┌─────────────────────────┐       JSON-RPC 2.0        ┌─────────────────────────┐
│  LangGraph Multi-Agent  │ <======================>  │   mcp-postgres-wal-     │
│  StateGraph Supervisor  │      (Tool Request)       │   server (MCP Daemon)   │
└─────────────────────────┘                           └─────────────────────────┘
             │                                                     │
             │ State Failure /                                     ▼
             │ Saga Compensation                      ┌─────────────────────────┐
             └──────────────────────────────────────> │  Neon / PostgreSQL      │
                                                      │  ACID Checkpoint Tables │
                                                      └─────────────────────────┘

git clone https://github.com/botmartz/mcp-postgres-wal-server.git
cd mcp-postgres-wal-server
pip install -e .

{
  "mcpServers": {
    "postgres-wal": {
      "command": "python3",
      "args": ["-m", "mcp_postgres_wal.server"],
      "env": {
        "DATABASE_URL": "postgresql://user:password@ep-forest-1234.us-east-2.aws.neon.tech/neondb?sslmode=require"
      }
    }
  }
}