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

src/entities/Link.ts

@@ -1,48 +1,49 @@
-import { Entity, PrimaryGeneratedColumn, Column, ManyToOne, JoinTable } from "typeorm"
-import { User } from "./User"
+import { Entity, PrimaryGeneratedColumn, Column, ManyToOne, JoinTable } from 'typeorm'
+import { User } from './User'
 
 @Entity("links")
 export class Link {
 
 	// Unique link id.
 	@PrimaryGeneratedColumn()
-	id: number
+	id: number;
 
 	// Experimental: subdomain which should be a part of the short url.
 	// For instance in the URL "abc.example.com/def", abc is the subdomain.
 	// "def.example.com/def" won't resolve to the URL that "abc.example.com/def" does.
-	@Column({ nullable: true })
-	subdomain: string | null
+	// https://stackoverflow.com/a/67535817
+	@Column({ type: 'varchar', nullable: true })
+	subdomain: string | null;
 
 	// Shortened Uri.
 	@Column()
-	shortUri: string
+	shortUri: string;
 
 	// URL to which the user should be redirected
 	@Column()
-	fullUrl: string
+	fullUrl: string;
 
 	// Unix timestamp of link creation date.
 	@Column('bigint')
-	createDate: number
+	createDate: number;
 
 	// Unix timestamp of when the link should expire.
 	// If null, the link will never expire unless deleted.
 	@Column('bigint', { nullable: true })
-	expiryDate: number | null
+	expiryDate: number | null;
 
 	// Aggregated amount of visits.
 	@Column('bigint')
-	visits: number
+	visits: number;
 
 	// Link privacy:
 	// - true, if link is private
 	// - false, if link can be shown in a list of recent links publicly.
 	@Column()
-	privacy: boolean
+	privacy: boolean;
 
 	// User to which the shortened URL belongs.
 	@ManyToOne(() => User, (user) => user.links, { nullable: true })
 	@JoinTable()
-	author: User | null
+	author: User | null;
 }