Code + comment cleanup for the entities

ref #39

src/models/entities/Scan.ts

@@ -9,7 +9,8 @@ import { Column, Entity, ManyToOne, PrimaryGeneratedColumn, TableInheritance } f
 import { Runner } from "./Runner";
 
 /**
- * Defines the scan interface.
+ * Defines the Scan entity.
+ * A scan basicly adds a certain distance to a runner's total ran distance.
 */
 @Entity()
 @TableInheritance({ column: { name: "type", type: "varchar" } })
@@ -22,7 +23,8 @@ export abstract class Scan {
   id: number;
 
   /**
-   * The associated runner.
+   * The scan's associated runner.
+   * This is important to link ran distances to runners.
    */
   @IsNotEmpty()
   @ManyToOne(() => Runner, runner => runner.scans, { nullable: false })
@@ -30,15 +32,17 @@ export abstract class Scan {
 
   /**
    * The scan's distance in meters.
+   * Can be set manually or derived from another object.
    */
   @IsInt()
   @IsPositive()
   abstract distance: number;
 
   /**
- * Is the scan valid (for fraud reasons).
- * Default: true
- */
+   * Is the scan valid (for fraud reasons).
+   * The determination of validity will work differently for every child class.
+   * Default: true
+   */
   @Column()
   @IsBoolean()
   valid: boolean = true;