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---
title: Resumen
description: "Da forma a los datos que tu aplicación agrega a un espacio de trabajo: objetos, campos y relaciones."
icon: database
---
La **capa de datos** de una aplicación de Twenty es el conjunto de datos que tu aplicación *agrega* a un espacio de trabajo — los nuevos tipos de registros que declara, las columnas que agrega a los objetos existentes y cómo esos registros se conectan entre sí.
```text
┌──────────────────────────────────────────────────┐
│ Object — a record type, e.g. PostCard │
│ ├─ Field (name, type, label) │
│ ├─ Field │
│ └─ Relation (link to another object) │
└──────────────────────────────────────────────────┘
│
├── lives in your app, OR
│
▼
┌──────────────────────────────────────────────────┐
│ Standard / other apps' objects │
│ └─ Field added by your app via defineField │
└──────────────────────────────────────────────────┘
```
## En esta sección
<CardGroup cols={2}>
<Card title="Objetos" icon="table" href="/l/es/developers/extend/apps/data/objects">
`defineObject` — declara nuevos tipos de registros con sus propios campos.
</Card>
<Card title="Extender objetos" icon="wand-magic-sparkles" href="/l/es/developers/extend/apps/data/extending-objects">
`defineField` — agrega campos a objetos estándar o de otras aplicaciones.
</Card>
<Card title="Relaciones" icon="diagram-project" href="/l/es/developers/extend/apps/data/relations">
Conexiones bidireccionales `MANY_TO_ONE` / `ONE_TO_MANY` entre objetos.
</Card>
<Card title="Tipos de actividad de la cronología" icon="clock-rotate-left" href="/l/es/developers/extend/apps/data/timeline-activity-types">
Defina eventos de auditoría automáticos y eventos explícitos de la aplicación para cronologías de registros.
</Card>
</CardGroup>
## Entidades de un vistazo
| Entidad | Propósito | Definido con |
| -------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------- |
| **Objeto** | Un nuevo tipo de registro personalizado (por ejemplo, PostCard, Invoice) con sus propios campos | `defineObject()` |
| **Campo** | Una columna en un objeto. Los campos independientes pueden ampliar objetos que no creaste (por ejemplo, agregar `loyaltyTier` a Company) | `defineField()` |
| **Relación** | Un vínculo bidireccional entre dos objetos: ambos lados se declaran como campos | `defineField()` con `FieldType.RELATION` |
| **Índice** | Un índice de base de datos para acelerar una consulta recurrente sobre uno de tus objetos | `defineIndex()` |
| **Tipo de actividad de la cronología** | Un evento de auditoría automático o un evento de dominio explícito mostrado en las líneas de tiempo de los registros. | `defineTimelineActivityType()` |
El SDK detecta estos mediante análisis AST en tiempo de compilación, por lo que la organización de archivos depende de ti; la convención es `src/objects/`, `src/fields/`, `src/indexes/` y `src/timeline-activity-types/`. Los UUID `universalIdentifier` estables vinculan todo a través de los despliegues.
## Índices (opcional)
Las aplicaciones pueden incluir índices junto con sus objetos para mantener rápidas las consultas recurrentes. El caso más habitual es una columna de estado o de clave externa que lees con frecuencia.
```ts src/indexes/post-card-status.index.ts
import { defineIndex } from 'twenty-sdk/define';
import {
POST_CARD_UNIVERSAL_IDENTIFIER,
STATUS_FIELD_UNIVERSAL_IDENTIFIER,
} from '../objects/post-card.object';
export default defineIndex({
universalIdentifier: 'b6e9d2a1-5a4c-46ca-9d52-42c8f02d1ff0',
objectUniversalIdentifier: POST_CARD_UNIVERSAL_IDENTIFIER,
fields: [
{
universalIdentifier: 'b6e9d2a1-5a4c-46ca-9d52-42c8f02d1ff1',
fieldUniversalIdentifier: STATUS_FIELD_UNIVERSAL_IDENTIFIER,
},
],
});
```
### Índices únicos
`defineIndex` acepta `isUnique: true` tanto para unicidad de una sola columna como de varias columnas. Este es el elemento primitivo recomendado — `defineField({ isUnique: true })` está obsoleto y se eliminará en una versión futura.
```ts
defineIndex({
universalIdentifier: '…',
objectUniversalIdentifier: PERSON_UNIVERSAL_IDENTIFIER,
isUnique: true,
fields: [{ universalIdentifier: '…', fieldUniversalIdentifier: EMAIL_FIELD_UNIVERSAL_IDENTIFIER }],
});
```
### Otras restricciones
* Las cláusulas `WHERE` parciales permanecen bajo el control del administrador: las aplicaciones no pueden declararlas.
* Cada objeto está limitado a 10 índices personalizados (los índices propios del framework no cuentan).
Ordena el arreglo `fields` de la forma en que Postgres debería usarlo: la columna más a la izquierda primero, como en una guía telefónica. Los índices no son gratuitos: cada escritura en la tabla los actualiza. Añade uno solo cuando tengas una consulta que lo necesite.
<Note>
¿Buscas **Application Config** o **Roles & Permissions**? Esos describen la propia aplicación en lugar de los datos que agrega; se encuentran en [Config](/l/es/developers/extend/apps/config/overview). ¿Buscas **Connections** (Linear, GitHub, Slack OAuth)? Estas existen para ser llamadas *desde* las funciones lógicas y se encuentran en [Logic](/l/es/developers/extend/apps/logic/connections).
</Note>