Store additional beatmap data

[myssto]

Currently we do not store the osu! id of the beatmap set for each beatmap, which is relevant for certain use cases such as accessing the beatmap's image assets. In addition to this, the osu! API returns different objects for each beatmap when requesting /beatmaps/{id} and /beatmapsets/{id}. When requesting /beatmapsets/{id}, the API will include the proper user data for all collab members (see below). When a single beatmap is requested from /beatmaps/{id}, the owner will always be set to the user who uploaded the beatmap set. Finally, we should support fetching and storing beatmap attributes (namely SR, as that cannot be calculated with a formula without having the beatmap file) so we can display that information properly on the website.

Tasks

• New Beatmap relationships  #586
• Add support for fetching a beatmap set and beatmap attributes with the OsuApiClient
  • Create / modify the appropriate JSON models and domain models
  • Implement methods on the OsuApiClient class
• Update the DataWorkerService.Services.OsuApiDataParserService to handle parsing the new data structure
• Update beatmap related DTOs following new schema changes #588

osu! API example responses

Pastebin below contains example osu! API responses for each of the possible variations of the data concerned in this proposal
https://pastebin.com/bkC1ytwr

Entity Structures

type BeatmapSet = {
  // PK
  id: number;
  created: Date;
  updated?: Date;
  // Index - unique
  osuId: long;
  artist: string = "";
  title: string = "";
  ranked_status: BeatmapRankedStatus;
  ranked_date?: Date;
  submitted_date?: Date;
  // FK - players { id }
  creatorId: number;
  creator: Player;
  // Relation - 1TM -> beatmaps
  beatmaps: Beatmap[];
}

type BeatmapAttributes = {
  // PK
  id: number;
  created: Date;
  // FK - beatmaps { id }
  beatmap_id: number;
  // Index - unique compound { beatmap_id, mods }
  mods: Mods;
  sr: double;
}

type Beatmap = {
  // PK
  id: number;
  created: Date;
  updated?: Date;
  // Index - unique
  osuId: long;
  ruleset: Ruleset;
  diff_name: string = "";
  // Seconds
  total_length: number;
  // Seconds
  drain_length: number;
  bpm: double;
  count_circle: number;
  count_slider: number;
  count_spinner: number;
  cs: double;
  hp: double;
  od: double;
  ar: double;
  // Should always be the NM star rating
  sr: double;
  // Not always present
  max_combo?: number;
  // Relation - MTM -> players
  creators: Player[];
  // FK - beatmap_sets { id }
  beatmapset_id: number;
  beatmapset: BeatmapSet;
  // Relation - MT1 -> games
  games: Game[];
  // Relation - MTM -> tournaments
  tournaments_pooled_in: Tournament[];
}