Memora Knowledge Base

Memora - Personal AI Knowledge Base

Memora is a self-hosted personal AI knowledge base system that provides an integrated experience from knowledge capture to intelligent Q&A. Built on vector retrieval, hybrid search, and LLM-driven intelligent organization, it helps you efficiently manage, retrieve, and utilize your personal knowledge assets.

Version History

v2.1.0 (Current)

• 🕸️ Knowledge Graph Full Build: Entity extraction now processes all text chunks (removed 10-chunk limit)
• 🗑️ Document Deletion Consistency: Soft delete and purge now sync cleanup Neo4j graph data
• 🔧 Entity ID Fix: Resolved missing entity_id issue causing node loss in graph queries
• ⚡ Performance Optimization: Removed MySQL consistency check during queries, moved to deletion time
• 📦 Directory Restructure: Renamed skill directory to memora-knowledge-base for ClawHub compatibility

v2.0.4

• 📝 Complete Product Documentation: Comprehensive README with full product overview
• 🎨 Knowledge Graph v2.0: Preview + Fullscreen Modal architecture
• 🖱️ Enhanced Interactions: Zoom, pan, drag, hover details
• 🎯 Centered Layout: Force-directed algorithm with origin-centered positioning
• 🔄 Smart Caching: Preview data cached, modal uses larger dataset
• Dual Views: Document graph + Entity graph

v2.0.0

• Initial release with knowledge graph visualization
• Force-directed layout with interactive controls
• Obsidian-inspired visual design

Core Features

🔐 Privacy & Local Deployment

• Fully Private: Data stored locally, no third-party uploads
• Offline Ready: Works without internet connection
• Single User Mode: No authentication required, ready to use out of the box

Intelligent Semantic Retrieval

• Hybrid Search: Dense vectors + BM42 sparse vectors dual-engine retrieval
• Relevance Reranking: Optional Rerank model for secondary sorting
• Fallback Mechanism: Automatic fallback to backup strategies
• Semantic Understanding: Vector similarity-based, not keyword matching

📄 Multi-Format Document Processing

• Supported Formats: PDF, Word (.docx/.doc), Plain Text (.txt), Markdown (.md)
• Smart Chunking: LangChain recursive character splitter with Chinese/English support
• Vector Storage: Dense + sparse vectors stored in Qdrant
• Metadata Management: Tags and custom metadata for organization

AI-Powered Q&A

• Two Interaction Modes:
  • Knowledge Query: Precise Q&A based on retrieved results
  • Knowledge Organization: LLM automatically organizes and summarizes knowledge
• Streaming Output: Real-time content generation
• Session Management: Multi-turn conversations with history
• Source Attribution: Answers include source document links

🕸️ Knowledge Graph Visualization

• Force-Directed Layout: Automatic node positioning forming natural network structure
• Dual View Display: Document relationship graph + Entity relationship graph
• Interactive Operations:
  • Mouse wheel zoom (centered on cursor)
  • Drag blank area to pan canvas
  • Drag nodes to reposition
  • Hover to show details
• Obsidian Style Design: Black nodes, white background, subtle connections

🌐 Web Scraping & Integration

• Built-in Crawler: httpx + BeautifulSoup, no external dependencies
• OpenClaw Integration: Available as AI Agent Skill with zero-dependency client
• RESTful API: Easy integration with other systems

Quick Start

Installation via clawhub

openclaw skills install memora-knowledge-graph@2.0.4

Manual Installation

# Clone repository
git clone https://github.com/zzlzzlzzl15/Memora.git
cd Memora/personal_knowledge_base

# Run installation script
./install.sh

Docker Compose Deployment (Recommended)

# Clone repository
git clone https://github.com/zzlzzlzzl15/Memora.git
cd Memora/personal_knowledge_base

# Configure environment variables
cp .env.example .env
# Edit .env with your API keys

# Start services
docker-compose up -d

# Access application
# Open http://localhost:8080 in browser

Configuration

Set the KB_API_BASE environment variable to point to your Memora backend:

export KB_API_BASE=http://127.0.0.1:8080

Or create a .env file:

KB_API_BASE=http://127.0.0.1:8080

Required Environment Variables

Optional Environment Variables

Usage Examples

Upload Documents

1. Click "Upload Document" button in left sidebar
2. Select file (PDF, DOCX, TXT, MD supported)
3. Fill in title and tags (optional)
4. Click "Upload" - system automatically parses, chunks, and vectorizes

Ask Questions

1. Enter question in right-side chat interface
2. Choose interaction mode:
   • Knowledge Query: Get precise answers based on retrieval
   • Knowledge Organization: Let AI organize and summarize related knowledge
3. View answer with cited source documents

Browse Knowledge Graph

1. Click "Knowledge Graph" button in top navigation
2. View two preview cards:
   • Document Relationship Graph: Shows connections between documents
   • Entity Relationship Graph: Shows extracted entities and relationships
3. Click any card to enter fullscreen modal for interactive exploration:
   • Scroll to zoom
   • Drag to pan
   • Drag nodes to reposition
   • Hover for details

Manage Documents

• View List: See all documents in left sidebar
• Search: Use quick search function
• Recycle Bin: View and manage deleted documents (recoverable within 30 days)
• Permanent Delete: Permanently remove documents and vector data

Technical Architecture

┌─────────────────────────────────────────┐
│           Web Browser                    │
│     (Frontend UI - HTML/CSS/JS)         │
└──────────────┬──────────────────────────┘
               │ HTTP / WebSocket
┌──────────────▼──────────────────────────┐
│         Memora Backend                   │
│       (FastAPI / Python)                │
──────────┬──────────────┬───────────────┤
│ Document │  Retrieval   │ AI Services   │
│Processing│   Engine     │               │
├──────────┼──────────────┼───────────────┤
│• PDF     │• Dense Vector│• Embedding    │
│  Parser  │  Search      │  (DashScope/  │
│• DOCX    │• Sparse Vector│  Local ST)   │
│  Parse   │  (BM42)      │• LLM Chat     │
│• Text    │• Hybrid Search│  (DeepSeek/  │
│  Split   │• Fallback     │  OpenAI Comp)│
│• Metadata│  Logic       │• Rerank       │
│• Upload  │              │  (Qwen3)      │
│  API     │              │• Stream       │
│          │              │  Response     │
└────┬─────┴──────┬───────┴───────┬───────┘
     │            │               │
┌────▼────┐ ┌────▼──────┐ ┌──────▼──────┐
│ MySQL   │ │  Qdrant   │ │ External    │
│(Metadata)│ │(Vector DB)│ │ APIs        │
│         │ │           │ │             │
│• Docs   │ │• Dense    │ │• DashScope  │
│• Users  │ │  Vectors  │ │• DeepSeek   │
│• Sessions│ │• Sparse   │ │• OpenAI     │
│• History │ │  (BM42)   │ │ Compatible  │
└─────────┘ └───────────┘ └─────────────┘

Tech Stack

Troubleshooting

Issue: Preview cards not showing

Solution: Check browser console for errors. Ensure initKnowledgeGraph() is called after DOM ready.

Issue: Nodes not centered

Solution: Hard refresh page (Cmd+Shift+R). Clear browser cache if needed.

Issue: Cannot drag/zoom in modal

Solution: Verify setInteractive(true) is called for fullscreen visualizer. Check console logs.

Issue: Service won't start

Solution:

# Check logs
docker-compose logs -f app

# Clean and restart
docker-compose down -v
docker-compose up -d

Issue: Document upload fails

Solution:

• Check file format (PDF, DOCX, TXT, MD only)
• Check file size (default limit: 10MB)
• Review application logs: docker-compose logs -f app

Issue: No retrieval results

Solution:

• Confirm documents are uploaded and vectorized
• Try different query terms
• Lower QDRANT_DENSE_DEFAULT_THRESHOLD value

Issue: LLM call fails

Solution:

# Check API key configuration
cat .env | grep API_KEY

# Test API connectivity
curl -H "Authorization: Bearer $DEEPSEEK_API_KEY" \
  https://api.deepseek.com/v1/chat/completions \
  -d '{"model":"deepseek-chat","messages":[{"role":"user","content":"test"}]}'

Performance Tips

1. Limit Node Count: Use smaller limits for previews (50-80 nodes)
2. Cache Data: Reuse fetched data instead of reloading
3. Debounce Resize: Add debounce to window resize handler
4. Reduce Iterations: Lower iterations in initForceLayout() for faster load (default: 150)
5. Optimize Rendering: Skip rendering during rapid mouse movements

Browser Compatibility

• ✅ Chrome 90+
• ✅ Firefox 88+
• ✅ Safari 14+
• ✅ Edge 90+

Requires:

• Canvas 2D API
• CSS backdrop-filter
• ES6+ JavaScript features

Contributing

Contributions welcome! Please:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Make your changes
4. Commit your changes (git commit -m 'Add amazing feature')
5. Push to the branch (git push origin feature/amazing-feature)
6. Submit a pull request

Support

For issues and questions:

• GitHub Issues: https://github.com/zzlzzlzzl15/Memora/issues
• Email: support@memora.dev
• Documentation: https://github.com/zzlzzlzzl15/Memora/blob/main/personal_knowledge_base/README.md

Acknowledgments

• Inspired by Obsidian graph view
• Built for Memora personal knowledge base
• Uses force-directed layout algorithm similar to D3.js force simulation
• References RAG-Anything for multimodal RAG architecture

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Made with ❤️ by zzlzzlzzl15

Memora - Your Personal AI Knowledge Base