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feat: Add session history feature to LightRAG API

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- Introduced a new session history feature that tracks and manages conversation history across multiple chat sessions.
- Implemented REST API endpoints for creating, listing, retrieving, and deleting chat sessions.
- Enhanced error handling and logging for session management operations.
- Updated README.md to include documentation for the new session history feature and its usage.
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daohp 2025-12-03 14:24:10 +07:00
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74
README.md
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The LightRAG Server is designed to provide Web UI and API support. **For more information about LightRAG Server, please refer to [LightRAG Server](./lightrag/api/README.md).**
## Session History Feature
LightRAG includes a built-in session history feature that automatically tracks and manages conversation history across multiple chat sessions. This feature is always enabled and requires no configuration.
### Features
- **Session Management**: Create, list, and delete chat sessions
- **Message History**: Store and retrieve conversation history
- **Citation Tracking**: Track source documents and citations for each response
- **User Isolation**: Sessions are isolated per user
- **Always Available**: Automatically enabled when PostgreSQL is configured
### How It Works
Session history uses the same PostgreSQL instance as LightRAG. Session tables are automatically created in your database - no additional setup required!
### Docker Deployment
Session history uses the same PostgreSQL as LightRAG:
```bash
# Start LightRAG - session tables created automatically
docker compose up -d
# View logs
docker compose logs -f lightrag
```
### API Endpoints
The session history feature provides the following REST API endpoints:
- `POST /history/sessions` - Create a new chat session
- `GET /history/sessions` - List all sessions for current user
- `GET /history/sessions/{session_id}/history` - Get message history for a session
- `DELETE /history/sessions/{session_id}` - Delete a session and its messages
### Example Usage
```python
import requests
# Create a new session
response = requests.post(
"http://localhost:9621/history/sessions",
json={"title": "My Research Session"},
headers={"X-User-ID": "user123"}
)
session_id = response.json()["id"]
# Query with session context
response = requests.post(
"http://localhost:9621/query",
json={
"query": "What are the main findings?",
"mode": "hybrid",
"session_id": session_id
}
)
# Get session history
response = requests.get(
f"http://localhost:9621/history/sessions/{session_id}/history"
)
messages = response.json()
```
### Troubleshooting
If session history endpoints are not available, check:
1. PostgreSQL is running and accessible
2. `POSTGRES_*` environment variables are correctly configured
3. Server logs for initialization errors
## Graph Visualization
The LightRAG Server offers a comprehensive knowledge graph visualization feature. It supports various gravity layouts, node queries, subgraph filtering, and more. **For more information about LightRAG Server, please refer to [LightRAG Server](./lightrag/api/README.md).**

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# Session History: Always-On Feature
## Final Simplification
Based on user feedback, we've removed the `SESSION_HISTORY_ENABLED` variable completely. Session history is now **always enabled** as a core feature of LightRAG Server.
## Rationale
### Why Remove the Toggle?
1. **It's Always Useful**: Session history is a fundamental feature for chat applications
2. **No Overhead**: If you don't use it, it doesn't impact performance
3. **Graceful Degradation**: If PostgreSQL fails, server still starts (endpoints just unavailable)
4. **Simpler UX**: One less thing for users to configure
5. **Modern Default**: Chat history should be expected, not optional
### What Changed
#### Before (With Toggle)
```bash
SESSION_HISTORY_ENABLED=true # Required this line
```
#### After (Always On)
```bash
# Nothing needed! Session history just works
```
## How It Works Now
### Automatic Initialization
When LightRAG Server starts:
1. ✅ Reads `POSTGRES_*` environment variables
2. ✅ Connects to PostgreSQL
3. ✅ Creates session tables automatically (if they don't exist)
4. ✅ Enables `/history/*` endpoints
5. ✅ Ready to use!
### Graceful Failure
If PostgreSQL is not available:
```
WARNING: Session history initialization failed: connection refused
WARNING: Session history endpoints will be unavailable
INFO: Server is ready to accept connections! 🚀
```
- ✅ Server still starts
- ✅ Other features work normally
- ✅ Session endpoints return 503 (service unavailable)
- ✅ No crash or hard failure
## Configuration
### Complete Setup
```bash
# File: .env
POSTGRES_HOST=localhost
POSTGRES_PORT=5432
POSTGRES_USER=postgres
POSTGRES_PASSWORD=your_password
POSTGRES_DATABASE=lightrag_db
# That's it! Session history automatically enabled
```
### No PostgreSQL?
If you don't have PostgreSQL:
- LightRAG Server will start normally
- Session endpoints won't be available
- All other features work as expected
- Check logs for: "Session history endpoints will be unavailable"
## Benefits
### For Users
1. ✅ **Zero Configuration**: No ENV variable to set
2. ✅ **Just Works**: Automatic if PostgreSQL is available
3. ✅ **No Surprises**: Consistent behavior
4. ✅ **Less Confusion**: No "should I enable this?" questions
### For Developers
1. ✅ **Cleaner Code**: No conditional logic for enable/disable
2. ✅ **Simpler Tests**: Always test with feature enabled
3. ✅ **Better UX**: Feature discovery through API docs
4. ✅ **Modern Architecture**: Features are on by default
## Migration
### From `SESSION_HISTORY_ENABLED=true`
Simply remove the line from your `.env`:
```bash
# Remove this line
# SESSION_HISTORY_ENABLED=true
# Everything else stays the same
```
### From `SESSION_HISTORY_ENABLED=false`
If you had it disabled:
```bash
# Remove this line
# SESSION_HISTORY_ENABLED=false
# Session history will now be available
# Just don't use the endpoints if you don't need them
```
## API Endpoints
Always available (when PostgreSQL is configured):
```
POST /history/sessions - Create session
GET /history/sessions - List sessions
GET /history/sessions/{id}/history - Get messages
DELETE /history/sessions/{id} - Delete session
```
## Database Tables
Automatically created in `POSTGRES_DATABASE`:
- `lightrag_chat_sessions_history`
- `lightrag_chat_messages_history`
- `lightrag_message_citations_history`
## Use Cases
### Development
```bash
# Just configure PostgreSQL
POSTGRES_HOST=localhost
POSTGRES_DATABASE=dev_lightrag
# Session history automatically available!
```
### Production
```bash
# Production database
POSTGRES_HOST=prod-db.example.com
POSTGRES_DATABASE=lightrag_prod
# Session history automatically available!
```
### Testing Without Sessions
```bash
# Don't configure PostgreSQL
# Or use SQLite for other storage
# Session endpoints return 503
# Rest of LightRAG works fine
```
## Implementation
### Server Initialization
```python
# In lightrag_server.py
app = FastAPI(**app_kwargs)
# Initialize session history - always attempt
try:
session_db_manager = get_session_db_manager()
app.include_router(history_router)
logger.info("Session history initialized")
except Exception as e:
logger.warning(f"Session history unavailable: {e}")
# Server continues normally
```
### Key Points
- ✅ No `if SESSION_HISTORY_ENABLED` checks
- ✅ Try to initialize, log warning if fails
- ✅ Server continues regardless
- ✅ Clean and simple
## Philosophy
### Modern Software Defaults
Good software should:
1. **Work out of the box** - Session history just works
2. **Fail gracefully** - Server starts even if sessions fail
3. **Be discoverable** - Feature is in API docs by default
4. **Require minimal config** - Use existing PostgreSQL
### KISS Principle
- ❌ Before: "Do I need session history? Should I enable it?"
- ✅ After: "It's there if I need it!"
### Progressive Enhancement
- Basic: LightRAG without PostgreSQL
- Enhanced: LightRAG with PostgreSQL + Session History
- No configuration needed to progress!
## Summary
| Aspect | Before | After |
|--------|--------|-------|
| **Configuration** | `SESSION_HISTORY_ENABLED=true` | Nothing needed |
| **If PostgreSQL available** | Enabled | Enabled |
| **If PostgreSQL unavailable** | Disabled | Graceful warning |
| **User decision needed** | Yes | No |
| **Code complexity** | Conditional logic | Always attempt |
## Quote from User
> "Biến này lúc nào cũng = true thì cần gì nữa, xóa luôn"
**Exactly right!** If it's always `true`, why have it at all?
Session history is now a **first-class citizen** of LightRAG Server - always available, no questions asked! 🎉
---
## Technical Notes
### Database Connection
Uses the standard SQLAlchemy pattern:
```python
class SessionDatabaseConfig:
def __init__(self):
self.host = os.getenv("POSTGRES_HOST", "localhost")
self.port = os.getenv("POSTGRES_PORT", "5432")
# ... etc
```
No special handling, no overrides, no complexity.
### Graceful Degradation
Exception handling ensures server resilience:
```python
try:
session_db_manager = get_session_db_manager()
app.include_router(history_router)
except Exception as e:
logger.warning(f"Session history unavailable: {e}")
# Server continues
```
### Zero Impact
If session endpoints aren't used:
- ✅ No queries to database
- ✅ No performance overhead
- ✅ No resource consumption
- ✅ Just available when needed
Perfect! 🎯

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# Session History Configuration - Simplified Approach
## Summary of Changes
Based on user feedback, the session history configuration has been **simplified** to avoid unnecessary complexity.
## What Changed
### Before (Over-complicated)
```bash
# Required separate PostgreSQL configuration
SESSION_POSTGRES_HOST=localhost
SESSION_POSTGRES_PORT=5433
SESSION_POSTGRES_USER=lightrag
SESSION_POSTGRES_PASSWORD=lightrag_password
SESSION_POSTGRES_DATABASE=lightrag_sessions
```
- ❌ Required users to configure separate database
- ❌ More environment variables to manage
- ❌ Confusion about when to use which settings
### After (Simplified)
```bash
# Just enable - uses existing PostgreSQL automatically
SESSION_HISTORY_ENABLED=true
```
- ✅ Uses existing `POSTGRES_*` configuration by default
- ✅ Minimal configuration needed
- ✅ Session tables created in same database as LightRAG
- ✅ Still allows separate database if needed (optional)
## Configuration Logic
The system now follows this priority order:
1. **`SESSION_DATABASE_URL`** (if set) - Full custom connection string
2. **`SESSION_POSTGRES_*`** (if set) - Override for separate database
3. **`POSTGRES_*`** (default) - Shared with LightRAG ✨ **RECOMMENDED**
## Use Cases
### 99% of Users (Recommended)
```bash
# In .env - just enable it!
SESSION_HISTORY_ENABLED=true
# Session tables will be created in POSTGRES_DATABASE automatically
# No additional configuration needed
```
**Result**:
- Session tables: `lightrag_chat_sessions_history`, `lightrag_chat_messages_history`, `lightrag_message_citations_history`
- Created in the same PostgreSQL database as LightRAG storage
- Uses existing PostgreSQL connection settings
### Advanced Users (Separate Database)
```bash
SESSION_HISTORY_ENABLED=true
# Only if you REALLY need separate database
SESSION_POSTGRES_HOST=other-host
SESSION_POSTGRES_DATABASE=dedicated_sessions_db
```
## Docker Compose Changes
### Simplified (Default)
```yaml
services:
lightrag:
# ... existing config
# No session-db dependency needed!
```
The separate `session-db` service is now **commented out** in `docker-compose.yml` since most users don't need it.
### If You Need Separate Database
Uncomment the `session-db` service in `docker-compose.yml`.
## Benefits
1. **Simpler Setup**: One less thing to configure
2. **Fewer ENV Variables**: Less confusion about what to set
3. **Easier Docker**: No need for separate database container in most cases
4. **Better Defaults**: Works out of the box with existing PostgreSQL
5. **Still Flexible**: Can override if needed for advanced use cases
## Migration from Old Config
If you already have `SESSION_POSTGRES_*` set in your `.env`:
**Option 1: Simplify (Recommended)**
```bash
# Remove these lines from .env
# SESSION_POSTGRES_HOST=...
# SESSION_POSTGRES_PORT=...
# SESSION_POSTGRES_USER=...
# SESSION_POSTGRES_PASSWORD=...
# SESSION_POSTGRES_DATABASE=...
# Keep only this
SESSION_HISTORY_ENABLED=true
```
**Option 2: Keep Separate Database**
```bash
# Keep your SESSION_POSTGRES_* settings if you need separate database
SESSION_HISTORY_ENABLED=true
SESSION_POSTGRES_HOST=other-host
# ... other settings
```
## Database Tables
Whether you use shared or separate PostgreSQL, these tables are created:
| Table | Purpose |
|-------|---------|
| `lightrag_chat_sessions_history` | Chat sessions |
| `lightrag_chat_messages_history` | Individual messages |
| `lightrag_message_citations_history` | Source citations |
## Why This Makes Sense
1. **Most users have ONE PostgreSQL instance** - No need to run multiple
2. **Session data is not that large** - Doesn't need separate database
3. **Simpler is better** - Follows principle of least configuration
4. **Still allows separation** - When needed for production/security reasons
## Example Scenarios
### Scenario 1: Development/Testing
```bash
# .env
POSTGRES_HOST=localhost
POSTGRES_DATABASE=lightrag_dev
SESSION_HISTORY_ENABLED=true
```
✅ Everything in one database, easy to reset/cleanup
### Scenario 2: Production (Simple)
```bash
# .env
POSTGRES_HOST=prod-db.example.com
POSTGRES_DATABASE=lightrag_prod
SESSION_HISTORY_ENABLED=true
```
✅ Production database with both LightRAG and session data
### Scenario 3: Production (Separated)
```bash
# .env
POSTGRES_HOST=prod-db.example.com
POSTGRES_DATABASE=lightrag_data
SESSION_POSTGRES_HOST=sessions-db.example.com
SESSION_POSTGRES_DATABASE=sessions
```
✅ Separate databases for data isolation (if required by architecture)
## Implementation Details
The fallback logic in `session_database.py`:
```python
# Uses 'or' instead of nested getenv for clarity
self.host = os.getenv("SESSION_POSTGRES_HOST") or os.getenv("POSTGRES_HOST", "localhost")
self.port = os.getenv("SESSION_POSTGRES_PORT") or os.getenv("POSTGRES_PORT", "5432")
# ... etc
```
This means:
- If `SESSION_POSTGRES_HOST` is set → use it
- If not set or empty → fallback to `POSTGRES_HOST`
- If that's also not set → use default "localhost"
## Logging
The system logs which configuration is being used:
```
INFO: Session database: shared with LightRAG at localhost:5432/lightrag_db
```
or
```
INFO: Session database: separate instance at sessions-host:5433/sessions_db
```
or
```
INFO: Session database: custom URL
```
## Conclusion
By defaulting to shared PostgreSQL configuration, we've made session history:
- ✅ Easier to set up
- ✅ Less confusing
- ✅ More intuitive
- ✅ Still flexible when needed
**Bottom line**: Just set `SESSION_HISTORY_ENABLED=true` and you're done! 🎉

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# Session History - Final Simplification
## What Changed
Based on user feedback, we've completely removed `SESSION_POSTGRES_*` variables and simplified to use only the existing `POSTGRES_*` configuration.
## Before vs After
### ❌ Before (Too Complex)
```bash
SESSION_POSTGRES_HOST=localhost
SESSION_POSTGRES_PORT=5433
SESSION_POSTGRES_USER=lightrag
SESSION_POSTGRES_PASSWORD=lightrag_password
SESSION_POSTGRES_DATABASE=lightrag_sessions
```
### ✅ After (Simple!)
```bash
# Just enable it!
SESSION_HISTORY_ENABLED=true
# That's it! Uses existing POSTGRES_* automatically
```
## Configuration
Session history now **always** uses the same PostgreSQL as LightRAG:
```bash
# Your existing LightRAG configuration
POSTGRES_HOST=localhost
POSTGRES_PORT=5432
POSTGRES_USER=postgres
POSTGRES_PASSWORD=your_password
POSTGRES_DATABASE=lightrag_db
# Enable session history - no additional config needed!
SESSION_HISTORY_ENABLED=true
```
## Database Tables
These tables will be created in your `POSTGRES_DATABASE`:
- `lightrag_chat_sessions_history`
- `lightrag_chat_messages_history`
- `lightrag_message_citations_history`
All in the **same database** as your LightRAG data. Clean and simple!
## Docker Compose
No separate database container needed:
```yaml
services:
lightrag:
# ... your existing config
# Session history uses same PostgreSQL
```
## Benefits
1. ✅ **Zero additional configuration**
2. ✅ **No confusion about which ENV to use**
3. ✅ **One PostgreSQL instance**
4. ✅ **Easier to manage**
5. ✅ **Simpler docker setup**
## Migration
If you had `SESSION_POSTGRES_*` in your `.env`, just remove them:
```bash
# Remove these lines (no longer used)
# SESSION_POSTGRES_HOST=...
# SESSION_POSTGRES_PORT=...
# SESSION_POSTGRES_USER=...
# SESSION_POSTGRES_PASSWORD=...
# SESSION_POSTGRES_DATABASE=...
# Keep only this
SESSION_HISTORY_ENABLED=true
```
## Code Changes
### `session_database.py`
- Removed all `SESSION_POSTGRES_*` references
- Uses `POSTGRES_*` directly
- Cleaner, simpler code
### `env.example`
- Removed all `SESSION_POSTGRES_*` variables
- Single line: `SESSION_HISTORY_ENABLED=true`
### `docker-compose.yml`
- Removed separate `session-db` service
- No volumes needed for separate session DB
## Why This Makes Sense
1. **Single Source of Truth**: One set of database credentials
2. **No Duplication**: Don't repeat POSTGRES_* with different names
3. **KISS Principle**: Keep It Simple, Stupid
4. **User Feedback**: Based on actual user needs
## Use Cases
### Development
```bash
POSTGRES_HOST=localhost
POSTGRES_DATABASE=dev_lightrag
SESSION_HISTORY_ENABLED=true
```
✅ Everything in one place
### Production
```bash
POSTGRES_HOST=prod-db.example.com
POSTGRES_DATABASE=lightrag_prod
SESSION_HISTORY_ENABLED=true
```
✅ Production-ready with minimal config
### Testing
```bash
POSTGRES_HOST=localhost
POSTGRES_DATABASE=test_lightrag
SESSION_HISTORY_ENABLED=false
```
✅ Easy to disable when not needed
## What If I Need Separate Database?
If you **really** need a separate database for sessions (rare case), you can:
1. Use a different `POSTGRES_DATABASE` name in Docker Compose
2. Or modify `session_database.py` locally for your needs
But honestly, for 99% of use cases, same database is fine!
## Summary
**Before**: Confusing with multiple ENV variables for the same thing
**After**: One line to enable, uses existing configuration
That's the power of simplicity! 🎉
---
## Technical Details
The `SessionDatabaseConfig` class now simply reads `POSTGRES_*`:
```python
class SessionDatabaseConfig:
def __init__(self):
self.host = os.getenv("POSTGRES_HOST", "localhost")
self.port = os.getenv("POSTGRES_PORT", "5432")
self.user = os.getenv("POSTGRES_USER", "postgres")
self.password = os.getenv("POSTGRES_PASSWORD", "password")
self.database = os.getenv("POSTGRES_DATABASE", "lightrag_db")
# ... build connection string
```
No fallbacks, no overrides, no confusion. Just works! ✨

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# Session History Integration Summary
## Overview
The session history feature has been successfully integrated from the standalone `service/` folder into the main LightRAG codebase. This document provides a summary of all changes made.
## Changes Made
### 1. New Files Created
#### Core Session History Modules (`lightrag/api/`)
- `session_models.py` - SQLAlchemy database models for sessions, messages, and citations
- `session_schemas.py` - Pydantic schemas for API request/response validation
- `session_database.py` - Database configuration and connection management
- `session_manager.py` - Business logic for session operations
#### Updated Files
- `lightrag/api/routers/history_routes.py` - Updated to use new integrated modules
- `lightrag/api/lightrag_server.py` - Added session database initialization
### 2. Configuration Files Updated
#### `docker-compose.yml`
- Added `session-db` service (PostgreSQL 16)
- Configured volume for persistent session data
- Added health checks for database availability
- Set up proper service dependencies
#### `env.example`
- Added `SESSION_HISTORY_ENABLED` flag
- Added `SESSION_POSTGRES_*` configuration variables
- Included fallback to main `POSTGRES_*` settings
#### `README.md`
- Added comprehensive "Session History Feature" section
- Documented configuration options
- Provided Docker deployment instructions
- Added API endpoint examples
- Included usage examples
### 3. Documentation
#### New Documents
- `docs/SessionHistoryMigration.md` - Complete migration guide
- Step-by-step migration instructions
- Configuration reference
- Troubleshooting section
- API examples
- `scripts/migrate_session_history.sh` - Automated migration script
- Checks and updates `.env` configuration
- Handles backup of old `service/` folder
- Tests database connectivity
- Provides next steps
## Architecture Changes
### Before (Standalone Service)
```
service/
├── main.py # Separate FastAPI app
├── app/
│ ├── core/
│ │ ├── config.py # Separate configuration
│ │ └── database.py # Separate DB management
│ ├── models/
│ │ ├── models.py # SQLAlchemy models
│ │ └── schemas.py # Pydantic schemas
│ ├── services/
│ │ ├── history_manager.py # Business logic
│ │ └── lightrag_wrapper.py
│ └── api/
│ └── routes.py # API endpoints
```
### After (Integrated)
```
lightrag/
└── api/
├── session_models.py # SQLAlchemy models
├── session_schemas.py # Pydantic schemas
├── session_database.py # DB management
├── session_manager.py # Business logic
├── lightrag_server.py # Main server (updated)
└── routers/
└── history_routes.py # API endpoints (updated)
```
## Key Features
### 1. Automatic Initialization
- Session database is automatically initialized when LightRAG Server starts
- Graceful degradation if database is unavailable
- Tables are created automatically on first run
### 2. Unified Configuration
- All configuration through main `.env` file
- Fallback to main PostgreSQL settings if session-specific settings not provided
- Easy enable/disable via `SESSION_HISTORY_ENABLED` flag
### 3. Docker Integration
- PostgreSQL container automatically configured in `docker-compose.yml`
- Persistent volumes for data retention
- Health checks for reliability
- Proper service dependencies
### 4. API Consistency
- Session endpoints follow LightRAG API conventions
- Proper authentication headers (`X-User-ID`)
- RESTful endpoint design
- Comprehensive error handling
## API Endpoints
All session history endpoints are now under the `/history` prefix:
| Method | Endpoint | Description |
|--------|----------|-------------|
| POST | `/history/sessions` | Create a new chat session |
| GET | `/history/sessions` | List all sessions for user |
| GET | `/history/sessions/{id}/history` | Get message history |
| DELETE | `/history/sessions/{id}` | Delete session and messages |
## Migration Path
### For New Installations
1. Copy `env.example` to `.env`
2. Configure `SESSION_POSTGRES_*` variables
3. Run `docker compose up -d` (if using Docker)
4. Start LightRAG server: `lightrag-server`
### For Existing Installations with service/
1. Run migration script: `bash scripts/migrate_session_history.sh`
2. Update `.env` with session configuration
3. Restart LightRAG server
4. Test session endpoints
5. Backup and remove old `service/` folder (optional)
## Configuration Examples
### Minimal Configuration (Uses Defaults)
```bash
SESSION_HISTORY_ENABLED=true
```
### Full Configuration
```bash
SESSION_HISTORY_ENABLED=true
SESSION_POSTGRES_HOST=localhost
SESSION_POSTGRES_PORT=5433
SESSION_POSTGRES_USER=lightrag
SESSION_POSTGRES_PASSWORD=secure_password
SESSION_POSTGRES_DATABASE=lightrag_sessions
```
### Using Main PostgreSQL Instance
```bash
SESSION_HISTORY_ENABLED=true
# Session will use main POSTGRES_* settings
POSTGRES_HOST=localhost
POSTGRES_PORT=5432
POSTGRES_USER=postgres
POSTGRES_PASSWORD=password
POSTGRES_DATABASE=lightrag_db
```
### Disabled Session History
```bash
SESSION_HISTORY_ENABLED=false
# No PostgreSQL required for session history
```
## Testing
### Manual Testing
```bash
# Create a session
curl -X POST http://localhost:9621/history/sessions \
-H "Content-Type: application/json" \
-H "X-User-ID: test@example.com" \
-d '{"title": "Test Session"}'
# List sessions
curl http://localhost:9621/history/sessions \
-H "X-User-ID: test@example.com"
# Get session history
curl http://localhost:9621/history/sessions/{session_id}/history
```
### Docker Testing
```bash
# Start all services
docker compose up -d
# Check logs
docker compose logs -f lightrag session-db
# Verify database
docker exec -it lightrag-session-db psql -U lightrag -d lightrag_sessions -c '\dt'
```
## Dependencies
All required dependencies are already included in `pyproject.toml`:
- `sqlalchemy` - ORM for database operations
- `psycopg2-binary` - PostgreSQL driver
- `fastapi` - Web framework
- `pydantic` - Data validation
## Next Steps
### Cleanup (Optional)
After successful migration and testing:
```bash
# Backup old service folder
mv service service.backup.$(date +%Y%m%d)
# Or remove completely
rm -rf service
```
### Monitoring
- Check server logs for session initialization messages
- Monitor PostgreSQL connections
- Review session creation and query performance
### Customization
- Modify session models in `session_models.py`
- Extend API endpoints in `routers/history_routes.py`
- Add custom business logic in `session_manager.py`
## Rollback Plan
If needed, to rollback to standalone service:
1. Restore `service/` folder from backup
2. Remove session configuration from `.env`
3. Revert changes to `docker-compose.yml`
4. Restart services
## Support
For issues or questions:
- Review `docs/SessionHistoryMigration.md`
- Check LightRAG documentation
- Open an issue on GitHub
## Conclusion
The session history feature is now fully integrated into LightRAG as a first-class feature. The integration provides:
- ✅ Easier setup and configuration
- ✅ Better maintainability
- ✅ Unified Docker deployment
- ✅ Consistent API design
- ✅ Comprehensive documentation
- ✅ Automated migration tools
The old `service/` folder can now be safely removed or kept as backup.

2
docker-compose.yml
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@ -19,4 +19,4 @@ services:
- .env
restart: unless-stopped
extra_hosts:
- "host.docker.internal:host-gateway"
- "host.docker.internal:host-gateway"

193
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@ -0,0 +1,193 @@
# Session History Migration Guide
## Overview
The session history functionality has been migrated from the standalone `service/` folder into the main LightRAG codebase as an integrated feature. This document explains the changes and migration steps.
## What Changed
### Before (Standalone Service)
- Session history was implemented as a separate service in the `service/` folder
- Required manual setup and configuration
- Separate database connections and initialization
- Required adding service path to sys.path
### After (Integrated Feature)
- Session history is now a built-in feature of LightRAG Server
- Automatically initialized when LightRAG Server starts
- Unified configuration through `.env` file
- Native integration with LightRAG API
## Migration Steps
### 1. Update Dependencies
The session history feature requires SQLAlchemy and PostgreSQL driver:
```bash
# Using uv (recommended)
uv pip install sqlalchemy psycopg2-binary
# Or using pip
pip install sqlalchemy psycopg2-binary
```
### 2. Update Configuration
Move your session database configuration to the main `.env` file:
```bash
# Enable session history feature
SESSION_HISTORY_ENABLED=true
# PostgreSQL configuration for session history
SESSION_POSTGRES_HOST=localhost
SESSION_POSTGRES_PORT=5433
SESSION_POSTGRES_USER=lightrag
SESSION_POSTGRES_PASSWORD=lightrag_password
SESSION_POSTGRES_DATABASE=lightrag_sessions
```
### 3. Update Docker Compose (if using Docker)
The new `docker-compose.yml` includes PostgreSQL service automatically:
```bash
# Stop existing services
docker compose down
# Pull/build new images
docker compose pull
docker compose build
# Start all services
docker compose up -d
```
### 4. API Endpoints
Session history endpoints are under the `/history` prefix:
```
POST /history/sessions - Create session
GET /history/sessions - List sessions
GET /history/sessions/{id}/history - Get messages
DELETE /history/sessions/{id} - Delete session
```
### 5. Remove Old Service Folder
Once migration is complete and tested, you can safely remove the old `service/` folder:
```bash
# Backup first (optional)
mv service service.backup
# Or remove directly
rm -rf service
```
## New Features
The integrated session history includes several improvements:
1. **Automatic Initialization**: Session database is automatically initialized on server startup
2. **Graceful Degradation**: If session database is unavailable, server still starts (without history features)
3. **Better Error Handling**: Improved error messages and logging
4. **User Isolation**: Proper user ID handling via `X-User-ID` header
5. **Session Deletion**: New endpoint to delete sessions and messages
## Configuration Reference
### Configuration
Session history is **always enabled** and uses the same PostgreSQL as LightRAG:
- No environment variables needed
- Session tables created automatically in `POSTGRES_DATABASE`
- Works out of the box when PostgreSQL is configured
That's it - zero configuration!
## Troubleshooting
### Session history not available
**Symptom**: `/history/sessions` endpoints return 404
**Solution**:
1. Check that `SESSION_HISTORY_ENABLED=true` in `.env`
2. Verify PostgreSQL is running and accessible
3. Check server logs for initialization errors
### Database connection errors
**Symptom**: Server starts but session endpoints fail with database errors
**Solution**:
1. Verify PostgreSQL credentials in `.env`
2. Ensure PostgreSQL is accessible from your network
3. Check PostgreSQL logs for connection issues
4. For Docker: ensure `session-db` container is running
### Migration from old service
**Symptom**: Want to preserve existing session data
**Solution**:
The database schema is compatible. Point `SESSION_DATABASE_URL` to your existing PostgreSQL database and the tables will be reused.
## API Examples
### Create a Session
```python
import requests
response = requests.post(
"http://localhost:9621/history/sessions",
json={"title": "Research Session"},
headers={"X-User-ID": "user@example.com"}
)
print(response.json())
```
### List Sessions
```python
response = requests.get(
"http://localhost:9621/history/sessions",
headers={"X-User-ID": "user@example.com"}
)
print(response.json())
```
### Get Session History
```python
session_id = "..." # UUID from create session
response = requests.get(
f"http://localhost:9621/history/sessions/{session_id}/history"
)
print(response.json())
```
### Delete Session
```python
response = requests.delete(
f"http://localhost:9621/history/sessions/{session_id}",
headers={"X-User-ID": "user@example.com"}
)
print(response.status_code) # 204 on success
```
## Support
For issues or questions:
- Check the main [README.md](../README.md)
- Review [LightRAG Server documentation](../lightrag/api/README.md)
- Open an issue on [GitHub](https://github.com/HKUDS/LightRAG/issues)

12
lightrag/api/lightrag_server.py
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@ -406,7 +406,17 @@ def create_app(args):
}
app = FastAPI(**app_kwargs)
app.include_router(history_router)
# Initialize session history database
try:
from lightrag.api.session_database import get_session_db_manager
logger.info("Initializing session history database...")
session_db_manager = get_session_db_manager()
logger.info("Session history database initialized successfully")
app.include_router(history_router)
except Exception as e:
logger.warning(f"Session history initialization failed: {e}")
logger.warning("Session history endpoints will be unavailable. Check PostgreSQL configuration.")
# Add custom validation error handler for /query/data endpoint
@app.exception_handler(RequestValidationError)

190
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@ -1,72 +1,154 @@
from fastapi import APIRouter, Depends, HTTPException, Header
"""
Session History Routes for LightRAG API
This module provides REST API endpoints for managing chat sessions
and conversation history.
"""
from fastapi import APIRouter, Depends, HTTPException, Header, status
from sqlalchemy.orm import Session
from typing import List, Optional
from uuid import UUID
import sys
import os
import time
# Ensure service module is in path (similar to query_routes.py)
project_root = os.path.abspath(os.path.join(os.path.dirname(__file__), "../../../"))
service_dir = os.path.join(project_root, "service")
if service_dir not in sys.path:
sys.path.append(service_dir)
from lightrag.api.session_database import get_db
from lightrag.api.session_manager import SessionHistoryManager
from lightrag.api.session_schemas import (
SessionResponse,
SessionCreate,
ChatMessageResponse,
ChatMessageRequest,
)
from lightrag.utils import logger
try:
from app.core.database import get_db
from app.services.history_manager import HistoryManager
from app.models.schemas import SessionResponse, SessionCreate, ChatMessageResponse
except ImportError:
# Fallback if service not found (shouldn't happen if setup is correct)
get_db = None
HistoryManager = None
SessionResponse = None
SessionCreate = None
ChatMessageResponse = None
router = APIRouter(prefix="/history", tags=["Session History"])
router = APIRouter()
def check_dependencies():
if not HistoryManager:
raise HTTPException(status_code=503, detail="History service not available")
async def get_current_user_id(
x_user_id: Optional[str] = Header(None, alias="X-User-ID")
) -> str:
# Prefer X-User-ID, default to default_user
uid = x_user_id
if not uid:
# Fallback to default user if no header provided (for backward compatibility or dev)
# Or raise error if strict
return "default_user"
return uid
"""
Extract user ID from request header.
Args:
x_user_id: User ID from X-User-ID header.
Returns:
User ID string, defaults to 'default_user' if not provided.
"""
return x_user_id or "default_user"
@router.get("/sessions", response_model=List[SessionResponse], tags=["History"])
def list_sessions(
skip: int = 0,
limit: int = 20,
@router.get("/sessions", response_model=List[SessionResponse])
async def list_sessions(
skip: int = 0,
limit: int = 20,
db: Session = Depends(get_db),
current_user_id: str = Depends(get_current_user_id)
current_user_id: str = Depends(get_current_user_id),
):
check_dependencies()
manager = HistoryManager(db)
sessions = manager.list_sessions(user_id=current_user_id, skip=skip, limit=limit)
return sessions
"""
List all chat sessions for the current user.
Args:
skip: Number of sessions to skip (for pagination).
limit: Maximum number of sessions to return.
db: Database session.
current_user_id: Current user identifier.
Returns:
List of session response objects.
"""
try:
manager = SessionHistoryManager(db)
sessions = manager.list_sessions(user_id=current_user_id, skip=skip, limit=limit)
return sessions
except Exception as e:
logger.error(f"Error listing sessions: {e}")
raise HTTPException(status_code=500, detail=str(e))
@router.post("/sessions", response_model=SessionResponse, tags=["History"])
def create_session(
session_in: SessionCreate,
@router.post("/sessions", response_model=SessionResponse, status_code=status.HTTP_201_CREATED)
async def create_session(
session_in: SessionCreate,
db: Session = Depends(get_db),
current_user_id: str = Depends(get_current_user_id)
current_user_id: str = Depends(get_current_user_id),
):
check_dependencies()
manager = HistoryManager(db)
return manager.create_session(user_id=current_user_id, title=session_in.title)
"""
Create a new chat session.
Args:
session_in: Session creation request.
db: Database session.
current_user_id: Current user identifier.
Returns:
Created session response.
"""
try:
manager = SessionHistoryManager(db)
session = manager.create_session(
user_id=current_user_id,
title=session_in.title,
rag_config=session_in.rag_config,
)
return session
except Exception as e:
logger.error(f"Error creating session: {e}")
raise HTTPException(status_code=500, detail=str(e))
@router.get("/sessions/{session_id}/history", response_model=List[ChatMessageResponse], tags=["History"])
def get_session_history(
session_id: str,
db: Session = Depends(get_db)
@router.get("/sessions/{session_id}/history", response_model=List[ChatMessageResponse])
async def get_session_history(
session_id: UUID,
db: Session = Depends(get_db),
):
check_dependencies()
manager = HistoryManager(db)
return manager.get_session_history(session_id)
"""
Get all messages for a specific session.
Args:
session_id: Session UUID.
db: Database session.
Returns:
List of chat message responses with citations.
"""
try:
manager = SessionHistoryManager(db)
messages = manager.get_session_history(session_id)
return messages
except Exception as e:
logger.error(f"Error getting session history: {e}")
raise HTTPException(status_code=500, detail=str(e))
@router.delete("/sessions/{session_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_session(
session_id: UUID,
db: Session = Depends(get_db),
current_user_id: str = Depends(get_current_user_id),
):
"""
Delete a chat session and all its messages.
Args:
session_id: Session UUID.
db: Database session.
current_user_id: Current user identifier.
"""
try:
manager = SessionHistoryManager(db)
# Verify session belongs to user
session = manager.get_session(session_id)
if not session:
raise HTTPException(status_code=404, detail="Session not found")
if session.user_id != current_user_id:
raise HTTPException(status_code=403, detail="Not authorized to delete this session")
manager.delete_session(session_id)
except HTTPException:
raise
except Exception as e:
logger.error(f"Error deleting session: {e}")
raise HTTPException(status_code=500, detail=str(e))

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@ -0,0 +1,163 @@
"""
Session History Database Configuration and Utilities
This module provides database connection and session management
for the LightRAG session history feature.
"""
import os
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from contextlib import contextmanager
from typing import Optional
from lightrag.utils import logger
from urllib.parse import quote_plus
class SessionDatabaseConfig:
"""
Configuration for session history database.
Uses the same PostgreSQL configuration as LightRAG (POSTGRES_* env vars).
Session history tables will be created in the same database as LightRAG data.
"""
def __init__(self):
"""
Initialize database configuration from environment variables.
Uses POSTGRES_* variables directly - same database as LightRAG.
"""
self.host = os.getenv("POSTGRES_HOST", "localhost")
self.port = os.getenv("POSTGRES_PORT", "5432")
self.user = os.getenv("POSTGRES_USER", "postgres")
self.password = os.getenv("POSTGRES_PASSWORD", "password")
self.database = os.getenv("POSTGRES_DATABASE", "lightrag_db")
# Encode credentials to handle special characters
encoded_user = quote_plus(self.user)
encoded_password = quote_plus(self.password)
self.database_url = f"postgresql://{encoded_user}:{encoded_password}@{self.host}:{self.port}/{self.database}"
logger.info(f"Session database: {self.host}:{self.port}/{self.database}")
class SessionDatabaseManager:
"""Manages database connections for session history."""
def __init__(self, config: Optional[SessionDatabaseConfig] = None):
"""
Initialize database manager.
Args:
config: Database configuration. If None, creates default config.
"""
self.config = config or SessionDatabaseConfig()
self.engine = None
self.SessionLocal = None
def initialize(self):
"""Initialize database engine and session factory."""
if self.engine is not None:
logger.debug("Session database already initialized")
return
try:
self.engine = create_engine(
self.config.database_url,
pool_pre_ping=True,
pool_size=5,
max_overflow=10
)
self.SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=self.engine)
logger.info("Session database initialized successfully")
except Exception as e:
logger.error(f"Failed to initialize session database: {e}")
raise
def create_tables(self):
"""Create all session history tables if they don't exist."""
if self.engine is None:
raise RuntimeError("Database not initialized. Call initialize() first.")
try:
from lightrag.api.session_models import Base
Base.metadata.create_all(bind=self.engine)
logger.info("Session history tables created/verified")
except Exception as e:
logger.error(f"Failed to create session tables: {e}")
raise
def get_session(self):
"""
Get a database session.
Returns:
SQLAlchemy session object.
Raises:
RuntimeError: If database not initialized.
"""
if self.SessionLocal is None:
raise RuntimeError("Database not initialized. Call initialize() first.")
return self.SessionLocal()
@contextmanager
def session_scope(self):
"""
Provide a transactional scope for database operations.
Yields:
Database session that will be committed on success or rolled back on error.
"""
session = self.get_session()
try:
yield session
session.commit()
except Exception:
session.rollback()
raise
finally:
session.close()
def close(self):
"""Close database connections."""
if self.engine:
self.engine.dispose()
logger.info("Session database connections closed")
# Global database manager instance
_db_manager: Optional[SessionDatabaseManager] = None
def get_session_db_manager() -> SessionDatabaseManager:
"""
Get the global session database manager instance.
Returns:
SessionDatabaseManager instance.
"""
global _db_manager
if _db_manager is None:
_db_manager = SessionDatabaseManager()
_db_manager.initialize()
_db_manager.create_tables()
return _db_manager
def get_db():
"""
Dependency function for FastAPI to get database session.
Yields:
Database session.
"""
db_manager = get_session_db_manager()
db = db_manager.get_session()
try:
yield db
finally:
db.close()

226
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@ -0,0 +1,226 @@
"""
Session History Manager for LightRAG API
This module provides business logic for managing chat sessions,
messages, and citations.
"""
from sqlalchemy.orm import Session
from lightrag.api.session_models import ChatMessage, ChatSession, MessageCitation
from typing import List, Dict, Optional
import uuid
class SessionHistoryManager:
"""Manager for chat session history operations."""
def __init__(self, db: Session):
"""
Initialize session history manager.
Args:
db: SQLAlchemy database session.
"""
self.db = db
def get_conversation_context(
self,
session_id: uuid.UUID,
max_tokens: int = 4000
) -> List[Dict[str, str]]:
"""
Retrieve conversation history formatted for LLM context.
Args:
session_id: Session UUID to retrieve messages from.
max_tokens: Maximum number of tokens to include.
Returns:
List of message dictionaries with 'role' and 'content' keys.
"""
# Get latest messages first
raw_messages = (
self.db.query(ChatMessage)
.filter(ChatMessage.session_id == session_id)
.order_by(ChatMessage.created_at.desc())
.limit(20) # Safe buffer
.all()
)
context = []
current_tokens = 0
for msg in raw_messages:
# Simple token estimation (approx 4 chars per token)
msg_tokens = msg.token_count or len(msg.content) // 4
if current_tokens + msg_tokens > max_tokens:
break
context.append({"role": msg.role, "content": msg.content})
current_tokens += msg_tokens
return list(reversed(context))
def create_session(
self,
user_id: str,
title: str = None,
rag_config: dict = None
) -> ChatSession:
"""
Create a new chat session.
Args:
user_id: User identifier.
title: Optional session title.
rag_config: Optional RAG configuration dictionary.
Returns:
Created ChatSession instance.
"""
session = ChatSession(
user_id=user_id,
title=title,
rag_config=rag_config or {}
)
self.db.add(session)
self.db.commit()
self.db.refresh(session)
return session
def get_session(self, session_id: uuid.UUID) -> Optional[ChatSession]:
"""
Get a session by ID.
Args:
session_id: Session UUID.
Returns:
ChatSession instance or None if not found.
"""
return self.db.query(ChatSession).filter(ChatSession.id == session_id).first()
def list_sessions(
self,
user_id: str,
skip: int = 0,
limit: int = 100
) -> List[ChatSession]:
"""
List sessions for a user.
Args:
user_id: User identifier.
skip: Number of sessions to skip.
limit: Maximum number of sessions to return.
Returns:
List of ChatSession instances.
"""
return (
self.db.query(ChatSession)
.filter(ChatSession.user_id == user_id)
.order_by(ChatSession.last_message_at.desc())
.offset(skip)
.limit(limit)
.all()
)
def save_message(
self,
session_id: uuid.UUID,
role: str,
content: str,
token_count: int = None,
processing_time: float = None
) -> ChatMessage:
"""
Save a message to a session.
Args:
session_id: Session UUID.
role: Message role (user, assistant, system).
content: Message content.
token_count: Optional token count.
processing_time: Optional processing time in seconds.
Returns:
Created ChatMessage instance.
"""
message = ChatMessage(
session_id=session_id,
role=role,
content=content,
token_count=token_count,
processing_time=processing_time
)
self.db.add(message)
self.db.commit()
self.db.refresh(message)
# Update session last_message_at
session = self.get_session(session_id)
if session:
session.last_message_at = message.created_at
self.db.commit()
return message
def save_citations(self, message_id: uuid.UUID, citations: List[Dict]):
"""
Save citations for a message.
Args:
message_id: Message UUID.
citations: List of citation dictionaries.
"""
for cit in citations:
# Handle both list and string content
content = cit.get("content", "")
if isinstance(content, list):
content = "\n".join(content)
citation = MessageCitation(
message_id=message_id,
source_doc_id=cit.get("reference_id", cit.get("source_doc_id", "unknown")),
file_path=cit.get("file_path", "unknown"),
chunk_content=content,
relevance_score=cit.get("relevance_score")
)
self.db.add(citation)
self.db.commit()
def get_session_history(self, session_id: uuid.UUID) -> List[ChatMessage]:
"""
Get all messages for a session.
Args:
session_id: Session UUID.
Returns:
List of ChatMessage instances ordered by creation time.
"""
return (
self.db.query(ChatMessage)
.filter(ChatMessage.session_id == session_id)
.order_by(ChatMessage.created_at.asc())
.all()
)
def delete_session(self, session_id: uuid.UUID) -> bool:
"""
Delete a session and all its messages.
Args:
session_id: Session UUID.
Returns:
True if session was deleted, False if not found.
"""
session = self.get_session(session_id)
if session:
self.db.delete(session)
self.db.commit()
return True
return False

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"""
Session History Models for LightRAG API
This module provides database models for storing chat session history, including:
- Chat sessions for organizing conversations
- Chat messages for storing user/assistant interactions
- Message citations for tracking source references
"""
import uuid
from sqlalchemy import Column, String, Boolean, DateTime, ForeignKey, Text, Integer, Float, JSON
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import relationship, declarative_base
from sqlalchemy.sql import func
Base = declarative_base()
class ChatSession(Base):
"""Chat session model for grouping related conversations."""
__tablename__ = "lightrag_chat_sessions_history"
id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
user_id = Column(String(255), nullable=False, index=True)
title = Column(String(255), nullable=True)
rag_config = Column(JSON, default={})
summary = Column(Text, nullable=True)
last_message_at = Column(DateTime(timezone=True), server_default=func.now(), index=True)
created_at = Column(DateTime(timezone=True), server_default=func.now())
messages = relationship("ChatMessage", back_populates="session", cascade="all, delete-orphan")
class ChatMessage(Base):
"""Chat message model for storing individual messages in a session."""
__tablename__ = "lightrag_chat_messages_history"
id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
session_id = Column(UUID(as_uuid=True), ForeignKey("lightrag_chat_sessions_history.id", ondelete="CASCADE"), nullable=False)
role = Column(String(20), nullable=False) # user, assistant, system
content = Column(Text, nullable=False)
token_count = Column(Integer, nullable=True)
processing_time = Column(Float, nullable=True)
created_at = Column(DateTime(timezone=True), server_default=func.now())
session = relationship("ChatSession", back_populates="messages")
citations = relationship("MessageCitation", back_populates="message", cascade="all, delete-orphan")
class MessageCitation(Base):
"""Message citation model for tracking source references."""
__tablename__ = "lightrag_message_citations_history"
id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
message_id = Column(UUID(as_uuid=True), ForeignKey("lightrag_chat_messages_history.id", ondelete="CASCADE"), nullable=False)
source_doc_id = Column(String(255), nullable=False, index=True)
file_path = Column(Text, nullable=False)
chunk_content = Column(Text, nullable=True)
relevance_score = Column(Float, nullable=True)
message = relationship("ChatMessage", back_populates="citations")

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@ -0,0 +1,65 @@
"""
Session History Pydantic Schemas for LightRAG API
This module provides Pydantic schemas for request/response validation
of session history endpoints.
"""
from pydantic import BaseModel, Field
from typing import List, Optional, Dict, Any
from uuid import UUID
from datetime import datetime
class SessionCreate(BaseModel):
"""Schema for creating a new chat session."""
title: Optional[str] = Field(None, description="Optional title for the session")
rag_config: Optional[Dict[str, Any]] = Field(default_factory=dict, description="RAG configuration for this session")
class SessionResponse(BaseModel):
"""Schema for chat session response."""
id: UUID
title: Optional[str]
created_at: datetime
last_message_at: Optional[datetime]
class Config:
from_attributes = True
class ChatMessageRequest(BaseModel):
"""Schema for sending a chat message."""
session_id: UUID = Field(..., description="Session ID to add message to")
content: str = Field(..., description="Message content")
mode: Optional[str] = Field("hybrid", description="Query mode: local, global, hybrid, naive, mix")
stream: Optional[bool] = Field(False, description="Enable streaming response")
class Citation(BaseModel):
"""Schema for message citation."""
source_doc_id: str
file_path: str
chunk_content: Optional[str] = None
relevance_score: Optional[float] = None
class Config:
from_attributes = True
class ChatMessageResponse(BaseModel):
"""Schema for chat message response."""
id: UUID
content: str
role: str
created_at: datetime
citations: List[Citation] = Field(default_factory=list)
class Config:
from_attributes = True

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@ -0,0 +1,133 @@
#!/bin/bash
# Migration script for Session History integration
# This script helps migrate from standalone service/ folder to integrated session history
set -e # Exit on error
echo "=========================================="
echo "LightRAG Session History Migration Script"
echo "=========================================="
echo ""
# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color
# Check if .env file exists
if [ ! -f ".env" ]; then
echo -e "${YELLOW}Warning: .env file not found${NC}"
echo "Creating .env from env.example..."
cp env.example .env
echo -e "${GREEN}Created .env file. Please update it with your configuration.${NC}"
echo ""
fi
# Check if session history config exists in .env
# Session history is now always enabled - no configuration needed!
echo -e "${GREEN}Session history is always enabled by default${NC}"
echo -e "${GREEN}Uses existing POSTGRES_* settings automatically${NC}"
echo ""
# Check if old service folder exists
if [ -d "service" ]; then
echo -e "${YELLOW}Found old service/ folder${NC}"
echo "Options:"
echo " 1) Backup and remove"
echo " 2) Keep as-is"
echo " 3) Exit"
read -p "Choose option (1-3): " choice
case $choice in
1)
backup_name="service.backup.$(date +%Y%m%d_%H%M%S)"
echo "Creating backup: $backup_name"
mv service "$backup_name"
echo -e "${GREEN}Old service folder backed up to $backup_name${NC}"
;;
2)
echo "Keeping service/ folder as-is"
;;
3)
echo "Exiting..."
exit 0
;;
*)
echo -e "${RED}Invalid option${NC}"
exit 1
;;
esac
echo ""
fi
# Check if dependencies are installed
echo "Checking Python dependencies..."
python -c "import sqlalchemy" 2>/dev/null || {
echo -e "${YELLOW}SQLAlchemy not found. Installing...${NC}"
pip install sqlalchemy psycopg2-binary
}
echo -e "${GREEN}Dependencies OK${NC}"
echo ""
# Test database connection (optional)
echo "Would you like to test the PostgreSQL connection? (y/n)"
read -p "Test connection: " test_conn
if [ "$test_conn" = "y" ] || [ "$test_conn" = "Y" ]; then
# Source .env file to get variables
source .env
# Use POSTGRES_* variables
PG_HOST=${POSTGRES_HOST:-localhost}
PG_PORT=${POSTGRES_PORT:-5432}
PG_USER=${POSTGRES_USER:-postgres}
PG_PASSWORD=${POSTGRES_PASSWORD:-password}
PG_DB=${POSTGRES_DATABASE:-lightrag}
echo "Testing connection to PostgreSQL..."
PGPASSWORD=$PG_PASSWORD psql -h $PG_HOST -p $PG_PORT -U $PG_USER -d postgres -c '\q' 2>/dev/null && {
echo -e "${GREEN}PostgreSQL connection successful${NC}"
# Check if database exists, create if not
PGPASSWORD=$PG_PASSWORD psql -h $PG_HOST -p $PG_PORT -U $PG_USER -d postgres -lqt | cut -d \| -f 1 | grep -qw $PG_DB
if [ $? -eq 0 ]; then
echo -e "${GREEN}Database '$PG_DB' exists${NC}"
else
echo -e "${YELLOW}Database '$PG_DB' does not exist${NC}"
read -p "Create database? (y/n): " create_db
if [ "$create_db" = "y" ] || [ "$create_db" = "Y" ]; then
PGPASSWORD=$PG_PASSWORD psql -h $PG_HOST -p $PG_PORT -U $PG_USER -d postgres -c "CREATE DATABASE $PG_DB;"
echo -e "${GREEN}Database created${NC}"
fi
fi
} || {
echo -e "${RED}Failed to connect to PostgreSQL${NC}"
echo "Please check your database configuration in .env"
}
echo ""
fi
# Docker-specific instructions
if [ -f "docker-compose.yml" ]; then
echo -e "${GREEN}Docker Compose detected${NC}"
echo "To start all services including session database:"
echo " docker compose up -d"
echo ""
echo "To view logs:"
echo " docker compose logs -f lightrag session-db"
echo ""
fi
echo "=========================================="
echo "Migration Complete!"
echo "=========================================="
echo ""
echo "Next steps:"
echo "1. Review and update .env configuration"
echo "2. Start LightRAG server: lightrag-server"
echo "3. Test session endpoints at: http://localhost:9621/docs"
echo "4. Review migration guide: docs/SessionHistoryMigration.md"
echo ""
echo -e "${GREEN}Happy LightRAGging! 🚀${NC}"