Tiger SQL

PostgreSQL Schema Visualizer & Designer with AI-Powered Assistance
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🎯 Overview

Tiger SQL is a powerful, modern PostgreSQL schema visualizer and designer that combines intuitive visual design with AI-powered assistance enhanced by the Model Context Protocol (MCP). Built with Next.js 15 and React 19, it offers a seamless experience for designing, visualizing, and managing database schemas without requiring any installations or sensitive credentials.

🔌 MCP Integration (Model Context Protocol)

Tiger SQL now features a scalable, multi-server MCP architecture that provides the AI assistant with up-to-date PostgreSQL knowledge and best practices:

🧠 PostgreSQL Expertise - Access to official PostgreSQL documentation via semantic search
📚 Best Practices - Curated PostgreSQL patterns and recommendations
🔄 Always Up-to-Date - Live knowledge from MCP servers (no outdated training data)
🎯 Intelligent Routing - Automatically decides when to use MCP based on request complexity
🔧 Extensible - Add your own MCP servers via configuration
⚡ Production-Ready - Built-in connection management, retry logic, and health checks

🐘 Built-in: pg-aiguide by Timescale

Tiger SQL comes with pg-aiguide pre-integrated - an AI-optimized PostgreSQL knowledge base created by Timescale. This MCP server provides:

Tool	Description
`pg_view_skill`	Get curated PostgreSQL best practices on specific topics
`pg_list_skills`	Browse all available PostgreSQL knowledge topics
`pg_semantic_search_postgres_docs`	Semantic search across official PostgreSQL documentation

No setup required! pg-aiguide works out of the box. The AI assistant automatically uses it when you ask about PostgreSQL best practices, optimization, or schema design patterns.

User Controls: Users can control MCP behavior with special commands:

[use-mcp] - Force MCP usage for this request
[skip-mcp] - Skip MCP, use direct execution
[mcp-verbose] - Show detailed MCP queries
[use-server:server-id] - Use specific MCP server only
[exclude-server:server-id] - Exclude specific server

Learn more about MCP: Vercel AI SDK MCP Documentation

✨ Features

🎨 Visual Schema Designer

🖱️ Drag & Drop Interface - Create and connect tables effortlessly
🔄 Undo/Redo Support - Full history management with keyboard shortcuts (Cmd/Ctrl+Z)
🎯 Smart Auto-Layout - Automatic table arrangement using Dagre algorithm
🌈 Random Table Colors - Beautiful, randomized color schemes for tables
📸 Export to Image - Save your schema as PNG
🔍 Zoom & Pan - Smooth navigation with minimap support

🤖 AI-Powered Assistant (Enhanced with MCP)

💬 Interactive Chat - AI assistant to help with schema design
🧠 Smart Suggestions - Get recommendations powered by PostgreSQL best practices via MCP
📝 Context-Aware - Understands your current schema state and uses up-to-date PostgreSQL knowledge
🚀 Powered by Multiple LLMs - Support for OpenAI and Google AI
🔌 MCP Integration - Access to real-time PostgreSQL documentation and expertise
📚 Best Practices - Automatic guidance from curated PostgreSQL patterns

🔐 Connection Modes

Create relationships between tables by dragging from one column to another. Choose between two validation modes:

🔓 Flexible Mode (Unlock Icon)

Connect any column to any column without type restrictions
Perfect for quick prototyping and sketching
Ideal for custom types or extensions
Maximum flexibility in schema design

🔐 Strict Mode (Lock Icon)

Only allows connections between type-compatible columns
Validates PostgreSQL data type compatibility
Prevents invalid relationships
Production-ready schema design

Type Compatibility Groups

Category	Compatible Types
UUID	`uuid`
Integer	`integer`, `int`, `int2`, `int4`, `int8`, `smallint`, `bigint`, `serial`, `smallserial`, `bigserial`
Numeric	`numeric`, `decimal`
Float	`real`, `float4`, `double precision`, `float8`
String	`text`, `varchar`, `char`, `character`, `character varying`
Boolean	`boolean`, `bool`
Date	`date`
Time	`time`, `timetz`
Timestamp	`timestamp`, `timestamptz`
JSON	`json`, `jsonb`
Binary	`bytea`

💾 Data Management

📦 Import SQL - Load existing schemas from SQL files
💿 Export SQL - Generate SQL DDL for your schema
🔄 LocalStorage Persistence - Your work is automatically saved
🚪 No Login Required - Start designing immediately

🛡️ Security & Privacy

🔒 Client-Side Only - All processing happens in your browser
👀 No Sensitive Data - Only uses public API keys
🔐 No Database Passwords - Secure by design
🚫 No Server Storage - Your data stays on your device

🎮 User Experience

⚡ Lightning Fast - Built with modern React and Next.js
🎨 Beautiful UI - Powered by Tailwind CSS and shadcn/ui
📱 Responsive Design - Works on all screen sizes
⌨️ Keyboard Shortcuts - Power-user friendly
🌙 Dark Mode Support - Easy on the eyes

🚀 Getting Started

Online (Recommended)

Simply visit Tiger SQL and start designing your schema immediately!

With Supabase

Go to Supabase Dashboard
Select your Project
Navigate to Settings → API
Copy your URL and anon/public key
Paste them into Tiger SQL
Click "Fetch Schema"
Start visualizing! 🎉

Import Existing Schema

Click "Import SQL" button
Paste your SQL DDL or drag & drop a .sql file
Watch your schema come to life!

🛠️ Built With

Tiger SQL is built with modern, cutting-edge technologies:

Next.js 15 - React framework for production
React 19 - Latest React with concurrent features
TypeScript - Type safety and better DX
Tailwind CSS - Utility-first CSS framework
shadcn/ui - Beautiful, accessible components
XYFlow/React Flow - Powerful flow diagram library
Zustand - Lightweight state management
AI SDK - AI integration by Vercel
Zod - TypeScript-first schema validation

💻 Local Development

Prerequisites

Bun runtime (v1.0+)

Installation

Clone the repository

git clone https://github.com/jacksonkasi1/tiger-sql.git
cd tiger-sql

Install dependencies
```
bun install
```

Set up environment variables (Optional - for AI features)

cp .env.example .env.local

Add your API keys:

OPENAI_API_KEY=your_openai_key_here
GOOGLE_GENERATIVE_AI_API_KEY=your_google_ai_key_here

Configure MCP Servers (Optional - for custom MCP servers)

cp .mcp-config.example.json .mcp-config.json

The built-in pg-aiguide MCP server works out of the box. Add custom servers in .mcp-config.json:

{
  "version": "1.0.0",
  "servers": [
    {
      "id": "my-custom-mcp",
      "name": "My Custom MCP Server",
      "transport": {
        "type": "http",
        "url": "https://mcp.example.com"
      },
      "enabled": true,
      "priority": 50,
      "tags": ["custom"],
      "toolNamespace": "custom_"
    }
  ]
}

Run the development server
```
bun dev
```
Open your browser

Navigate to http://localhost:3000

Available Scripts

bun dev - Start development server
bun run build - Build for production
bun start - Start production server
bun run lint - Run ESLint
bun run typecheck - Run TypeScript type checking
bun run analyze - Analyze bundle size
bun run test:memory - Run memory leak tests

🔌 MCP Architecture

Tiger SQL features a scalable, configuration-driven MCP architecture designed for production use:

Key Features

Multi-Server Support - Connect to multiple MCP servers simultaneously
Configuration-Driven - Add/remove servers via JSON config files
Intelligent Routing - Automatic tool selection based on request complexity
Connection Management - Built-in retry logic, timeouts, and health checks
Tool Namespacing - Avoid conflicts with prefixed tool names (e.g., pg_, custom_)
Lifecycle Hooks - Monitor connections and tool usage
Graceful Degradation - App works even if MCP servers are unavailable

Adding Custom MCP Servers

Via Configuration File (Recommended)

Create .mcp-config.json in the project root:

{
  "version": "1.0.0",
  "servers": [
    {
      "id": "my-mcp",
      "name": "My Custom MCP",
      "transport": {
        "type": "http",
        "url": "https://mcp.example.com"
      },
      "enabled": true,
      "priority": 50,
      "tags": ["custom"],
      "toolNamespace": "custom_"
    }
  ]
}

Via Code (For Built-in Servers)

Edit src/lib/mcp/config.ts and add to BUILTIN_MCP_SERVERS:

{
  id: 'my-builtin-mcp',
  name: 'My Built-in MCP',
  transport: {
    type: 'http',
    url: 'https://mcp.example.com',
  },
  enabled: true,
  priority: 50,
  tags: ['builtin'],
  toolNamespace: 'builtin_',
}

Environment Variables

Override defaults:

MCP_CONFIG_PATH=./custom-mcp-config.json
MCP_DISABLE_BUILTIN=false
MCP_AUTO_CONNECT=true
MCP_TIMEOUT=10000
MCP_RETRY_ATTEMPTS=2

MCP Transport Types

HTTP (Recommended for production) - RESTful API endpoint
SSE - Server-Sent Events for streaming
Stdio - Local servers via stdin/stdout (development only)

Learn More

MCP Architecture Documentation
MCP Usage Guide
MCP Quick Start
Vercel AI SDK MCP Guide
pg-aiguide GitHub - Built-in PostgreSQL knowledge by Timescale

🤝 Contributing

Contributions make the open-source community an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated!

How to Contribute

Fork the Project
Create your Feature Branch
```
git checkout -b feature/AmazingFeature
```

Commit your Changes

git commit -m 'feat: Add some AmazingFeature'

Push to the Branch
```
git push origin feature/AmazingFeature
```
Open a Pull Request

Commit Convention

We follow Conventional Commits:

feat: - New features
fix: - Bug fixes
docs: - Documentation changes
style: - Code style changes (formatting, etc.)
refactor: - Code refactoring
test: - Adding or updating tests
chore: - Maintenance tasks

🗺️ Roadmap

See the open issues for a full list of proposed features and known issues.

📊 Performance

Tiger SQL is optimized for performance with:

⚡ Virtual scrolling for large schemas
🧠 Efficient state management with Zustand
🔄 Optimized re-renders with React 19
💾 Smart caching strategies
📦 Code splitting and lazy loading
🎯 Memory leak prevention (tested with MemLab)

🙏 Acknowledgements

Special thanks to:

Supabase - For the inspiration and type generation approach
React Flow - Excellent flow diagram library
shadcn/ui - Beautiful component library
Vercel - Hosting and deployment
All contributors who have helped improve Tiger SQL

💖 Support the Project

If you find Tiger SQL helpful, consider supporting its development:

Your support helps maintain and improve Tiger SQL for everyone! ⭐

📜 License

Distributed under the MIT License. See LICENSE.txt for more information.

Not associated with Supabase.

📧 Contact

Jackson Kasi - @jacksonkasi0

Project Link: https://github.com/jacksonkasi1/tiger-sql

Made with ❤️ by Jackson Kasi

⭐ Star this repo if you find it useful!

Name		Name	Last commit message	Last commit date
Latest commit History 322 Commits
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.vscode		.vscode
data		data
docs		docs
images		images
memlab-tests		memlab-tests
public		public
scripts		scripts
src		src
.eslintrc.json		.eslintrc.json
.gitignore		.gitignore
.mcp-config.example.json		.mcp-config.example.json
.mcp.json		.mcp.json
.prettierrc		.prettierrc
LICENSE.txt		LICENSE.txt
MCP_QUICKSTART.md		MCP_QUICKSTART.md
README.md		README.md
bun.lock		bun.lock
components.json		components.json
memlab.config.js		memlab.config.js
next.config.ts		next.config.ts
package.json		package.json
postcss.config.js		postcss.config.js
tailwind.config.ts		tailwind.config.ts
tsconfig.json		tsconfig.json
vercel.json		vercel.json

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Tiger SQL

🎯 Overview

🔌 MCP Integration (Model Context Protocol)

🐘 Built-in: pg-aiguide by Timescale

✨ Features

🎨 Visual Schema Designer

🤖 AI-Powered Assistant (Enhanced with MCP)

🔐 Connection Modes

🔓 Flexible Mode (Unlock Icon)

🔐 Strict Mode (Lock Icon)

Type Compatibility Groups

💾 Data Management

🛡️ Security & Privacy

🎮 User Experience

🚀 Getting Started

Online (Recommended)

With Supabase

Import Existing Schema

🛠️ Built With

💻 Local Development

Prerequisites

Installation

Available Scripts

🔌 MCP Architecture

Key Features

Adding Custom MCP Servers

MCP Transport Types

Learn More

🤝 Contributing

How to Contribute

Commit Convention

🗺️ Roadmap

📊 Performance

🙏 Acknowledgements

💖 Support the Project

📜 License

📧 Contact

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