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# Checkpointer: PostgresSaver

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**PostgresSaver**: Persistencia en PostgreSQL (producción)

```bash
npm install @langchain/langgraph-checkpoint-postgres
```

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```typescript
import { createAgent } from "langchain";
import { PostgresSaver } from "@langchain/langgraph-checkpoint-postgres";

const DB_URI = "postgresql://user:pass@localhost:5432/mydb";
const checkpointer = PostgresSaver.fromConnString(DB_URI);
await checkpointer.setup();

const agent = createAgent({
  model: "mistral:mistral-large-latest",
  tools: [weatherTool],
  checkpointer,
});
```

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También disponibles: **MongoDB** (`@langchain/langgraph-checkpoint-mongodb`),
**Redis** (`@langchain/langgraph-checkpoint-redis`), y **Custom** (implementar `BaseCheckpointSaver`)
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