--- a/crates/domain/src/process_state.rs
+++ b/crates/domain/src/process_state.rs
@ -0,0 +1,50 @@
+use chrono::{DateTime, NaiveDate, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// Phasen des geführten Tagesablaufs eines Fahrers.
+///
+/// Die Reihenfolge der Varianten entspricht dem natürlichen Fortschritt;
+/// `PartialOrd`/`Ord` werden derived, sodass `current < max_reached`
+/// als „besucht"-Check funktioniert.
+///
+/// `Auswaehlen` ist optional und nur sichtbar bei Accounts mit mehreren
+/// Fahrzeugen — die Eintrittsphase bei einem Ein-Auto-Account ist
+/// `Sortieren`.
+#[derive(
+    Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Hash, PartialOrd, Ord,
+)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "snake_case")]
+pub enum DeliveryPhase {
+    Auswaehlen,
+    Sortieren,
+    Beladen,
+    Ausliefern,
+}
+
+/// Prozess-State pro Fahrzeug pro Tag. Trägt sowohl die aktuelle Phase
+/// als auch die höchste je erreichte Phase — damit Rück- und
+/// Vorwärtssprünge zwischen besuchten Phasen erlaubt sind.
+///
+/// `sorting_order` ist die in der Sortier-Phase festgelegte
+/// Auslieferungsreihenfolge (Liste von [`crate::domain::Delivery`]-IDs).
+/// Bei der Beladung wird sie umgekehrt benutzt (letzte Lieferung zuerst
+/// ins Auto).
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct DeliveryProcessState {
+    pub id: Uuid,
+    pub car_id: Uuid,
+    pub date: NaiveDate,
+
+    pub current_phase: DeliveryPhase,
+    pub max_reached_phase: DeliveryPhase,
+
+    pub sorting_order: Vec<Uuid>,
+
+    /// Gesetzt sobald die Sortierung bestätigt wurde — markiert den
+    /// Übergang von `Sortieren` nach `Beladen` als „offiziell".
+    pub confirmed_at: Option<DateTime<Utc>>,
+}
--- a/crates/domain/src/tour.rs
+++ b/crates/domain/src/tour.rs
@ -0,0 +1,20 @@
+use chrono::{DateTime, NaiveDate, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// Tour eines Tages, pro [`crate::domain::Account`]. Aggregat-Wurzel
+/// für die Lieferungen dieses Tages — die einzelnen [`crate::domain::Delivery`]
+/// referenzieren ihre Tour per FK.
+///
+/// Der Sync vom ERP läuft in der Regel einmal am Vortag und füllt eine
+/// neue Tour-Zeile inklusive Delivery- und DeliveryItem-Strukturen.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct Tour {
+    pub id: Uuid,
+    pub account_id: i64,
+    pub date: NaiveDate,
+    /// Zeitpunkt des letzten ERP-Sync — für Drift-Erkennung.
+    pub synced_at: DateTime<Utc>,
+}
--- a/crates/domain/src/warehouse.rs
+++ b/crates/domain/src/warehouse.rs
@ -0,0 +1,15 @@
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// Lager. ERP-Mirror; `code` ist die ERP-Lager-Nr (z. B. `"0"` für das
+/// Standardlager). Das `is_standard`-Flag ist der schnelle Filter für
+/// die Beladen-Logik („nur Standardlager-Artikel zählen für Fertig").
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
+#[serde(rename_all = "camelCase")]
+pub struct Warehouse {
+    pub id: Uuid,
+    pub code: String,
+    pub name: String,
+    pub is_standard: bool,
+}
--- a/crates/infrastructure/Cargo.toml
+++ b/crates/infrastructure/Cargo.toml
@ -0,0 +1,21 @@
+[package]
+name = "holzleitner-infrastructure"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+
+[dependencies]
+holzleitner-domain.workspace = true
+holzleitner-application.workspace = true
+async-trait.workspace = true
+thiserror.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+uuid.workspace = true
+chrono.workspace = true
+tokio.workspace = true
+sqlx.workspace = true
+reqwest.workspace = true
+jsonwebtoken.workspace = true
+tracing.workspace = true
--- a/crates/infrastructure/src/auth/keycloak.rs
+++ b/crates/infrastructure/src/auth/keycloak.rs
@ -0,0 +1,241 @@
+//! Keycloak-Implementierung von [`AuthService`].
+//!
+//! ## Verifikations-Flow
+//!
+//! 1. OIDC-Discovery (`{issuer}/.well-known/openid-configuration`) holt
+//!    einmalig den `jwks_uri`. Wird gecached.
+//! 2. JWKS (`jwks_uri`) liefert die aktuellen Signatur-Schlüssel. Cache
+//!    läuft nach `jwks_cache_ttl` ab, oder wird beim ersten unbekannten
+//!    `kid` proaktiv aktualisiert (Key-Rotation).
+//! 3. JWT wird mit `jsonwebtoken` validiert: Signatur, `exp`, `iss`,
+//!    `aud`. Anschließend werden die fachlichen Claims extrahiert.
+//!
+//! ## Concurrency
+//!
+//! Der Cache hängt hinter `Arc<RwLock<...>>` (Tokio). Lese-Zugriffe
+//! laufen lock-free auf Snapshot-Daten, Schreibzugriffe sind selten
+//! (nur beim Refresh).
+
+use std::collections::HashMap;
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+
+use async_trait::async_trait;
+use chrono::{TimeZone, Utc};
+use holzleitner_application::ports::{AuthError, AuthService, Claims};
+use jsonwebtoken::{Algorithm, DecodingKey, Validation, decode, decode_header};
+use serde::Deserialize;
+use tokio::sync::RwLock;
+
+/// Konfiguration für den Keycloak-Adapter. Befüllt typischerweise aus
+/// der API-Konfig (`KEYCLOAK_*`-Env-Vars).
+#[derive(Debug, Clone)]
+pub struct KeycloakAdapterConfig {
+    /// Voll-qualifizierter Issuer (Realm-URL), z. B.
+    /// `http://localhost:8080/realms/holzleitner`. **Ohne** trailing slash.
+    pub issuer_url: String,
+    /// Erwartete Audience im Access-Token (= Client/Resource-Name).
+    pub audience: String,
+    /// Zeit, bevor der lokale JWKS-Cache zwangsweise neu gezogen wird.
+    pub jwks_cache_ttl: Duration,
+}
+
+pub struct KeycloakAuthService {
+    config: KeycloakAdapterConfig,
+    http: reqwest::Client,
+    cache: Arc<RwLock<JwksCache>>,
+}
+
+#[derive(Default)]
+struct JwksCache {
+    /// `kid` → fertige DecodingKey zur Verifikation.
+    keys: HashMap<String, DecodingKey>,
+    /// Zeitpunkt des letzten erfolgreichen Refresh.
+    fetched_at: Option<Instant>,
+    /// Aus OIDC-Discovery aufgelöste JWKS-URL — wird gemerkt.
+    jwks_uri: Option<String>,
+}
+
+impl KeycloakAuthService {
+    pub fn new(config: KeycloakAdapterConfig) -> Self {
+        Self {
+            config,
+            http: reqwest::Client::new(),
+            cache: Arc::new(RwLock::new(JwksCache::default())),
+        }
+    }
+
+    async fn discover_jwks_uri(&self) -> Result<String, AuthError> {
+        let url = format!(
+            "{}/.well-known/openid-configuration",
+            self.config.issuer_url.trim_end_matches('/')
+        );
+        let doc: OidcDiscovery = self
+            .http
+            .get(&url)
+            .send()
+            .await
+            .map_err(|e| AuthError::External(format!("OIDC discovery request: {e}")))?
+            .error_for_status()
+            .map_err(|e| AuthError::External(format!("OIDC discovery status: {e}")))?
+            .json()
+            .await
+            .map_err(|e| AuthError::External(format!("OIDC discovery body: {e}")))?;
+        Ok(doc.jwks_uri)
+    }
+
+    async fn refresh_jwks(&self) -> Result<(), AuthError> {
+        // jwks_uri einmal auflösen und merken.
+        let jwks_uri = {
+            let read = self.cache.read().await;
+            read.jwks_uri.clone()
+        };
+        let jwks_uri = match jwks_uri {
+            Some(u) => u,
+            None => {
+                let u = self.discover_jwks_uri().await?;
+                self.cache.write().await.jwks_uri = Some(u.clone());
+                u
+            }
+        };
+
+        let jwks: Jwks = self
+            .http
+            .get(&jwks_uri)
+            .send()
+            .await
+            .map_err(|e| AuthError::External(format!("JWKS request: {e}")))?
+            .error_for_status()
+            .map_err(|e| AuthError::External(format!("JWKS status: {e}")))?
+            .json()
+            .await
+            .map_err(|e| AuthError::External(format!("JWKS body: {e}")))?;
+
+        let mut next = HashMap::new();
+        for k in jwks.keys {
+            // Wir unterstützen erstmal nur RSA (Keycloak-Default).
+            if k.kty != "RSA" {
+                continue;
+            }
+            let Some(kid) = k.kid else { continue };
+            let key = DecodingKey::from_rsa_components(&k.n, &k.e)
+                .map_err(|e| AuthError::External(format!("RSA key decode: {e}")))?;
+            next.insert(kid, key);
+        }
+
+        let mut write = self.cache.write().await;
+        write.keys = next;
+        write.fetched_at = Some(Instant::now());
+        tracing::debug!(count = write.keys.len(), "jwks cache refreshed");
+        Ok(())
+    }
+
+    async fn key_for_kid(&self, kid: &str) -> Result<DecodingKey, AuthError> {
+        // 1) Lese-Pfad: wenn Cache frisch und kid bekannt → lock-free zurück.
+        {
+            let read = self.cache.read().await;
+            let expired = match read.fetched_at {
+                Some(t) => t.elapsed() > self.config.jwks_cache_ttl,
+                None => true,
+            };
+            if !expired {
+                if let Some(k) = read.keys.get(kid) {
+                    return Ok(k.clone());
+                }
+                // Cache frisch, aber kid nicht drin → Key-Rotation?
+                // Trotzdem refreshen, könnte ein neuer Key sein.
+            }
+        }
+
+        // 2) Refresh und nochmals nachsehen.
+        self.refresh_jwks().await?;
+        let read = self.cache.read().await;
+        read.keys
+            .get(kid)
+            .cloned()
+            .ok_or_else(|| AuthError::Invalid(format!("unknown kid: {kid}")))
+    }
+}
+
+#[async_trait]
+impl AuthService for KeycloakAuthService {
+    async fn verify_token(&self, bearer_token: &str) -> Result<Claims, AuthError> {
+        let header = decode_header(bearer_token)
+            .map_err(|e| AuthError::Invalid(format!("header parse: {e}")))?;
+        let kid = header
+            .kid
+            .ok_or_else(|| AuthError::Invalid("missing kid".into()))?;
+
+        let key = self.key_for_kid(&kid).await?;
+
+        let mut validation = Validation::new(Algorithm::RS256);
+        validation.set_audience(&[&self.config.audience]);
+        validation.set_issuer(&[&self.config.issuer_url]);
+        validation.validate_exp = true;
+
+        let token = decode::<RawClaims>(bearer_token, &key, &validation).map_err(|e| {
+            match e.kind() {
+                jsonwebtoken::errors::ErrorKind::ExpiredSignature => AuthError::Expired,
+                jsonwebtoken::errors::ErrorKind::InvalidAudience => AuthError::InvalidAudience,
+                _ => AuthError::Invalid(format!("verify: {e}")),
+            }
+        })?;
+
+        let raw = token.claims;
+        let personalnummer = raw
+            .personalnummer
+            .ok_or(AuthError::MissingClaim("personalnummer"))?;
+        let roles = raw
+            .realm_access
+            .map(|r| r.roles)
+            .unwrap_or_default();
+        let expires_at = Utc
+            .timestamp_opt(raw.exp, 0)
+            .single()
+            .ok_or_else(|| AuthError::Invalid("invalid exp".into()))?;
+
+        Ok(Claims {
+            personalnummer,
+            subject: raw.sub,
+            roles,
+            expires_at,
+        })
+    }
+}
+
+// =============================================================================
+// JSON-Hilfstypen
+// =============================================================================
+
+#[derive(Deserialize)]
+struct OidcDiscovery {
+    jwks_uri: String,
+}
+
+#[derive(Deserialize)]
+struct Jwks {
+    keys: Vec<JwksKey>,
+}
+
+#[derive(Deserialize)]
+struct JwksKey {
+    kid: Option<String>,
+    kty: String,
+    n: String,
+    e: String,
+}
+
+/// Rohformat der Token-Claims direkt aus dem JWT-Body. Wird unmittelbar
+/// danach in das fachliche [`Claims`]-Struct übersetzt.
+#[derive(Deserialize)]
+struct RawClaims {
+    sub: String,
+    exp: i64,
+    personalnummer: Option<i64>,
+    realm_access: Option<RealmAccess>,
+}
+
+#[derive(Deserialize)]
+struct RealmAccess {
+    roles: Vec<String>,
+}
--- a/crates/infrastructure/src/auth/mod.rs
+++ b/crates/infrastructure/src/auth/mod.rs
@ -0,0 +1,10 @@
+//! Auth-Adapter: Keycloak OAuth2/OIDC.
+//!
+//! Implementiert den `AuthService`-Port aus
+//! `holzleitner_application::ports`. Discovery via OIDC-`/.well-known/`-
+//! Endpunkt, JWT-Verifikation gegen den JWKS-Endpunkt, Claims-Mapping
+//! auf das Domänenmodell (Personalnummer, Rollen).
+
+pub mod keycloak;
+
+pub use keycloak::{KeycloakAdapterConfig, KeycloakAuthService};
--- a/crates/infrastructure/src/lib.rs
+++ b/crates/infrastructure/src/lib.rs
@ -0,0 +1,13 @@
+//! Infrastructure Layer — konkrete Adapter zu externen Systemen.
+//!
+//! Implementiert die in `holzleitner_application::ports` definierten
+//! Traits gegen reale Technologien:
+//! * [`persistence`] — Postgres via sqlx
+//! * [`auth`]        — Keycloak OAuth2/OIDC via reqwest + jsonwebtoken
+//!
+//! Wer hier was Neues anhängt (z. B. einen Object-Storage-Adapter für
+//! Note-Bilder), legt ein neues Submodul an und implementiert dort die
+//! passenden Application-Ports.
+
+pub mod auth;
+pub mod persistence;
--- a/crates/infrastructure/src/persistence/account_repository.rs
+++ b/crates/infrastructure/src/persistence/account_repository.rs
@ -0,0 +1,54 @@
+use async_trait::async_trait;
+use holzleitner_application::error::ApplicationError;
+use holzleitner_application::ports::AccountRepository;
+use holzleitner_domain::Account;
+use sqlx::PgPool;
+
+/// SQLx-Postgres-Implementierung von [`AccountRepository`].
+pub struct PgAccountRepository {
+    pool: PgPool,
+}
+
+impl PgAccountRepository {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+}
+
+/// Tabellen-Zeile aus `accounts`. Eigener Typ in der Infrastructure-
+/// Schicht, damit der Domain-Typ [`Account`] frei von `sqlx`-Traits
+/// bleibt.
+#[derive(sqlx::FromRow)]
+struct AccountRow {
+    personalnummer: i64,
+    name: String,
+    active: bool,
+}
+
+impl From<AccountRow> for Account {
+    fn from(row: AccountRow) -> Self {
+        Account {
+            personalnummer: row.personalnummer,
+            name: row.name,
+            active: row.active,
+        }
+    }
+}
+
+#[async_trait]
+impl AccountRepository for PgAccountRepository {
+    async fn find_by_personalnummer(
+        &self,
+        personalnummer: i64,
+    ) -> Result<Option<Account>, ApplicationError> {
+        let row = sqlx::query_as::<_, AccountRow>(
+            "SELECT personalnummer, name, active FROM accounts WHERE personalnummer = $1",
+        )
+        .bind(personalnummer)
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(|e| ApplicationError::Repository(e.to_string()))?;
+
+        Ok(row.map(Account::from))
+    }
+}
--- a/crates/infrastructure/src/persistence/car_repository.rs
+++ b/crates/infrastructure/src/persistence/car_repository.rs
@ -0,0 +1,191 @@
+//! Postgres-Implementierung des `CarRepository`-Ports.
+//!
+//! Account-Isolation ist strukturell: jede SQL-Query filtert auf
+//! `account_id`. Ein Fahrzeug, das einem anderen Account gehört, ist
+//! aus Sicht dieses Repositories nicht existent (`NotFound`).
+
+use async_trait::async_trait;
+use sqlx::PgPool;
+use uuid::Uuid;
+
+use holzleitner_application::error::ApplicationError;
+use holzleitner_application::ports::CarRepository;
+use holzleitner_domain::Car;
+
+pub struct PgCarRepository {
+    pool: PgPool,
+}
+
+impl PgCarRepository {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+}
+
+#[derive(sqlx::FromRow)]
+struct CarRow {
+    id: Uuid,
+    account_id: i64,
+    plate: String,
+    active: bool,
+}
+
+impl From<CarRow> for Car {
+    fn from(r: CarRow) -> Self {
+        Car {
+            id: r.id,
+            account_id: r.account_id,
+            plate: r.plate,
+            active: r.active,
+        }
+    }
+}
+
+fn db<E: std::fmt::Display>(e: E) -> ApplicationError {
+    ApplicationError::Repository(e.to_string())
+}
+
+/// Postgres-Fehlercode für UNIQUE-Verletzungen — wir mappen sie auf
+/// einen lesbaren `Validation`-Fehler.
+fn is_unique_violation(err: &sqlx::Error) -> bool {
+    matches!(
+        err,
+        sqlx::Error::Database(db_err) if db_err.code().as_deref() == Some("23505")
+    )
+}
+
+#[async_trait]
+impl CarRepository for PgCarRepository {
+    async fn find_by_account(
+        &self,
+        personalnummer: i64,
+        include_inactive: bool,
+    ) -> Result<Vec<Car>, ApplicationError> {
+        let rows = sqlx::query_as::<_, CarRow>(
+            r#"
+            SELECT id, account_id, plate, active
+            FROM cars
+            WHERE account_id = $1
+              AND (active = TRUE OR $2)
+            ORDER BY plate
+            "#,
+        )
+        .bind(personalnummer)
+        .bind(include_inactive)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?;
+        Ok(rows.into_iter().map(Car::from).collect())
+    }
+
+    async fn find_by_id_for_account(
+        &self,
+        car_id: Uuid,
+        personalnummer: i64,
+    ) -> Result<Option<Car>, ApplicationError> {
+        let row = sqlx::query_as::<_, CarRow>(
+            "SELECT id, account_id, plate, active FROM cars WHERE id = $1 AND account_id = $2",
+        )
+        .bind(car_id)
+        .bind(personalnummer)
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(db)?;
+        Ok(row.map(Car::from))
+    }
+
+    async fn create(
+        &self,
+        personalnummer: i64,
+        plate: &str,
+    ) -> Result<Car, ApplicationError> {
+        let result = sqlx::query_as::<_, CarRow>(
+            r#"
+            INSERT INTO cars (account_id, plate)
+            VALUES ($1, $2)
+            RETURNING id, account_id, plate, active
+            "#,
+        )
+        .bind(personalnummer)
+        .bind(plate)
+        .fetch_one(&self.pool)
+        .await;
+
+        match result {
+            Ok(row) => Ok(Car::from(row)),
+            Err(err) if is_unique_violation(&err) => Err(ApplicationError::Validation(format!(
+                "kennzeichen '{plate}' existiert bereits"
+            ))),
+            Err(err) => Err(db(err)),
+        }
+    }
+
+    async fn update(
+        &self,
+        car_id: Uuid,
+        personalnummer: i64,
+        plate: Option<&str>,
+        active: Option<bool>,
+    ) -> Result<Car, ApplicationError> {
+        // COALESCE-Pattern: NULL-Argumente lassen die Spalte unverändert.
+        let result = sqlx::query_as::<_, CarRow>(
+            r#"
+            UPDATE cars
+            SET plate  = COALESCE($3, plate),
+                active = COALESCE($4, active)
+            WHERE id = $1 AND account_id = $2
+            RETURNING id, account_id, plate, active
+            "#,
+        )
+        .bind(car_id)
+        .bind(personalnummer)
+        .bind(plate)
+        .bind(active)
+        .fetch_optional(&self.pool)
+        .await;
+
+        match result {
+            Ok(Some(row)) => Ok(Car::from(row)),
+            Ok(None) => Err(ApplicationError::NotFound),
+            Err(err) if is_unique_violation(&err) => Err(ApplicationError::Validation(
+                "kennzeichen existiert bereits".into(),
+            )),
+            Err(err) => Err(db(err)),
+        }
+    }
+
+    async fn assert_owned_by_account(
+        &self,
+        car_ids: &[Uuid],
+        personalnummer: i64,
+    ) -> Result<(), ApplicationError> {
+        if car_ids.is_empty() {
+            return Ok(());
+        }
+        let owned: Vec<Uuid> = sqlx::query_scalar(
+            r#"
+            SELECT id FROM cars
+            WHERE id = ANY($1) AND account_id = $2
+            "#,
+        )
+        .bind(car_ids)
+        .bind(personalnummer)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?;
+
+        if owned.len() == car_ids.len() {
+            Ok(())
+        } else {
+            let owned_set: std::collections::HashSet<Uuid> = owned.into_iter().collect();
+            let foreign: Vec<Uuid> = car_ids
+                .iter()
+                .copied()
+                .filter(|id| !owned_set.contains(id))
+                .collect();
+            Err(ApplicationError::Validation(format!(
+                "fahrzeug(e) {foreign:?} gehören nicht zu diesem account"
+            )))
+        }
+    }
+}
--- a/crates/infrastructure/src/persistence/delivery_note_repository.rs
+++ b/crates/infrastructure/src/persistence/delivery_note_repository.rs
@ -0,0 +1,76 @@
+//! Postgres-Implementierung des `DeliveryNoteRepository`-Ports.
+//!
+//! Existenz-Check der Lieferung vor dem Insert: liefert einen sauberen
+//! `NotFound`, statt den FK-Verletzungs-Fehlertext durchzureichen.
+
+use async_trait::async_trait;
+use chrono::{DateTime, Utc};
+use sqlx::PgPool;
+use uuid::Uuid;
+
+use holzleitner_application::error::ApplicationError;
+use holzleitner_application::ports::DeliveryNoteRepository;
+use holzleitner_domain::DeliveryNote;
+
+pub struct PgDeliveryNoteRepository {
+    pool: PgPool,
+}
+
+impl PgDeliveryNoteRepository {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+}
+
+fn db<E: std::fmt::Display>(e: E) -> ApplicationError {
+    ApplicationError::Repository(e.to_string())
+}
+
+#[async_trait]
+impl DeliveryNoteRepository for PgDeliveryNoteRepository {
+    async fn create(
+        &self,
+        delivery_id: Uuid,
+        author_personalnummer: i64,
+        author_car_id: Option<Uuid>,
+        text: Option<String>,
+        image_attachment: Option<String>,
+    ) -> Result<DeliveryNote, ApplicationError> {
+        let exists: Option<Uuid> =
+            sqlx::query_scalar("SELECT id FROM deliveries WHERE id = $1")
+                .bind(delivery_id)
+                .fetch_optional(&self.pool)
+                .await
+                .map_err(db)?;
+        if exists.is_none() {
+            return Err(ApplicationError::NotFound);
+        }
+
+        let (id, created_at): (Uuid, DateTime<Utc>) = sqlx::query_as(
+            r#"
+            INSERT INTO delivery_notes (
+                delivery_id, text, image_attachment, author_personalnummer, author_car_id
+            ) VALUES ($1, $2, $3, $4, $5)
+            RETURNING id, created_at
+            "#,
+        )
+        .bind(delivery_id)
+        .bind(text.as_deref())
+        .bind(image_attachment.as_deref())
+        .bind(author_personalnummer)
+        .bind(author_car_id)
+        .fetch_one(&self.pool)
+        .await
+        .map_err(db)?;
+
+        Ok(DeliveryNote {
+            id,
+            delivery_id,
+            text,
+            image_attachment,
+            author_personalnummer,
+            author_car_id,
+            created_at,
+        })
+    }
+}
--- a/crates/infrastructure/src/persistence/delivery_repository.rs
+++ b/crates/infrastructure/src/persistence/delivery_repository.rs
@ -0,0 +1,250 @@
+//! Postgres-Implementierung des `DeliveryRepository`-Ports.
+//!
+//! Ein Aktionsaufruf entspricht genau einer Transaktion. Ablauf:
+//! 1. `SELECT … FOR UPDATE` auf die Lieferung (Lock + aktueller State).
+//! 2. Übergang validieren — bei invalider Quelle `Validation`-Fehler.
+//! 3. `UPDATE deliveries SET state = …, state_reason = …`.
+//! 4. Kontaktpersonen-Verknüpfungen laden, frische `Delivery` bauen.
+//!
+//! Die Validierung lebt **hier**, weil sie den aktuellen DB-State
+//! braucht. Im Use Case sitzt nur die Pflicht-Reason-Prüfung.
+
+use async_trait::async_trait;
+use sqlx::{PgPool, Postgres, Transaction};
+use uuid::Uuid;
+
+use holzleitner_application::error::ApplicationError;
+use holzleitner_application::ports::{DeliveryAction, DeliveryRepository};
+use holzleitner_domain::{Address, Delivery, DeliveryState};
+
+pub struct PgDeliveryRepository {
+    pool: PgPool,
+}
+
+impl PgDeliveryRepository {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+}
+
+#[derive(sqlx::FromRow)]
+struct DeliveryRow {
+    id: Uuid,
+    tour_id: Uuid,
+    erp_belegart_id: i64,
+    erp_belegnummer: String,
+    customer_id: Uuid,
+    snap_street: String,
+    snap_house_number: String,
+    snap_postal_code: String,
+    snap_city: String,
+    snap_country: String,
+    assigned_car_id: Option<Uuid>,
+    desired_time: Option<String>,
+    special_agreements: Option<String>,
+    state: String,
+}
+
+fn db<E: std::fmt::Display>(e: E) -> ApplicationError {
+    ApplicationError::Repository(e.to_string())
+}
+
+fn parse_state(value: &str) -> Result<DeliveryState, ApplicationError> {
+    match value {
+        "active" => Ok(DeliveryState::Active),
+        "held" => Ok(DeliveryState::Held),
+        "canceled" => Ok(DeliveryState::Canceled),
+        "completed" => Ok(DeliveryState::Completed),
+        other => Err(ApplicationError::Repository(format!(
+            "unknown delivery state '{other}'"
+        ))),
+    }
+}
+
+fn state_str(s: DeliveryState) -> &'static str {
+    match s {
+        DeliveryState::Active => "active",
+        DeliveryState::Held => "held",
+        DeliveryState::Canceled => "canceled",
+        DeliveryState::Completed => "completed",
+    }
+}
+
+/// Berechnet Ziel-State + neuen Reason aus aktueller Quelle und Aktion.
+/// `Err(reason)` bei invalidem Übergang — wird vom Use Case als
+/// `ApplicationError::Validation` durchgereicht.
+fn next_state(
+    current: DeliveryState,
+    action: &DeliveryAction,
+) -> Result<(DeliveryState, Option<String>), String> {
+    use DeliveryAction as A;
+    use DeliveryState as S;
+    match (current, action) {
+        (S::Active, A::Hold { reason }) => Ok((S::Held, Some(reason.clone()))),
+        (S::Held, A::Resume) => Ok((S::Active, None)),
+        (S::Active | S::Held, A::Cancel { reason }) => Ok((S::Canceled, Some(reason.clone()))),
+        (S::Active, A::Complete) => Ok((S::Completed, None)),
+
+        (S::Completed, _) => Err("delivery ist completed".into()),
+        (S::Canceled, _) => Err("delivery ist canceled".into()),
+        (s, a) => Err(format!(
+            "invalider übergang {:?} aus state {:?}",
+            a, s
+        )),
+    }
+}
+
+async fn lock_delivery(
+    tx: &mut Transaction<'_, Postgres>,
+    delivery_id: Uuid,
+) -> Result<Option<DeliveryRow>, ApplicationError> {
+    sqlx::query_as::<_, DeliveryRow>(
+        r#"
+        SELECT
+            id, tour_id, erp_belegart_id, erp_belegnummer, customer_id,
+            snap_street, snap_house_number, snap_postal_code, snap_city, snap_country,
+            assigned_car_id, desired_time, special_agreements,
+            state
+        FROM deliveries
+        WHERE id = $1
+        FOR UPDATE
+        "#,
+    )
+    .bind(delivery_id)
+    .fetch_optional(&mut **tx)
+    .await
+    .map_err(db)
+}
+
+async fn load_contacts(
+    tx: &mut Transaction<'_, Postgres>,
+    delivery_id: Uuid,
+) -> Result<Vec<Uuid>, ApplicationError> {
+    let rows: Vec<(Uuid,)> = sqlx::query_as(
+        "SELECT customer_contact_id FROM delivery_contact_persons WHERE delivery_id = $1",
+    )
+    .bind(delivery_id)
+    .fetch_all(&mut **tx)
+    .await
+    .map_err(db)?;
+    Ok(rows.into_iter().map(|(id,)| id).collect())
+}
+
+#[async_trait]
+impl DeliveryRepository for PgDeliveryRepository {
+    async fn apply_action(
+        &self,
+        delivery_id: Uuid,
+        action: DeliveryAction,
+    ) -> Result<Delivery, ApplicationError> {
+        let mut tx = self.pool.begin().await.map_err(db)?;
+
+        let Some(row) = lock_delivery(&mut tx, delivery_id).await? else {
+            tx.rollback().await.map_err(db)?;
+            return Err(ApplicationError::NotFound);
+        };
+
+        let current = parse_state(&row.state)?;
+        let (target, new_reason) = match next_state(current, &action) {
+            Ok(v) => v,
+            Err(reason) => {
+                tx.rollback().await.map_err(db)?;
+                return Err(ApplicationError::Validation(reason));
+            }
+        };
+
+        sqlx::query(
+            r#"
+            UPDATE deliveries
+            SET state = $1,
+                state_reason = $2
+            WHERE id = $3
+            "#,
+        )
+        .bind(state_str(target))
+        .bind(new_reason.as_deref())
+        .bind(delivery_id)
+        .execute(&mut *tx)
+        .await
+        .map_err(db)?;
+
+        let contact_person_ids = load_contacts(&mut tx, delivery_id).await?;
+        tx.commit().await.map_err(db)?;
+
+        Ok(Delivery {
+            id: row.id,
+            tour_id: row.tour_id,
+            erp_belegart_id: row.erp_belegart_id,
+            erp_belegnummer: row.erp_belegnummer,
+            customer_id: row.customer_id,
+            delivery_address_snapshot: Address {
+                street: row.snap_street,
+                house_number: row.snap_house_number,
+                postal_code: row.snap_postal_code,
+                city: row.snap_city,
+                country: row.snap_country,
+            },
+            assigned_car_id: row.assigned_car_id,
+            contact_person_ids,
+            desired_time: row.desired_time,
+            special_agreements: row.special_agreements,
+            state: target,
+            state_reason: new_reason,
+        })
+    }
+
+    async fn assign_car(
+        &self,
+        delivery_id: Uuid,
+        car_id: Option<Uuid>,
+    ) -> Result<Delivery, ApplicationError> {
+        let mut tx = self.pool.begin().await.map_err(db)?;
+
+        let Some(row) = lock_delivery(&mut tx, delivery_id).await? else {
+            tx.rollback().await.map_err(db)?;
+            return Err(ApplicationError::NotFound);
+        };
+
+        let current = parse_state(&row.state)?;
+
+        sqlx::query("UPDATE deliveries SET assigned_car_id = $1 WHERE id = $2")
+            .bind(car_id)
+            .bind(delivery_id)
+            .execute(&mut *tx)
+            .await
+            .map_err(db)?;
+
+        // state_reason holen wir aus dem Lock-Row — die Aktion ändert
+        // nichts daran.
+        let state_reason: Option<String> =
+            sqlx::query_scalar("SELECT state_reason FROM deliveries WHERE id = $1")
+                .bind(delivery_id)
+                .fetch_one(&mut *tx)
+                .await
+                .map_err(db)?;
+
+        let contact_person_ids = load_contacts(&mut tx, delivery_id).await?;
+        tx.commit().await.map_err(db)?;
+
+        Ok(Delivery {
+            id: row.id,
+            tour_id: row.tour_id,
+            erp_belegart_id: row.erp_belegart_id,
+            erp_belegnummer: row.erp_belegnummer,
+            customer_id: row.customer_id,
+            delivery_address_snapshot: Address {
+                street: row.snap_street,
+                house_number: row.snap_house_number,
+                postal_code: row.snap_postal_code,
+                city: row.snap_city,
+                country: row.snap_country,
+            },
+            assigned_car_id: car_id,
+            contact_person_ids,
+            desired_time: row.desired_time,
+            special_agreements: row.special_agreements,
+            state: current,
+            state_reason,
+        })
+    }
+}
--- a/crates/infrastructure/src/persistence/mod.rs
+++ b/crates/infrastructure/src/persistence/mod.rs
@ -0,0 +1,21 @@
+//! Persistence-Adapter: Postgres via sqlx.
+//!
+//! Jede Repository-Trait aus `holzleitner_application::ports` bekommt
+//! hier eine konkrete `Pg…Repository`-Implementierung. Connection-Pool
+//! und Migrations werden ebenfalls hier verwaltet.
+
+pub mod account_repository;
+pub mod car_repository;
+pub mod delivery_note_repository;
+pub mod delivery_repository;
+pub mod pool;
+pub mod scan_repository;
+pub mod tour_repository;
+
+pub use account_repository::PgAccountRepository;
+pub use car_repository::PgCarRepository;
+pub use delivery_note_repository::PgDeliveryNoteRepository;
+pub use delivery_repository::PgDeliveryRepository;
+pub use pool::{connect_and_migrate, PoolConfig};
+pub use scan_repository::PgScanRepository;
+pub use tour_repository::PgTourRepository;
--- a/crates/infrastructure/src/persistence/pool.rs
+++ b/crates/infrastructure/src/persistence/pool.rs
@ -0,0 +1,26 @@
+use sqlx::PgPool;
+use sqlx::postgres::PgPoolOptions;
+
+/// Konfigurationsparameter für den Postgres-Connection-Pool. Wird
+/// typischerweise aus der API-Schicht (Composition Root) befüllt.
+#[derive(Debug, Clone)]
+pub struct PoolConfig {
+    pub url: String,
+    pub max_connections: u32,
+}
+
+/// Baut den Postgres-Pool auf und führt alle ausstehenden Migrations
+/// aus dem Workspace-Migrations-Verzeichnis aus.
+///
+/// Die Migration-Definition ist über `sqlx::migrate!()` zur Compile-Zeit
+/// eingebettet — kein zusätzlicher Dateizugriff zur Laufzeit nötig.
+pub async fn connect_and_migrate(config: &PoolConfig) -> Result<PgPool, sqlx::Error> {
+    let pool = PgPoolOptions::new()
+        .max_connections(config.max_connections)
+        .connect(&config.url)
+        .await?;
+
+    sqlx::migrate!("../../migrations").run(&pool).await?;
+
+    Ok(pool)
+}
--- a/crates/infrastructure/src/persistence/scan_repository.rs
+++ b/crates/infrastructure/src/persistence/scan_repository.rs
@ -0,0 +1,319 @@
+//! Postgres-Implementierung des `ScanRepository`-Ports.
+//!
+//! Pro Event eine eigene Transaktion. Ablauf:
+//! 1. `SELECT … FOR UPDATE` auf das Item (Lock + aktueller State).
+//! 2. Zustandsübergang berechnen oder mit `Rejected` aussteigen.
+//! 3. `INSERT INTO scan_audit … ON CONFLICT DO NOTHING RETURNING id`
+//!    * Hat die Insert eine Zeile geliefert → Audit ist frisch,
+//!      `UPDATE delivery_items` mit neuem State, commit, `Applied`.
+//!    * Sonst → `client_scan_id` war schon da, rollback der Tx mit dem
+//!      unveränderten Item, `Duplicate` mit dem unter (1) gelesenen State.
+//!
+//! Race-frei: zwei parallele Requests mit identischem `client_scan_id`
+//! kollidieren an der UNIQUE-Constraint und bekommen sauber genau einen
+//! `Applied` und einen `Duplicate`.
+
+use async_trait::async_trait;
+use chrono::{DateTime, Utc};
+use sqlx::{PgPool, Postgres, Transaction};
+use uuid::Uuid;
+
+use holzleitner_application::dto::ScanEvent;
+use holzleitner_application::error::ApplicationError;
+use holzleitner_application::ports::{ApplyScanOutcome, ScanRepository};
+use holzleitner_domain::{AuditAction, ScanState, ScanStatus};
+
+pub struct PgScanRepository {
+    pool: PgPool,
+}
+
+impl PgScanRepository {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+}
+
+/// Komplette Sicht auf eine Position inklusive ERP-Bezug — was wir
+/// für Zustandsübergang und Audit-Insert brauchen, in einer Query.
+#[derive(sqlx::FromRow)]
+struct ItemLockRow {
+    id: Uuid,
+    required_quantity: i32,
+    scanned_quantity: i32,
+    scan_status: String,
+    held_reason: Option<String>,
+    scan_last_updated_at: DateTime<Utc>,
+    belegzeilen_nr: i32,
+    komponenten_artikel_nr: Option<String>,
+    erp_belegart_id: i64,
+    erp_belegnummer: String,
+}
+
+fn db<E: std::fmt::Display>(e: E) -> ApplicationError {
+    ApplicationError::Repository(e.to_string())
+}
+
+fn parse_status(value: &str) -> Result<ScanStatus, ApplicationError> {
+    match value {
+        "in_progress" => Ok(ScanStatus::InProgress),
+        "done" => Ok(ScanStatus::Done),
+        "held" => Ok(ScanStatus::Held),
+        "removed" => Ok(ScanStatus::Removed),
+        other => Err(ApplicationError::Repository(format!(
+            "unknown scan status '{other}'"
+        ))),
+    }
+}
+
+fn status_str(s: ScanStatus) -> &'static str {
+    match s {
+        ScanStatus::InProgress => "in_progress",
+        ScanStatus::Done => "done",
+        ScanStatus::Held => "held",
+        ScanStatus::Removed => "removed",
+    }
+}
+
+fn action_str(a: AuditAction) -> &'static str {
+    match a {
+        AuditAction::Scan => "scan",
+        AuditAction::Unscan => "unscan",
+        AuditAction::Hold => "hold",
+        AuditAction::Unhold => "unhold",
+        AuditAction::Remove => "remove",
+    }
+}
+
+/// Ergebnis einer reinen Zustandsübergangs-Rechnung (ohne DB).
+struct Transition {
+    delta: i32,
+    new_quantity: i32,
+    new_status: ScanStatus,
+    new_held_reason: Option<String>,
+}
+
+/// Berechnet den nächsten Zustand. Bei `Err` enthält der String die
+/// fachliche Ablehnungs-Begründung, die 1:1 an die App geht.
+fn apply_transition(
+    action: AuditAction,
+    current_qty: i32,
+    current_status: ScanStatus,
+    required_qty: i32,
+    reason: Option<&str>,
+) -> Result<Transition, String> {
+    match action {
+        AuditAction::Scan => match current_status {
+            ScanStatus::InProgress | ScanStatus::Done => {
+                let new_qty = current_qty + 1;
+                let new_status = if new_qty >= required_qty {
+                    ScanStatus::Done
+                } else {
+                    ScanStatus::InProgress
+                };
+                Ok(Transition {
+                    delta: 1,
+                    new_quantity: new_qty,
+                    new_status,
+                    new_held_reason: None,
+                })
+            }
+            ScanStatus::Held => Err("item is on hold; unhold before scanning".into()),
+            ScanStatus::Removed => Err("item is removed; cannot scan".into()),
+        },
+        AuditAction::Unscan => match current_status {
+            ScanStatus::InProgress | ScanStatus::Done => {
+                if current_qty == 0 {
+                    return Err("nothing scanned yet".into());
+                }
+                let new_qty = current_qty - 1;
+                Ok(Transition {
+                    delta: -1,
+                    new_quantity: new_qty,
+                    new_status: ScanStatus::InProgress,
+                    new_held_reason: None,
+                })
+            }
+            ScanStatus::Held => Err("item is on hold".into()),
+            ScanStatus::Removed => Err("item is removed".into()),
+        },
+        AuditAction::Hold => match current_status {
+            ScanStatus::InProgress | ScanStatus::Done => Ok(Transition {
+                delta: 0,
+                new_quantity: current_qty,
+                new_status: ScanStatus::Held,
+                new_held_reason: reason.map(str::to_owned),
+            }),
+            ScanStatus::Held => Err("item is already held".into()),
+            ScanStatus::Removed => Err("item is removed".into()),
+        },
+        AuditAction::Unhold => match current_status {
+            ScanStatus::Held => {
+                let new_status = if current_qty >= required_qty {
+                    ScanStatus::Done
+                } else {
+                    ScanStatus::InProgress
+                };
+                Ok(Transition {
+                    delta: 0,
+                    new_quantity: current_qty,
+                    new_status,
+                    new_held_reason: None,
+                })
+            }
+            _ => Err("item is not held".into()),
+        },
+        AuditAction::Remove => match current_status {
+            ScanStatus::Removed => Err("item is already removed".into()),
+            _ => Ok(Transition {
+                delta: 0,
+                new_quantity: current_qty,
+                new_status: ScanStatus::Removed,
+                new_held_reason: reason.map(str::to_owned),
+            }),
+        },
+    }
+}
+
+async fn lock_item(
+    tx: &mut Transaction<'_, Postgres>,
+    delivery_item_id: Uuid,
+) -> Result<Option<ItemLockRow>, ApplicationError> {
+    sqlx::query_as::<_, ItemLockRow>(
+        r#"
+        SELECT
+            di.id,
+            di.required_quantity,
+            di.scanned_quantity,
+            di.scan_status,
+            di.held_reason,
+            di.scan_last_updated_at,
+            di.belegzeilen_nr,
+            di.komponenten_artikel_nr,
+            d.erp_belegart_id,
+            d.erp_belegnummer
+        FROM delivery_items di
+        JOIN deliveries d ON d.id = di.delivery_id
+        WHERE di.id = $1
+        FOR UPDATE OF di
+        "#,
+    )
+    .bind(delivery_item_id)
+    .fetch_optional(&mut **tx)
+    .await
+    .map_err(db)
+}
+
+#[async_trait]
+impl ScanRepository for PgScanRepository {
+    async fn apply_one(
+        &self,
+        event: &ScanEvent,
+        actor_personalnummer: i64,
+    ) -> Result<ApplyScanOutcome, ApplicationError> {
+        let mut tx = self.pool.begin().await.map_err(db)?;
+
+        let Some(item) = lock_item(&mut tx, event.delivery_item_id).await? else {
+            tx.rollback().await.map_err(db)?;
+            return Ok(ApplyScanOutcome::Rejected {
+                reason: format!("unknown delivery_item_id {}", event.delivery_item_id),
+            });
+        };
+
+        let current_status = parse_status(&item.scan_status)?;
+        let current_state = ScanState {
+            scanned_quantity: item.scanned_quantity,
+            status: current_status,
+            held_reason: item.held_reason.clone(),
+            last_updated_at: item.scan_last_updated_at,
+        };
+
+        let transition = match apply_transition(
+            event.action,
+            item.scanned_quantity,
+            current_status,
+            item.required_quantity,
+            event.reason.as_deref(),
+        ) {
+            Ok(t) => t,
+            Err(reason) => {
+                tx.rollback().await.map_err(db)?;
+                return Ok(ApplyScanOutcome::Rejected { reason });
+            }
+        };
+
+        // Audit-Insert. ON CONFLICT DO NOTHING macht die Idempotenz: ist
+        // die client_scan_id schon da, returnen wir keine Zeile.
+        let inserted_id: Option<Uuid> = sqlx::query_scalar(
+            r#"
+            INSERT INTO scan_audit (
+                client_scan_id, delivery_item_id, action,
+                delta, resulting_quantity, resulting_status,
+                reason, actor_personalnummer, actor_car_id, client_scanned_at,
+                erp_belegart_id, erp_belegnummer, erp_belegzeilen_nr,
+                erp_komponenten_artikel_nr
+            ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14)
+            ON CONFLICT (client_scan_id) DO NOTHING
+            RETURNING id
+            "#,
+        )
+        .bind(event.client_scan_id)
+        .bind(item.id)
+        .bind(action_str(event.action))
+        .bind(transition.delta)
+        .bind(transition.new_quantity)
+        .bind(status_str(transition.new_status))
+        .bind(transition.new_held_reason.as_deref())
+        .bind(actor_personalnummer)
+        .bind(event.actor_car_id)
+        .bind(event.client_scanned_at)
+        .bind(item.erp_belegart_id)
+        .bind(&item.erp_belegnummer)
+        .bind(item.belegzeilen_nr)
+        .bind(item.komponenten_artikel_nr.as_deref())
+        .fetch_optional(&mut *tx)
+        .await
+        .map_err(db)?;
+
+        if inserted_id.is_none() {
+            // Duplicate: alles zurück, aktueller State (vor diesem Versuch)
+            // an die App.
+            tx.rollback().await.map_err(db)?;
+            return Ok(ApplyScanOutcome::Duplicate {
+                delivery_item_id: item.id,
+                current_state,
+            });
+        }
+
+        // Applied: Item-State fortschreiben.
+        let new_last_updated: DateTime<Utc> = sqlx::query_scalar(
+            r#"
+            UPDATE delivery_items
+            SET scanned_quantity     = $1,
+                scan_status          = $2,
+                held_reason          = $3,
+                scan_last_updated_at = now()
+            WHERE id = $4
+            RETURNING scan_last_updated_at
+            "#,
+        )
+        .bind(transition.new_quantity)
+        .bind(status_str(transition.new_status))
+        .bind(transition.new_held_reason.as_deref())
+        .bind(item.id)
+        .fetch_one(&mut *tx)
+        .await
+        .map_err(db)?;
+
+        tx.commit().await.map_err(db)?;
+
+        Ok(ApplyScanOutcome::Applied {
+            delivery_item_id: item.id,
+            new_state: ScanState {
+                scanned_quantity: transition.new_quantity,
+                status: transition.new_status,
+                held_reason: transition.new_held_reason,
+                last_updated_at: new_last_updated,
+            },
+        })
+    }
+}
--- a/crates/infrastructure/src/persistence/tour_repository.rs
+++ b/crates/infrastructure/src/persistence/tour_repository.rs
@ -0,0 +1,815 @@
+//! Postgres-Implementierung des `TourRepository`-Ports.
+//!
+//! Drei Operationen, getrennt umgesetzt:
+//! * `find_today_for_driver` — eine Query (Tour + Lieferzahl pro Tour).
+//! * `find_details_by_id` — pro Aggregat ein paar gezielte Queries,
+//!   anschließend in-memory zusammenbauen. Bewusst keine eine-Big-Join-
+//!   Query: das vervielfacht Daten über die Leitung, die wir clientseitig
+//!   wieder deduplizieren müssten — und Postgres handhabt 5–7 kleine
+//!   Prepared Statements im selben Pool effizient genug.
+//! * `upsert_from_sync` — eine Transaktion, idempotent per UPSERT auf
+//!   den fachlichen Keys. Bestehende `scan_state`-Werte bleiben
+//!   unangetastet: das ERP weiß nichts davon und darf sie nicht
+//!   überschreiben.
+
+use std::collections::HashMap;
+
+use async_trait::async_trait;
+use chrono::{DateTime, NaiveDate, Utc};
+use sqlx::{PgPool, Postgres, Transaction};
+use uuid::Uuid;
+
+use holzleitner_application::dto::{
+    DeliveryOrderEntry, DeliveryWithItems, SyncDelivery, SyncDeliveryItem, SyncTourRequest,
+    TourDetails, TourSummary,
+};
+use holzleitner_application::error::ApplicationError;
+use holzleitner_application::ports::TourRepository;
+use holzleitner_domain::{
+    Address, Article, Customer, CustomerContact, Delivery, DeliveryItem, DeliveryNote,
+    DeliveryState, ScanState, ScanStatus, Tour, Warehouse,
+};
+
+pub struct PgTourRepository {
+    pool: PgPool,
+}
+
+impl PgTourRepository {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+}
+
+// ===== Row-Typen =========================================================
+//
+// Eigene FromRow-Strukturen in der Infrastructure halten die Domain-Typen
+// frei von `sqlx`-Traits. Mapping in private Helfer.
+
+#[derive(sqlx::FromRow)]
+struct TourRow {
+    id: Uuid,
+    account_id: i64,
+    tour_date: NaiveDate,
+    synced_at: DateTime<Utc>,
+}
+
+#[derive(sqlx::FromRow)]
+struct TourSummaryRow {
+    id: Uuid,
+    tour_date: NaiveDate,
+    delivery_count: i64,
+}
+
+#[derive(sqlx::FromRow)]
+struct DeliveryRow {
+    id: Uuid,
+    tour_id: Uuid,
+    erp_belegart_id: i64,
+    erp_belegnummer: String,
+    customer_id: Uuid,
+    snap_street: String,
+    snap_house_number: String,
+    snap_postal_code: String,
+    snap_city: String,
+    snap_country: String,
+    assigned_car_id: Option<Uuid>,
+    desired_time: Option<String>,
+    special_agreements: Option<String>,
+    state: String,
+    state_reason: Option<String>,
+    sort_order: i32,
+}
+
+#[derive(sqlx::FromRow)]
+struct DeliveryItemRow {
+    id: Uuid,
+    delivery_id: Uuid,
+    article_id: Uuid,
+    required_quantity: i32,
+    warehouse_id: Uuid,
+    belegzeilen_nr: i32,
+    komponenten_artikel_nr: Option<String>,
+    scanned_quantity: i32,
+    scan_status: String,
+    held_reason: Option<String>,
+    scan_last_updated_at: DateTime<Utc>,
+}
+
+#[derive(sqlx::FromRow)]
+struct CustomerRow {
+    id: Uuid,
+    erp_customer_id: i64,
+    name: String,
+    street: String,
+    house_number: String,
+    postal_code: String,
+    city: String,
+    country: String,
+}
+
+#[derive(sqlx::FromRow)]
+struct CustomerContactRow {
+    id: Uuid,
+    customer_id: Uuid,
+    name: String,
+    phone: Option<String>,
+    email: Option<String>,
+}
+
+#[derive(sqlx::FromRow)]
+struct ArticleRow {
+    id: Uuid,
+    article_number: String,
+    name: String,
+    scannable: bool,
+    default_warehouse_id: Option<Uuid>,
+}
+
+#[derive(sqlx::FromRow)]
+struct WarehouseRow {
+    id: Uuid,
+    code: String,
+    name: String,
+    is_standard: bool,
+}
+
+#[derive(sqlx::FromRow)]
+struct ContactLinkRow {
+    delivery_id: Uuid,
+    customer_contact_id: Uuid,
+}
+
+#[derive(sqlx::FromRow)]
+struct DeliveryNoteRow {
+    id: Uuid,
+    delivery_id: Uuid,
+    text: Option<String>,
+    image_attachment: Option<String>,
+    author_personalnummer: i64,
+    author_car_id: Option<Uuid>,
+    created_at: DateTime<Utc>,
+}
+
+// ===== Mapping Row -> Domain =============================================
+
+fn map_tour(row: TourRow) -> Tour {
+    Tour {
+        id: row.id,
+        account_id: row.account_id,
+        date: row.tour_date,
+        synced_at: row.synced_at,
+    }
+}
+
+fn parse_delivery_state(value: &str) -> Result<DeliveryState, ApplicationError> {
+    match value {
+        "active" => Ok(DeliveryState::Active),
+        "held" => Ok(DeliveryState::Held),
+        "canceled" => Ok(DeliveryState::Canceled),
+        "completed" => Ok(DeliveryState::Completed),
+        other => Err(ApplicationError::Repository(format!(
+            "unknown delivery state '{other}'"
+        ))),
+    }
+}
+
+fn parse_scan_status(value: &str) -> Result<ScanStatus, ApplicationError> {
+    match value {
+        "in_progress" => Ok(ScanStatus::InProgress),
+        "done" => Ok(ScanStatus::Done),
+        "held" => Ok(ScanStatus::Held),
+        "removed" => Ok(ScanStatus::Removed),
+        other => Err(ApplicationError::Repository(format!(
+            "unknown scan status '{other}'"
+        ))),
+    }
+}
+
+fn map_item(row: DeliveryItemRow) -> Result<DeliveryItem, ApplicationError> {
+    Ok(DeliveryItem {
+        id: row.id,
+        delivery_id: row.delivery_id,
+        article_id: row.article_id,
+        required_quantity: row.required_quantity,
+        warehouse_id: row.warehouse_id,
+        belegzeilen_nr: row.belegzeilen_nr,
+        komponenten_artikel_nr: row.komponenten_artikel_nr,
+        scan_state: ScanState {
+            scanned_quantity: row.scanned_quantity,
+            status: parse_scan_status(&row.scan_status)?,
+            held_reason: row.held_reason,
+            last_updated_at: row.scan_last_updated_at,
+        },
+    })
+}
+
+fn map_customer(row: CustomerRow) -> Customer {
+    Customer {
+        id: row.id,
+        erp_customer_id: row.erp_customer_id,
+        name: row.name,
+        address: Address {
+            street: row.street,
+            house_number: row.house_number,
+            postal_code: row.postal_code,
+            city: row.city,
+            country: row.country,
+        },
+    }
+}
+
+fn map_contact(row: CustomerContactRow) -> CustomerContact {
+    CustomerContact {
+        id: row.id,
+        customer_id: row.customer_id,
+        name: row.name,
+        phone: row.phone,
+        email: row.email,
+    }
+}
+
+fn map_article(row: ArticleRow) -> Article {
+    Article {
+        id: row.id,
+        article_number: row.article_number,
+        name: row.name,
+        scannable: row.scannable,
+        default_warehouse_id: row.default_warehouse_id,
+    }
+}
+
+fn map_note(row: DeliveryNoteRow) -> DeliveryNote {
+    DeliveryNote {
+        id: row.id,
+        delivery_id: row.delivery_id,
+        text: row.text,
+        image_attachment: row.image_attachment,
+        author_personalnummer: row.author_personalnummer,
+        author_car_id: row.author_car_id,
+        created_at: row.created_at,
+    }
+}
+
+fn map_warehouse(row: WarehouseRow) -> Warehouse {
+    Warehouse {
+        id: row.id,
+        code: row.code,
+        name: row.name,
+        is_standard: row.is_standard,
+    }
+}
+
+fn map_delivery(
+    row: DeliveryRow,
+    contact_person_ids: Vec<Uuid>,
+) -> Result<(Delivery, i32), ApplicationError> {
+    let state = parse_delivery_state(&row.state)?;
+    let delivery = Delivery {
+        id: row.id,
+        tour_id: row.tour_id,
+        erp_belegart_id: row.erp_belegart_id,
+        erp_belegnummer: row.erp_belegnummer,
+        customer_id: row.customer_id,
+        delivery_address_snapshot: Address {
+            street: row.snap_street,
+            house_number: row.snap_house_number,
+            postal_code: row.snap_postal_code,
+            city: row.snap_city,
+            country: row.snap_country,
+        },
+        assigned_car_id: row.assigned_car_id,
+        contact_person_ids,
+        desired_time: row.desired_time,
+        special_agreements: row.special_agreements,
+        state,
+        state_reason: row.state_reason,
+    };
+    Ok((delivery, row.sort_order))
+}
+
+// ===== Helfer: Error-Mapping =============================================
+
+fn db<E: std::fmt::Display>(e: E) -> ApplicationError {
+    ApplicationError::Repository(e.to_string())
+}
+
+// ===== Trait-Implementierung =============================================
+
+#[async_trait]
+impl TourRepository for PgTourRepository {
+    async fn find_today_for_driver(
+        &self,
+        personalnummer: i64,
+        today: NaiveDate,
+    ) -> Result<Vec<TourSummary>, ApplicationError> {
+        let rows = sqlx::query_as::<_, TourSummaryRow>(
+            r#"
+            SELECT t.id, t.tour_date, COUNT(d.id) AS delivery_count
+            FROM tours t
+            LEFT JOIN deliveries d ON d.tour_id = t.id
+            WHERE t.account_id = $1 AND t.tour_date = $2
+            GROUP BY t.id, t.tour_date
+            ORDER BY t.tour_date
+            "#,
+        )
+        .bind(personalnummer)
+        .bind(today)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?;
+
+        Ok(rows
+            .into_iter()
+            .map(|r| TourSummary {
+                tour_id: r.id,
+                tour_date: r.tour_date,
+                delivery_count: r.delivery_count,
+            })
+            .collect())
+    }
+
+    async fn find_details_by_id(
+        &self,
+        tour_id: Uuid,
+    ) -> Result<Option<TourDetails>, ApplicationError> {
+        // 1. Tour selbst
+        let Some(tour_row) = sqlx::query_as::<_, TourRow>(
+            "SELECT id, account_id, tour_date, synced_at FROM tours WHERE id = $1",
+        )
+        .bind(tour_id)
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(db)?
+        else {
+            return Ok(None);
+        };
+        let tour = map_tour(tour_row);
+
+        // 2. Lieferungen
+        let delivery_rows = sqlx::query_as::<_, DeliveryRow>(
+            r#"
+            SELECT
+                id, tour_id, erp_belegart_id, erp_belegnummer, customer_id,
+                snap_street, snap_house_number, snap_postal_code, snap_city, snap_country,
+                assigned_car_id, desired_time, special_agreements,
+                state, state_reason, sort_order
+            FROM deliveries
+            WHERE tour_id = $1
+            ORDER BY sort_order, erp_belegnummer
+            "#,
+        )
+        .bind(tour_id)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?;
+
+        let delivery_ids: Vec<Uuid> = delivery_rows.iter().map(|d| d.id).collect();
+
+        // 3. Kontakt-Person-Verknüpfungen
+        let contact_links = sqlx::query_as::<_, ContactLinkRow>(
+            r#"
+            SELECT delivery_id, customer_contact_id
+            FROM delivery_contact_persons
+            WHERE delivery_id = ANY($1)
+            "#,
+        )
+        .bind(&delivery_ids)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?;
+
+        let mut contacts_per_delivery: HashMap<Uuid, Vec<Uuid>> = HashMap::new();
+        for link in contact_links {
+            contacts_per_delivery
+                .entry(link.delivery_id)
+                .or_default()
+                .push(link.customer_contact_id);
+        }
+
+        // 4. Positionen
+        let item_rows = sqlx::query_as::<_, DeliveryItemRow>(
+            r#"
+            SELECT
+                id, delivery_id, article_id, required_quantity, warehouse_id,
+                belegzeilen_nr, komponenten_artikel_nr,
+                scanned_quantity, scan_status, held_reason, scan_last_updated_at
+            FROM delivery_items
+            WHERE delivery_id = ANY($1)
+            ORDER BY delivery_id, belegzeilen_nr, komponenten_artikel_nr NULLS FIRST
+            "#,
+        )
+        .bind(&delivery_ids)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?;
+
+        let mut items_per_delivery: HashMap<Uuid, Vec<DeliveryItem>> = HashMap::new();
+        let mut article_ids = std::collections::BTreeSet::new();
+        let mut warehouse_ids = std::collections::BTreeSet::new();
+        for row in item_rows {
+            article_ids.insert(row.article_id);
+            warehouse_ids.insert(row.warehouse_id);
+            let delivery_id = row.delivery_id;
+            let item = map_item(row)?;
+            items_per_delivery
+                .entry(delivery_id)
+                .or_default()
+                .push(item);
+        }
+
+        // 5. Lieferungen + Items kombinieren
+        let mut customer_ids = std::collections::BTreeSet::new();
+        let mut deliveries = Vec::with_capacity(delivery_rows.len());
+        for row in delivery_rows {
+            customer_ids.insert(row.customer_id);
+            let delivery_id = row.id;
+            let contact_ids = contacts_per_delivery.remove(&delivery_id).unwrap_or_default();
+            let items = items_per_delivery.remove(&delivery_id).unwrap_or_default();
+            let (delivery, sort_order) = map_delivery(row, contact_ids)?;
+            deliveries.push(DeliveryWithItems {
+                delivery,
+                sort_order,
+                items,
+            });
+        }
+
+        // 6. Lookup-Stammdaten
+        let customer_ids_vec: Vec<Uuid> = customer_ids.into_iter().collect();
+        let customers = sqlx::query_as::<_, CustomerRow>(
+            r#"
+            SELECT id, erp_customer_id, name, street, house_number, postal_code, city, country
+            FROM customers
+            WHERE id = ANY($1)
+            ORDER BY name
+            "#,
+        )
+        .bind(&customer_ids_vec)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?
+        .into_iter()
+        .map(map_customer)
+        .collect::<Vec<_>>();
+
+        let customer_contacts = sqlx::query_as::<_, CustomerContactRow>(
+            r#"
+            SELECT id, customer_id, name, phone, email
+            FROM customer_contacts
+            WHERE customer_id = ANY($1)
+            ORDER BY name
+            "#,
+        )
+        .bind(&customer_ids_vec)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?
+        .into_iter()
+        .map(map_contact)
+        .collect::<Vec<_>>();
+
+        let article_ids_vec: Vec<Uuid> = article_ids.into_iter().collect();
+        let articles = sqlx::query_as::<_, ArticleRow>(
+            r#"
+            SELECT id, article_number, name, scannable, default_warehouse_id
+            FROM articles
+            WHERE id = ANY($1)
+            ORDER BY article_number
+            "#,
+        )
+        .bind(&article_ids_vec)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?
+        .into_iter()
+        .map(map_article)
+        .collect::<Vec<_>>();
+
+        let warehouse_ids_vec: Vec<Uuid> = warehouse_ids.into_iter().collect();
+        let warehouses = sqlx::query_as::<_, WarehouseRow>(
+            r#"
+            SELECT id, code, name, is_standard
+            FROM warehouses
+            WHERE id = ANY($1)
+            ORDER BY code
+            "#,
+        )
+        .bind(&warehouse_ids_vec)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?
+        .into_iter()
+        .map(map_warehouse)
+        .collect::<Vec<_>>();
+
+        // 7. Notizen aller Lieferungen dieser Tour.
+        let notes = sqlx::query_as::<_, DeliveryNoteRow>(
+            r#"
+            SELECT id, delivery_id, text, image_attachment,
+                   author_personalnummer, author_car_id, created_at
+            FROM delivery_notes
+            WHERE delivery_id = ANY($1)
+            ORDER BY delivery_id, created_at
+            "#,
+        )
+        .bind(&delivery_ids)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(db)?
+        .into_iter()
+        .map(map_note)
+        .collect::<Vec<_>>();
+
+        Ok(Some(TourDetails {
+            tour,
+            deliveries,
+            customers,
+            customer_contacts,
+            articles,
+            warehouses,
+            notes,
+        }))
+    }
+
+    async fn set_delivery_order(
+        &self,
+        tour_id: Uuid,
+        delivery_ids: &[Uuid],
+    ) -> Result<Vec<DeliveryOrderEntry>, ApplicationError> {
+        let mut tx = self.pool.begin().await.map_err(db)?;
+
+        // 1. Lock alle Lieferungen dieser Tour. Liefert leer, wenn Tour
+        //    nicht existiert oder keine Lieferungen hat.
+        let existing: Vec<Uuid> = sqlx::query_scalar(
+            "SELECT id FROM deliveries WHERE tour_id = $1 FOR UPDATE",
+        )
+        .bind(tour_id)
+        .fetch_all(&mut *tx)
+        .await
+        .map_err(db)?;
+
+        if existing.is_empty() {
+            tx.rollback().await.map_err(db)?;
+            return Err(ApplicationError::NotFound);
+        }
+
+        // 2. Mengen-Match: Input muss exakt der Tour entsprechen.
+        let existing_set: std::collections::HashSet<Uuid> = existing.iter().copied().collect();
+        let input_set: std::collections::HashSet<Uuid> = delivery_ids.iter().copied().collect();
+        if existing_set != input_set {
+            tx.rollback().await.map_err(db)?;
+            let fremde: Vec<Uuid> =
+                input_set.difference(&existing_set).copied().collect();
+            let fehlende: Vec<Uuid> =
+                existing_set.difference(&input_set).copied().collect();
+            return Err(ApplicationError::Validation(format!(
+                "delivery_ids match nicht zur tour (fehlende: {fehlende:?}, fremde: {fremde:?})"
+            )));
+        }
+
+        // 3. Bulk-Update via UNNEST.
+        let positions: Vec<i32> = (1..=delivery_ids.len() as i32).collect();
+        sqlx::query(
+            r#"
+            UPDATE deliveries AS d
+            SET sort_order = data.new_order
+            FROM (
+                SELECT UNNEST($1::uuid[]) AS id,
+                       UNNEST($2::int[])  AS new_order
+            ) AS data
+            WHERE d.id = data.id
+            "#,
+        )
+        .bind(delivery_ids)
+        .bind(&positions)
+        .execute(&mut *tx)
+        .await
+        .map_err(db)?;
+
+        tx.commit().await.map_err(db)?;
+
+        Ok(delivery_ids
+            .iter()
+            .zip(positions.iter())
+            .map(|(id, pos)| DeliveryOrderEntry {
+                delivery_id: *id,
+                sort_order: *pos,
+            })
+            .collect())
+    }
+
+    async fn upsert_from_sync(
+        &self,
+        request: &SyncTourRequest,
+    ) -> Result<Uuid, ApplicationError> {
+        let mut tx = self.pool.begin().await.map_err(db)?;
+
+        // 1. Tour upserten — Identität: (account_id, tour_date)
+        let tour_id: Uuid = sqlx::query_scalar(
+            r#"
+            INSERT INTO tours (account_id, tour_date)
+            VALUES ($1, $2)
+            ON CONFLICT (account_id, tour_date) DO UPDATE
+                SET synced_at = now()
+            RETURNING id
+            "#,
+        )
+        .bind(request.driver_personalnummer)
+        .bind(request.tour_date)
+        .fetch_one(&mut *tx)
+        .await
+        .map_err(db)?;
+
+        for delivery in &request.deliveries {
+            // 2. Kunde upserten — Identität: erp_customer_id
+            let customer_id = upsert_customer(&mut tx, delivery).await?;
+
+            // 3. Lieferung upserten — Identität: (belegart_id, belegnummer).
+            //    Bestehende Lieferung bleibt mit ihrem state/cancellation
+            //    erhalten; nur Stammdaten + sort_order werden refresht.
+            let delivery_id = upsert_delivery(&mut tx, tour_id, customer_id, delivery).await?;
+
+            for item in &delivery.items {
+                let warehouse_id = upsert_warehouse(&mut tx, item).await?;
+                let article_id = upsert_article(&mut tx, item, warehouse_id).await?;
+                upsert_delivery_item(&mut tx, delivery_id, article_id, warehouse_id, item).await?;
+            }
+        }
+
+        tx.commit().await.map_err(db)?;
+        Ok(tour_id)
+    }
+}
+
+// ===== Upsert-Helfer =====================================================
+
+async fn upsert_warehouse(
+    tx: &mut Transaction<'_, Postgres>,
+    item: &SyncDeliveryItem,
+) -> Result<Uuid, ApplicationError> {
+    let id: Uuid = sqlx::query_scalar(
+        r#"
+        INSERT INTO warehouses (code, name)
+        VALUES ($1, $2)
+        ON CONFLICT (code) DO UPDATE
+            SET name = EXCLUDED.name
+        RETURNING id
+        "#,
+    )
+    .bind(&item.warehouse_code)
+    .bind(&item.warehouse_name)
+    .fetch_one(&mut **tx)
+    .await
+    .map_err(db)?;
+    Ok(id)
+}
+
+async fn upsert_article(
+    tx: &mut Transaction<'_, Postgres>,
+    item: &SyncDeliveryItem,
+    fallback_warehouse_id: Uuid,
+) -> Result<Uuid, ApplicationError> {
+    // Optional: explizites Default-Lager aus dem ERP. Wenn nicht
+    // geliefert, nehmen wir das Lager dieser Position als Default — das
+    // ist eine pragmatische Wahl, die wir später korrigieren können.
+    let default_warehouse_id = if let Some(code) = &item.article_default_warehouse_code {
+        sqlx::query_scalar::<_, Uuid>("SELECT id FROM warehouses WHERE code = $1")
+            .bind(code)
+            .fetch_optional(&mut **tx)
+            .await
+            .map_err(db)?
+            .unwrap_or(fallback_warehouse_id)
+    } else {
+        fallback_warehouse_id
+    };
+
+    let id: Uuid = sqlx::query_scalar(
+        r#"
+        INSERT INTO articles (article_number, name, scannable, default_warehouse_id)
+        VALUES ($1, $2, $3, $4)
+        ON CONFLICT (article_number) DO UPDATE
+            SET name                 = EXCLUDED.name,
+                scannable            = EXCLUDED.scannable,
+                default_warehouse_id = EXCLUDED.default_warehouse_id
+        RETURNING id
+        "#,
+    )
+    .bind(&item.article_number)
+    .bind(&item.article_name)
+    .bind(item.article_scannable)
+    .bind(default_warehouse_id)
+    .fetch_one(&mut **tx)
+    .await
+    .map_err(db)?;
+    Ok(id)
+}
+
+async fn upsert_customer(
+    tx: &mut Transaction<'_, Postgres>,
+    delivery: &SyncDelivery,
+) -> Result<Uuid, ApplicationError> {
+    let id: Uuid = sqlx::query_scalar(
+        r#"
+        INSERT INTO customers (
+            erp_customer_id, name, street, house_number, postal_code, city, country
+        ) VALUES ($1, $2, $3, $4, $5, $6, $7)
+        ON CONFLICT (erp_customer_id) DO UPDATE SET
+            name         = EXCLUDED.name,
+            street       = EXCLUDED.street,
+            house_number = EXCLUDED.house_number,
+            postal_code  = EXCLUDED.postal_code,
+            city         = EXCLUDED.city,
+            country      = EXCLUDED.country
+        RETURNING id
+        "#,
+    )
+    .bind(delivery.erp_customer_id)
+    .bind(&delivery.customer_name)
+    .bind(&delivery.customer_address.street)
+    .bind(&delivery.customer_address.house_number)
+    .bind(&delivery.customer_address.postal_code)
+    .bind(&delivery.customer_address.city)
+    .bind(&delivery.customer_address.country)
+    .fetch_one(&mut **tx)
+    .await
+    .map_err(db)?;
+    Ok(id)
+}
+
+async fn upsert_delivery(
+    tx: &mut Transaction<'_, Postgres>,
+    tour_id: Uuid,
+    customer_id: Uuid,
+    delivery: &SyncDelivery,
+) -> Result<Uuid, ApplicationError> {
+    let id: Uuid = sqlx::query_scalar(
+        r#"
+        INSERT INTO deliveries (
+            tour_id, erp_belegart_id, erp_belegnummer, customer_id,
+            snap_street, snap_house_number, snap_postal_code, snap_city, snap_country,
+            sort_order, desired_time, special_agreements
+        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12)
+        ON CONFLICT (erp_belegart_id, erp_belegnummer) DO UPDATE SET
+            tour_id            = EXCLUDED.tour_id,
+            customer_id        = EXCLUDED.customer_id,
+            snap_street        = EXCLUDED.snap_street,
+            snap_house_number  = EXCLUDED.snap_house_number,
+            snap_postal_code   = EXCLUDED.snap_postal_code,
+            snap_city          = EXCLUDED.snap_city,
+            snap_country       = EXCLUDED.snap_country,
+            sort_order         = EXCLUDED.sort_order,
+            desired_time       = EXCLUDED.desired_time,
+            special_agreements = EXCLUDED.special_agreements
+        RETURNING id
+        "#,
+    )
+    .bind(tour_id)
+    .bind(delivery.belegart_id)
+    .bind(&delivery.belegnummer)
+    .bind(customer_id)
+    .bind(&delivery.delivery_address.street)
+    .bind(&delivery.delivery_address.house_number)
+    .bind(&delivery.delivery_address.postal_code)
+    .bind(&delivery.delivery_address.city)
+    .bind(&delivery.delivery_address.country)
+    .bind(delivery.sort_order)
+    .bind(delivery.desired_time.as_deref())
+    .bind(delivery.special_agreements.as_deref())
+    .fetch_one(&mut **tx)
+    .await
+    .map_err(db)?;
+    Ok(id)
+}
+
+async fn upsert_delivery_item(
+    tx: &mut Transaction<'_, Postgres>,
+    delivery_id: Uuid,
+    article_id: Uuid,
+    warehouse_id: Uuid,
+    item: &SyncDeliveryItem,
+) -> Result<(), ApplicationError> {
+    // Identität: (delivery_id, belegzeilen_nr, komponenten_artikel_nr).
+    // scan_state-Felder bleiben beim UPDATE bewusst unberührt — das ERP
+    // weiß nichts über Scans.
+    sqlx::query(
+        r#"
+        INSERT INTO delivery_items (
+            delivery_id, article_id, required_quantity, warehouse_id,
+            belegzeilen_nr, komponenten_artikel_nr
+        ) VALUES ($1, $2, $3, $4, $5, $6)
+        ON CONFLICT (delivery_id, belegzeilen_nr, komponenten_artikel_nr) DO UPDATE SET
+            article_id        = EXCLUDED.article_id,
+            required_quantity = EXCLUDED.required_quantity,
+            warehouse_id      = EXCLUDED.warehouse_id
+        "#,
+    )
+    .bind(delivery_id)
+    .bind(article_id)
+    .bind(item.required_quantity)
+    .bind(warehouse_id)
+    .bind(item.belegzeilen_nr)
+    .bind(item.komponenten_artikel_nr.as_deref())
+    .execute(&mut **tx)
+    .await
+    .map_err(db)?;
+    Ok(())
+}