Help: adk api_server Not Persisting Sessions to SQLite Database from Front End

## Problem (tried so many thing, I feel like I am missing something..)

I've set up an ADK agent with a DatabaseSessionService pointing to a SQLite database. My React frontend successfully creates sessions and communicates with the backend. While the API server is running, everything works fine, but sessions aren't persisting when the server restarts.

## Code Setup

**backend/agent_module/agent.py**:

from google.adk.sessions import DatabaseSessionService

# Database setup

db_url = "sqlite:///./my-sqlite-database.db"

session_service = DatabaseSessionService(db_url=db_url)

```

**backend/agent_module/__init__.py**:

from . import agent, session_service

# and tried it just the usual direclty

from . import agent

#both same results no difference

```

**frontend/src/components/Chat.tsx** (relevant parts):

```typescript

// API endpoints for the ADK API server

const api = {

// Create a new session with optional initial state

session: (userId: string, initialState?: Record<string, unknown>) =>

fetch(`/apps/agent_module/users/${userId}/sessions`, {

method: 'POST',

headers: { 'Content-Type': 'application/json' },

body: JSON.stringify({ state: initialState })

}).then(r => r.json() as Promise<{ id: string }>),

// Other API endpoints...

}

// Creating a session

const createNewSession = async () => {

// Load initial state from files...

// Create the session with initial state

const { id } = await api.session(userId, initialState);

console.log("Created session with ID:", id);

setSessionId(id);

}

```

## Observations

1. When running `adk api_server` from the parent directory, the frontend successfully connects

2. When I send a message, the SQLite file is created successfully

3. Sessions can be created and used while the server is running

4. Debug code shows the DatabaseSessionService is initialized correctly:

```

Created DatabaseSessionService with URL: sqlite:///./my-sqlite-database.db

Session service type: <class 'google.adk.sessions.database_session_service.DatabaseSessionService'>

```

5. When the API server is restarted, all sessions are lost

## Question

How do I ensure the ADK API server uses my DatabaseSessionService instance from agent.py to handle session requests from the frontend? Is there a specific way to register a custom session service with the API server so it SAVES to my actual SqLite?

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