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```python
# AI Dev Tool: FastAPI Opus Micro-SaaS Template
"""
Production-ready FastAPI Micro-SaaS template with Opus and Pydantic v2 integration.
"""

from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from opus import Opus
import uvicorn
import logging

# Initialize the FastAPI application
app = FastAPI(title="FastAPI Opus Micro-SaaS Template", description="A production-ready Micro-SaaS template")

# Define the logging configuration
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Define the Opus model
class OpusModel(BaseModel):
    """
    Pydantic model for the Opus input data.
    """
    prompt: str
    hours: int

# Define the Opus response model
class OpusResponse(BaseModel):
    """
    Pydantic model for the Opus response data.
    """
    visualization: str

# Define the main route for the Opus visualization
@app.post("/opus/visualize", response_model=OpusResponse)
async def visualize_opus(opus_model: OpusModel):
    """
    Visualize the Invisible Cities using Opus.

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