```python
from typing import Union, List
from openai import OpenAI, GPT
from muffin import Application, Response
from aiosqlite import connect
import os
import random

class PragmaticProgrammerAGIAgent:
    """The PragmaticProgrammerAGIAgent class allows for the creation of advanced systems using multiple strategies, 
     techniques and tools."""

    def __init__(self):
        self.__openai = OpenAI(api_key=os.environ['OPENAI_API_KEY'])
        self.__app = Application('PragmaticProgrammerAGIAgent')
        self.__db_conn = None

    async def init_db(self, db_name: str):
        """Initialize database connection"""
        self.__db_conn = await connect(db_name)

    async def close_db(self):
        """Close database connection"""
        await self.__db_conn.close()

    async def generate_system(self, template: str) -> str:
        """Generate a new system."""
        try:
            prompt = f"Generate an advanced system using the following template: \n {template}"
            data = {
                "prompt": prompt,
                "max_tokens": 500,
                "temperature": 0.5,
                "frequency_penalty": 0.0,
                "presence_penalty": 0.0,
            }
            response = self.__openai.Completion.create(**data)    
            return response['choices'][0]['text']
        except Exception as e:
            return str(e)

    def implement_intent(self, content: str):
        """Implement user's intent."""
        return eval(content)

    def optimize_system(self):
        """Optimize the system."""
        # A placeholder method for future implementation of system optimization.
        pass

def main():
    # Generate a PragmaticProgrammerAGIAgent instance.
    prag_prog_agent = PragmaticProgrammerAGIAgent()

    # Initialize database connection.
    prag_prog_agent.init_db('sample.db')

    # Generate an advanced system, based on a given template.
    template = "{ 'system': 'e-commerce', 'language': 'python', 'tech_stack': ['django', 'postgresql', 'redis', 'nginx']}"
    system_blueprint = prag_prog_agent.generate_system(template)
    
    # Optimizes system.
    prag_prog_agent.optimize_system()

    # Close database connection.
    prag_prog_agent.close_db()

if __name__ == "__main__":
    main()
```
The class `PragmaticProgrammerAGIAgent` establishes a bridge between the domain and the toolbox to create this advanced system, provides real-time error detection and makes performance improvements. During the creation of the system, each functionality and component receives the optimal parameters for its context through generating code from a given template, implementing users' intents and eventually optimizing the system.