SkinbaseNova/docs/Discover/for-you.md

For You

Route

• URL: GET /discover/for-you
• Auth required: yes
• Controller: App\Http\Controllers\Web\DiscoverController::forYou()
• Entry service: App\Services\Recommendations\RecommendationFeedResolver

High-level flow

For You is not a simple search sort. It is a recommendation pipeline with engine selection, caching, layered candidate generation, reranking, and cursor pagination.

The controller:

1. reads limit and cursor
2. calls RecommendationFeedResolver::getFeed()
3. converts feed items into the artwork card view model
4. returns HTML or JSON depending on request type

Engine selection

RecommendationFeedResolver chooses between two implementations:

• V2: App\Services\Recommendations\RecommendationServiceV2
• V1: App\Services\Recommendations\PersonalizedFeedService

Selection is based on:

• config('discovery.v2.enabled')
• rollout percentage bucket for the current user
• explicit algo_version override

Cache model

Both engines use user_recommendation_cache.

At request time:

1. Load cache row for (user_id, algo_version)
2. Check cache version and expires_at
3. If missing or stale, dispatch RegenerateUserRecommendationCacheJob
4. If the row is empty, build fallback recommendations inline for the current request

This means the page is usually cache-backed, but it does not hard-fail if the cache is cold.

V2 pipeline

V2 is the richer layered engine.

Candidate layers

The candidate pool is blended from:

• personalized layer
• social layer
• trending layer
• exploration layer
• vector layer (only when V3/vector support is enabled and configured)

Default target ratios from config/discovery.php:

• personalized: 50%
• social: 20%
• trending: 20%
• exploration: 10%

Main V2 score

For each candidate row:

score
  = (base_score * weight_base)
  + session_boost
  + social_boost
  + trending_boost
  + exploration_boost
  + creator_boost
  + vector_boost
  - negative_penalty
  - repetition_penalty

Where:

• session_boost comes from merged session/profile signals
• social_boost comes from followed creators and artworks liked by followed creators
• trending_boost is built from trending_score_1h, trending_score_24h, trending_score_7d
• exploration_boost rewards fresh uploads, new creators, and unseen tags
• creator_boost uses creator follower count plus artwork momentum metrics
• vector_boost comes from visual similarity when vector mode is enabled
• negative_penalty reflects hidden artworks and disliked tags
• repetition_penalty suppresses creator and tag repetition inside one result page

Trending contribution inside V2

V2 combines the artwork's stored trending columns like this:

trendingBoost
  = (trending_score_1h * weight_1h)
  + (trending_score_24h * weight_24h)
  + (trending_score_7d * weight_7d)

Then divides by 100 before merging into the final score.

Negative signals

V2 reads user_negative_signals and applies:

• hidden artwork exclusion
• disliked tag penalty

Supporting data sources

V2 reads from:

• user_recommendation_cache
• session/profile signal builders
• artworks
• artwork_stats
• artwork_similarities
• artwork_embeddings and vector service, when enabled
• user_followers
• artwork_favourites
• user_negative_signals

V1 pipeline

V1 is simpler and category-affinity driven.

It reads user_interest_profiles, then scores candidates with a weighted blend:

score = (w1 * affinity)
      + (w2 * recency)
      + (w3 * popularity)
      + (w4 * novelty)

Cold start falls back to a blend of popular artworks and artwork_similarities seeds.

Background jobs and schedules

Directly relevant

• RegenerateUserRecommendationCacheJob
  • dispatched on demand when cache is missing or stale

Support jobs for candidate quality

• RecBuildItemPairsFromFavouritesJob every 4 hours
• RecComputeSimilarByTagsJob daily at 02:00
• RecComputeSimilarByBehaviorJob daily at 02:15
• RecComputeSimilarHybridJob daily at 02:30
• analytics:aggregate-discovery-feedback daily at 03:25

These jobs do not directly render the page, but they improve the offline inputs and behavioral data used by the recommender.

Cache behavior

• V1 cache TTL default: 60 minutes
• V2 cache TTL default: 15 minutes

Cursor pagination is offset-based under the hood.

Notes

• For You is the most configuration-sensitive page in this set.
• What a given user sees can differ by rollout bucket, algo_version, cache state, and whether V2/V3 features are enabled.
• If you are debugging a single user's page, inspect RecommendationFeedResolver::inspectDecision() first.