Updated backend

- Added better anti DoS protection
- Added better security measures (HTTP headers, etc.)
- Added TLS support
- Added support for configurable rate limiting
- Added default 404 and error handling
- Updated proxy settings
- Updated env naming

database.sql

@@ -67,7 +67,7 @@ CREATE TABLE user_roles (
 CREATE TABLE verification_codes (
   id INT UNSIGNED NOT NULL AUTO_INCREMENT,
   user_id INT UNSIGNED NOT NULL,
-  verification_code VARCHAR(255),
+  verification_code VARCHAR(255) NOT NULL,
   type VARCHAR(32) NOT NULL,
   created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
   PRIMARY KEY (id),