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```rust
// AI Dev Tool: Rust PostgreSQL Vector Search Extension
// ================================================
// A production-ready PostgreSQL vector search extension using Rust.

// Dependencies
// ------------
// * postgres: PostgreSQL driver for Rust
// * serde: Serialization and deserialization framework for Rust
// * serde_json: JSON serialization and deserialization for Rust

use postgres::{Client, NoTls, Row};
use serde::{Deserialize, Serialize};
use serde_json::json;

// PostgreSQL Vector Search Extension
// -----------------------------------
// A PostgreSQL extension for vector search using Rust.

#[derive(Debug, Serialize, Deserialize)]
struct VectorSearchConfig {
    /// Hostname or IP address of the PostgreSQL server
    host: String,
    /// Port number of the PostgreSQL server
    port: u16,
    /// Username for authentication
    username: String,
    /// Password for authentication
    password: String,
    /// Database name
    database: String,
}

impl VectorSearchConfig {
    /// Create a new instance of VectorSearchConfig
    fn new(
        host: String,
        port: u16,
        username: String,
        password: String,
        database: String,
    ) -> Self {
        VectorSearchConfig {
            host,
            port,
            username,
            password

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