add sql model and php basice

.gitignore

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+.vscode

resources/config.php

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+<?php
+
+    /**
+     * PHP version 8.1.11
+     */
+
+    ini_set('display_errors', 1);
+    ini_set('display_startup_errors', 1);
+    error_reporting(E_ALL);
+
+    // Basice parameters to connect to the database
+    const DB_SERVER = '127.0.0.1';
+    const DB_PORT = '5432';
+    const DB_NAME = 'fermentardoise';
+    const DB_USER = 'postgres';
+    const DB_PASSWORD = '';
+
+    // Some constants to use in the application
+    const ACCESS_TOKEN_NAME = 'fermentardoise_session';
+
+    /*
+        Creating constants for heavily used paths makes things a lot easier.
+        ex. require_once(LIBRARY_PATH . "exceptions.php")
+    */
+    defined("LIBRARY_PATH")
+        or define("LIBRARY_PATH", realpath(dirname(__FILE__) . '/library'));
+
+?>

resources/library/exceptions.php

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+<?php
+
+    /**
+     * This exception is thrown when the authentication failed.
+     */
+    class AuthenticationException extends Exception {}
+    
+?>

resources/library/redirect.php

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+<?php
+    /**
+     * Redirects to a new page
+     * 
+     * @param string $page The requested page.
+     */
+    function redirect(string $page): void{
+        $host = $_SERVER['HTTP_HOST'];
+        $uri = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
+        header("Location: //$host$uri/$page");
+        exit;
+    }
+?>

sql/model.sql

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+/************************************************************************
+Creation Date:  2022-11-19
+Description:    Creates the database tables and relations.
+Usage:          psql -U postgres -d fermentardoise -a -f model.sql
+                https://stackoverflow.com/a/23992045/12619942
+************************************************************************/
+
+DROP TABLE IF EXISTS users CASCADE;
+DROP TABLE IF EXISTS clients CASCADE;
+DROP TABLE IF EXISTS payments CASCADE;
+
+-- Table users
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    login VARCHAR(255) NOT NULL,
+    password_hash VARCHAR(50) NOT NULL
+);
+
+-- Table clients
+CREATE TABLE clients (
+    id SERIAL PRIMARY KEY,
+    lastname VARCHAR(64) NOT NULL,
+    firstname VARCHAR(64) NOT NULL
+);
+
+-- Table payments
+CREATE TABLE payments (
+    id SERIAL PRIMARY KEY,
+    amount FLOAT NOT NULL,
+    comment TEXT,
+    date_time TIMESTAMP NOT NULL,
+    client_id INTEGER NOT NULL,
+    user_id INTEGER NOT NULL,
+
+    FOREIGN KEY (client_id) REFERENCES clients(id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE,
+    FOREIGN KEY (user_id) REFERENCES users(id)
+        ON UPDATE CASCADE
+        ON DELETE CASCADE
+);