Moved to a "cleaner" directory structure

ref #11

src/models/entities/Track.ts

@@ -0,0 +1,52 @@
+import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from "typeorm";
+import {
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsPositive,
+  IsString,
+} from "class-validator";
+import { ScanStation } from "./ScanStation";
+import { TrackScan } from "./TrackScan";
+
+/**
+ * Defines a track of given length.
+*/
+@Entity()
+export class Track {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;;
+
+  /**
+   * The track's name.
+   */
+  @Column()
+  @IsString()
+  @IsNotEmpty()
+  name: string;
+
+  /**
+   * The track's length/distance in meters.
+   */
+  @Column()
+  @IsInt()
+  @IsPositive()
+  distance: number;
+
+  /**
+   * Used to link scan stations to track.
+   */
+  @OneToMany(() => ScanStation, station => station.track, { nullable: true })
+  stations: ScanStation[];
+
+  /**
+   * Used to link track scans to a track.
+   */
+  @OneToMany(() => TrackScan, scan => scan.track, { nullable: true })
+  scans: TrackScan[];
+}