add core api

src/database/entities/country.entity.ts

@@ -1,22 +1,10 @@
-import { City } from "@/database/entities/city.entity";
-import {
-	Collection,
-	Entity,
-	OneToMany,
-	PrimaryKey,
-	Property,
-	Unique,
-} from "@mikro-orm/core";
+import { Entity, PrimaryKey, Property } from "@mikro-orm/core";
 
 @Entity()
 export class Country {
 	@PrimaryKey({ type: "varchar", length: 30 })
 	id!: string;
 
-	@Property({ type: "varchar", length: 200 })
-	@Unique()
-	slug!: string;
-
 	@Property({ type: "varchar", length: 100 })
 	name!: string;
 
@@ -32,9 +20,4 @@ export class Country {
 		onUpdate: () => new Date(),
 	})
 	updatedAt!: Date;
-
-	// Collections
-
-	@OneToMany(() => City, (city) => city.country)
-	cities = new Collection<City>(this);
 }