Basic SQL schema, database config

.gitignore

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+.vscode/

config.php

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+<?php
+
+# MariaDB/MySQL database settings
+
+return array(
+    "db_host" => "localhost",
+    "db_port" => 3306,
+    "db_name" => "mydatabase",
+    "db_user" => "myusername",
+    "db_pass" => "myverysecretpassword"
+);

schema.sql

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+CREATE TABLE IF NOT EXISTS settings (
+    setting_key VARCHAR(255) NOT NULL,
+    setting_value VARCHAR(255),
+    PRIMARY KEY (setting_key)
+);
+
+CREATE TABLE IF NOT EXISTS users (
+    user_id INT NOT NULL AUTO_INCREMENT,
+    display_name VARCHAR(255),
+    email VARCHAR(255) NOT NULL UNIQUE,
+    password VARCHAR(255) NOT NULL,
+    salt VARCHAR(255) NOT NULL,
+    is_admin BOOLEAN,
+    PRIMARY KEY (user_id)
+);
+
+CREATE TABLE IF NOT EXISTS user_sessions (
+    session_id VARCHAR(255) NOT NULL,
+    salt VARCHAR(255) NOT NULL,
+    user_id INT NOT NULL,
+    expiry DATETIME NOT NULL,
+    PRIMARY KEY (session_id),
+    FOREIGN KEY (user_id) REFERENCES users(user_id)
+);
+
+CREATE TABLE IF NOT EXISTS locations (
+    location_id INT NOT NULL AUTO_INCREMENT,
+    name VARCHAR(255) NOT NULL,
+    logo BLOB,
+    PRIMARY KEY (location_id)
+);
+
+CREATE TABLE IF NOT EXISTS permissions (
+    user_id INT NOT NULL,
+    location_id INT NOT NULL,
+    is_owner BOOLEAN,
+    PRIMARY KEY (user_id, location_id),
+    FOREIGN KEY (user_id) REFERENCES users(user_id),
+    FOREIGN KEY (location_id) REFERENCES locations(location_id)
+);
+
+CREATE TABLE IF NOT EXISTS visits (
+    visit_id INT NOT NULL AUTO_INCREMENT,
+    location_id INT NOT NULL,
+    arrival DATETIME NOT NULL,
+    departure DATETIME NOT NULL,
+    PRIMARY KEY (visit_id),
+    FOREIGN KEY (location_id) REFERENCES locations(location_id)
+);
+
+CREATE TABLE IF NOT EXISTS visitors (
+    visitor_id INT NOT NULL AUTO_INCREMENT,
+    visit_id INT NOT NULL,
+    first_name VARCHAR(255) NOT NULL,
+    last_name VARCHAR(255) NOT NULL,
+    address1 VARCHAR(255),
+    address2 VARCHAR(255),
+    zip VARCHAR(255),
+    city VARCHAR(255),
+    country VARCHAR(255),
+    phone VARCHAR(255),
+    email VARCHAR(255),
+    PRIMARY KEY (visitor_id),
+    FOREIGN KEY (visit_id) REFERENCES visits(visit_id)
+);