implemented the history retention feature

### 1. __History Retention Configuration__

- __config.toml__: Added `[HISTORY]` section with `RETENTION_DAYS = 30` setting
- __Backend Integration__: Updated configuration handling to support history retention
- __API Endpoints__: Modified `/api/config` to read/write history retention settings

### 2. __User Interface__

- __Settings Page__: Added "History Settings" section with number input for retention days
- __Real-time Updates__: Settings are saved to config.toml when changed
- __Clear Documentation__: Explains that retention only applies when incognito mode is off

### 3. __Automatic History Cleanup__

- __Background Processing__: Cleanup runs automatically when new chats are created (non-incognito mode)
- __Smart Logic__: Only deletes chats older than configured retention period
- __Complete Cleanup__: Removes both chat records and associated messages
- __Performance Optimized__: Non-blocking background execution

### 4. __Manual Cleanup API__

- __Endpoint__: `POST /api/cleanup-history` for manual cleanup triggers
- __Utility Functions__: Reusable cleanup logic in dedicated utility file

### 5. __Docker Rebuild__

- __Container Rebuild__: Successfully rebuilt the Docker containers with new features
- __Configuration Persistence__: config.toml changes are preserved in Docker volume
- __Application Ready__: The application should now be accessible at [](http://localhost:3000)<http://localhost:3000>

## Key Features:

1. __Incognito Mode Integration__: History retention only applies when incognito mode is OFF
2. __Flexible Configuration__: 0 = keep forever, any positive number = days to retain
3. __Automatic Cleanup__: Runs in background when creating new chats
4. __Manual Control__: API endpoint for manual cleanup triggers
5. __Database Integrity__: Properly removes both chats and associated messages

## Testing the Feature:

1. __Access the Application__: Open [](http://localhost:3000)<http://localhost:3000> in your browser
2. __Configure Settings__: Go to Settings → History Settings → Set retention days
3. __Test Incognito Mode__: Toggle incognito mode on/off to see different behaviors
4. __Create Test Chats__: Create chats in both modes to verify functionality
5. __Manual Cleanup__: Use the `/api/cleanup-history` endpoint to test manual cleanup

src/lib/config.ts

@@ -16,6 +16,9 @@ interface Config {
     SIMILARITY_MEASURE: string;
     KEEP_ALIVE: string;
   };
+  HISTORY: {
+    RETENTION_DAYS: number;
+  };
   MODELS: {
     OPENAI: {
       API_KEY: string;
@@ -70,6 +73,8 @@ export const getSimilarityMeasure = () =>
 
 export const getKeepAlive = () => loadConfig().GENERAL.KEEP_ALIVE;
 
+export const getHistoryRetentionDays = () => loadConfig().HISTORY.RETENTION_DAYS;
+
 export const getOpenaiApiKey = () => loadConfig().MODELS.OPENAI.API_KEY;
 
 export const getGroqApiKey = () => loadConfig().MODELS.GROQ.API_KEY;