feat: major code refactor, add login and register endpoints with swagger

src/entities/User.ts

@@ -1,30 +1,35 @@
-import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from "typeorm"
-import { Link } from "./Link"
+import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from 'typeorm'
+import { Link } from './Link'
 
 @Entity("users")
 export class User {
 
 	// Unique user id.
 	@PrimaryGeneratedColumn()
-	id: number
+	id: number | undefined; // Is this a good idea?
 
 	// User name, must be unique.
 	@Column({ unique: true })
-	name: string
+	name: string;
 
 	// Salted password hash.
 	@Column()
-	passwordHash: string
+	passwordHash: string;
+
+	// Used to tell, whether password hash should
+	// be recalculated (salted) on next login.
+	@Column()
+	dirtyPasswordHashBit: boolean;
 
 	// User role:
 	// - 0 - means unprivileged user,
 	// - 1 - means administrative user.
 	@Column()
-	role: number
+	role: number;
 
 	// Account creation date as a Unix timestamp.
 	@Column('bigint')
-	createdAt: number
+	createdAt: number;
 
 	// List of shortened URLs which belong to the user.
 	@OneToMany(() => Link, (link) => link.author)