Switched from implementing the "interfaces" as interface to abstract classes

ref #11
This was done to take advantage of typeorm and class validator

src/models/IScan.ts

@@ -1,19 +1,35 @@
+import { Entity, PrimaryGeneratedColumn, Column } from "typeorm";
+import {
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsPositive,
+} from "class-validator";
+
 /**
  * Defines the scan interface.
 */
-export interface IScan {
+export abstract class IScan {
   /**
    * Autogenerated unique id (primary key).
    */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
   id: number;
 
   /**
    * The associated runner.
    */
+  @Column()
+  @IsNotEmpty()
   runner: Runner;
 
   /**
    * The scan's distance in meters.
    */
+  @Column()
+  @IsInt()
+  @IsPositive()
   distance: number;
 }