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```python
# AI Dev Tool: QuantumMessenger SaaS
# Post-Quantum Secure E2EE Messenger Core using Qt and Rust
# FastAPI Pydantic v2 Micro-SaaS with Local Indexing

from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Optional
import logging
from logging.config import dictConfig
import sqlite3
from sqlite3 import Error

# Configure logging
dictConfig({
    'version': 1,
    'formatters': {
        'default': {
            'format': '[%(asctime)s] %(levelname)s in %(module)s: %(message)s',
        }
    },
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
            'stream': 'ext://sys.stdout',
            'formatter': 'default'
        }
    },
    'root': {
        'level': 'DEBUG',
        'handlers': ['console']
    }
})

# Initialize the FastAPI app
app = FastAPI()

# Define the message model
class Message(BaseModel):
    id: int
    text: str
    sender: str
    receiver: str

# Define the database

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