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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Earthquake Alert System
# Description: A production-ready FastAPI application with Pydantic v2 for building Micro-SaaS earthquake alert systems.
# Author: [Your Name]

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List
import requests
import json

app = FastAPI()

# Define the Earthquake model using Pydantic
class Earthquake(BaseModel):
    """Earthquake model"""
    id: int
    magnitude: float
    location: str
    depth: float
    timestamp: str

# Define the Alert model using Pydantic
class Alert(BaseModel):
    """Alert model"""
    id: int
    earthquake_id: int
    message: str
    sent: bool

# In-memory data store for earthquakes and alerts
earthquakes: List[Earthquake] = []
alerts: List[Alert] = []

# Endpoint to retrieve all earthquakes
@app.get("/earthquakes", response_model=List[Earthquake])
async def get_earthquakes():
    """Retrieve all earthquakes"""
    return earthquakes

# Endpoint to retrieve an earthquake by ID
@app.get

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