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---
title: Übersicht
description: Konfigurieren Sie die App selbst – ihre Identität, Standardberechtigungen und das, was zur Installationszeit ausgeführt wird.
icon: screwdriver-wrench
---
Die **Konfigurationsebene** einer Twenty-App beschreibt die App *für die Plattform* – ihre Identität, die Berechtigungen, die sie hält, und den Code, der während der Installation oder Aktualisierung ausgeführt wird. Diese Deklarationen fügen keine neuen Datentypen oder Laufzeitverhalten hinzu; sie teilen Twenty mit, *wer die App ist* und *wie sie eingerichtet werden soll*.
```text
┌────────────────────────────────────────────────────────┐
│ Application — identity, default role, variables, │
│ marketplace metadata │
│ │
│ ┌──────────────────────────────────────────────────┐ │
│ │ Role — what the app's logic functions can read │ │
│ │ and write (referenced by Application) │ │
│ └──────────────────────────────────────────────────┘ │
└────────────────────────────────────────────────────────┘
│
▼ (at install / upgrade time)
┌──────────────────────────────────┐
│ Pre-install hook │ before metadata migration
└──────────────────────────────────┘
┌──────────────────────────────────┐
│ Post-install hook │ after metadata migration
└──────────────────────────────────┘
│
▼ (at uninstall time)
┌──────────────────────────────────┐
│ Uninstall hook │ before app removal
└──────────────────────────────────┘
```
## In diesem Abschnitt
<CardGroup cols={2}>
<Card title="App-Konfiguration" icon="rocket" href="/l/de/developers/extend/apps/config/application">
`defineApplication` – Identität, Standardrolle, Variablen, Marketplace-Metadaten.
</Card>
<Card title="Rollen & Berechtigungen" icon="shield-halved" href="/l/de/developers/extend/apps/config/roles">
`defineRole` – deklariert, was die Logikfunktionen Ihrer App lesen und schreiben können.
</Card>
<Card title="Installations-Hooks" icon="wrench" href="/l/de/developers/extend/apps/config/install-hooks">
`definePreInstallLogicFunction`, `definePostInstallLogicFunction` und `defineUninstallLogicFunction` – Daten sichern, Standardwerte befüllen, Aktualisierungen validieren, beim Entfernen aufräumen.
</Card>
</CardGroup>
## Wie die Bausteine zusammenhängen
* **Application** ist der Einstiegspunkt. Jede App hat genau einen `defineApplication()`-Aufruf, und dieser verweist auf eine **Rolle** als Standard.
* Die **Rolle** steuert, was die Logikfunktionen und Frontend-Komponenten der App lesen und schreiben können. Folgen Sie dem Prinzip der geringsten Privilegien: Gewähren Sie nur die Berechtigungen, die Ihr Code tatsächlich benötigt.
* **Install Hooks** laufen während der Installation oder Aktualisierung – Pre-Install vor der Metadatenmigration (so kann ein riskantes Upgrade abgelehnt werden), Post-Install nach der Migration (so können Standarddaten gegen das neue Schema befüllt werden). Der Uninstall-Hook wird direkt ausgeführt, bevor die App entfernt wird, sodass er externe Ressourcen bereinigen kann, während die Daten der App noch lesbar sind.
<Note>
Installations-Hooks nutzen die Laufzeit der [Logikfunktion](/l/de/developers/extend/apps/logic/logic-functions) – gleiche Handler-Signatur, gleiche Umgebungsvariablen, gleicher typisierter API-Client –, werden aber mit ihren eigenen Define-Funktionen deklariert und leben außerhalb des regulären Trigger-Modells (HTTP, Cron, Datenbankereignisse).
</Note>