Adding Seat plan component and database tables

software/backend/models/locations/city.model.ts

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+import { Column, HasMany, Model, Table } from "sequelize-typescript";
+import { Location } from "./location.model";
+
+@Table({ timestamps: false })
+export class City extends Model {
+  @Column
+  name: String
+
+  @Column
+  country: String
+
+
+  // Relations
+
+  @HasMany(() => Location)
+  locations: Location[]
+}

software/backend/models/locations/location.model.ts

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+import { BelongsTo, Column, ForeignKey, HasMany, Model, Table } from "sequelize-typescript";
+import { Concert } from "./../acts/concert.model";
+import { City } from "./city.model";
+import { SeatGroup } from "./seatGroup.model";
+
+@Table({ timestamps: false })
+export class Location extends Model {
+  @Column
+  name: String
+
+  @Column
+  address: String
+
+  @ForeignKey(() => City)
+  @Column
+  cityId: Number
+
+  @Column
+  image: String
+
+
+  // Relations
+
+  @HasMany(() => Concert)
+  concerts: Concert[]
+
+  @HasMany(() => SeatGroup)
+  seatGroups: SeatGroup[]
+
+  @BelongsTo(() => City)
+  city: City
+}

software/backend/models/locations/seat.model.ts

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+import { BelongsTo, Column, ForeignKey, Model, Table } from "sequelize-typescript";
+import { SeatRow } from "./seatRow.model";
+
+@Table({ timestamps: false })
+export class Seat extends Model {
+  @Column
+  seatNr: number
+
+  @ForeignKey(() => SeatRow)
+  @Column
+  seatRowId: Number
+
+
+  // Relations
+
+  @BelongsTo(() => SeatRow)
+  seatRow: SeatRow
+}

software/backend/models/locations/seatGroup.model.ts

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+import { BelongsTo, Column, Default, ForeignKey, HasMany, Model, Table } from "sequelize-typescript";
+import { Location } from "./location.model";
+import { SeatRow } from "./seatRow.model";
+
+@Table({ timestamps: false })
+export class SeatGroup extends Model {
+  @Column
+  name: String
+
+  @Column
+  surcharge: Number
+
+  @Column
+  capacity: Number
+
+  @Default(false)
+  @Column
+  standingArea: Boolean
+
+  @ForeignKey(() => Location)
+  @Column
+  locationId: Number
+
+
+  // Relations
+
+  @BelongsTo(() => Location)
+  location: Location
+
+  @HasMany(() => SeatRow)
+  seatRows: SeatRow[]
+}

software/backend/models/locations/seatRow.model.ts

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+import { BelongsTo, Column, ForeignKey, HasMany, Model, Table } from "sequelize-typescript";
+import { SeatGroup } from "./seatGroup.model";
+import { Seat } from "./seat.model";
+
+@Table({ timestamps: false })
+export class SeatRow extends Model {
+  @Column
+  row: number
+
+  @ForeignKey(() => SeatGroup)
+  @Column
+  seatGroupId: number
+
+  
+  // Relations
+
+  @BelongsTo(() => SeatGroup)
+  seatGroup: SeatGroup
+
+  @HasMany(() => Seat)
+  seats: Seat[]
+}