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```rust
// AI Dev Tool: Vector Search API
// =================================
// A production-ready API integration wrapper for PostgreSQL Vector Search Extension
// using Rust and the actix-web framework.

// Dependencies
// ------------
use actix_web::{web, App, HttpResponse, HttpServer, Responder};
use serde::{Deserialize, Serialize};
use sqlx::PgPool;

// Configuration
// -------------
#[derive(Deserialize, Serialize)]
struct Config {
    database_url: String,
}

// Vector Search API
// ------------------
#[derive(Deserialize, Serialize)]
struct VectorSearchQuery {
    vector: Vec<f64>,
    limit: i64,
}

#[derive(Deserialize, Serialize)]
struct VectorSearchResult {
    id: i64,
    vector: Vec<f64>,
    distance: f64,
}

// PostgreSQL Vector Search Extension
// -----------------------------------
async fn vector_search(
    pool: web::Data<PgPool>,
    query: web::Json<VectorSearchQuery>,
) -> impl Responder {
    let query = query.into_inner();
    let vector = query.vector;
    let limit = query.limit;

// Create a PostgreSQL connection pool
    let conn = pool.get().await.unwrap();

// Create a table with a vector column
    sql

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