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```rust
// AI Dev Tool: NanoGPT Speedrun Frontier - FastAPI Pydantic v2 Micro-SaaS Starter
// Production Starter Boilerplate for building high-performance micro-SaaS applications

// Import required dependencies
use fastapi::FastAPI;
use fastapi::requests::Request;
use fastapi::responses::JSONResponse;
use pydantic::BaseModel;
use pydantic::Field;
use sqlx::PgPool;
use sqlx::postgres::PgPoolOptions;
use std::env;

// Define a Pydantic model for user input validation
#[derive(BaseModel)]
struct UserInput {
    #[Field(description = "User's name")]
    name: String,
    #[Field(description = "User's email")]
    email: String,
}

// Define a FastAPI application
#[fastapi]
async fn main() -> FastAPI {
    // Initialize the FastAPI application
    let app = FastAPI::new();

// Define a route for handling user input
    app.route(
        "/submit",
        fastapi::Method::POST,
        |req: Request| async move {
            // Validate user input using Pydantic
            let input: UserInput = req.json().await?;

// Connect to

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