> ## Documentation Index
> Fetch the complete documentation index at: https://docs.upsonic.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Storage Backends

> Persistence options for Chat sessions

## Available Backends

* **InMemoryStorage**: Ephemeral (default)
* **SqliteStorage**: SQLite database
* **PostgresStorage**: PostgreSQL
* **MongoStorage**: MongoDB
* **RedisStorage**: Redis with TTL
* **JSONStorage**: File-based JSON

## SQLite Storage

```python theme={null}
import asyncio
from upsonic import Agent, Chat
from upsonic.storage import SqliteStorage


async def main():
    storage = SqliteStorage(db_file="chat.db")
    agent = Agent("anthropic/claude-sonnet-4-5")

    chat = Chat(
        session_id="session1",
        user_id="user1",
        agent=agent,
        storage=storage
    )

    response = await chat.invoke("Hello")
    print(response)


if __name__ == "__main__":
    asyncio.run(main())
```

## PostgreSQL Storage

```python theme={null}
import asyncio
from upsonic import Agent, Chat
from upsonic.storage import PostgresStorage


async def main():
    storage = PostgresStorage(
        db_url="postgresql://user:pass@localhost:5432/dbname"
    )
    agent = Agent("anthropic/claude-sonnet-4-5")

    chat = Chat(
        session_id="session1",
        user_id="user1",
        agent=agent,
        storage=storage
    )

    response = await chat.invoke("Hello")
    print(response)


if __name__ == "__main__":
    asyncio.run(main())
```

## MongoDB Storage

```python theme={null}
import asyncio
from upsonic import Agent, Chat
from upsonic.storage import MongoStorage


async def main():
    storage = MongoStorage(
        db_url="mongodb://localhost:27017",
        db_name="chat_db"
    )
    agent = Agent("anthropic/claude-sonnet-4-5")

    chat = Chat(
        session_id="session1",
        user_id="user1",
        agent=agent,
        storage=storage
    )

    response = await chat.invoke("Hello")
    print(response)


if __name__ == "__main__":
    asyncio.run(main())
```

## Redis Storage

```python theme={null}
import asyncio
from upsonic import Agent, Chat
from upsonic.storage import RedisStorage


async def main():
    storage = RedisStorage(
        db_url="redis://localhost:6379/0",
        db_prefix="chat",
        expire=3600
    )
    agent = Agent("anthropic/claude-sonnet-4-5")

    chat = Chat(
        session_id="session1",
        user_id="user1",
        agent=agent,
        storage=storage
    )

    response = await chat.invoke("Hello")
    print(response)


if __name__ == "__main__":
    asyncio.run(main())
```

## JSON Storage

```python theme={null}
import asyncio
from upsonic import Agent, Chat
from upsonic.storage import JSONStorage


async def main():
    storage = JSONStorage(db_path="./chat_data")
    agent = Agent("anthropic/claude-sonnet-4-5")

    chat = Chat(
        session_id="session1",
        user_id="user1",
        agent=agent,
        storage=storage
    )

    response = await chat.invoke("Hello")
    print(response)


if __name__ == "__main__":
    asyncio.run(main())
```