music_library/backlog/tasks/ml-144 - Implement-magazine-issue-ingestion-pipeline.md

id, title, status, assignee, created_date, labels, dependencies, priority

id	title	status	assignee	created_date	labels	dependencies	priority
ML-144	Implement magazine issue ingestion pipeline	To Do		2026-04-22 15:38	feature magazines ai oban pipeline		medium

Description

Build a pipeline to ingest music magazine issues (PDF), extract structured metadata (artist mentions, album reviews, upcoming releases, features), and surface relevant information in the app.

Approach (Approved)

Approach 1 — Text-first, single LLM pass with structured output:

• Extract text locally with pdftotext (poppler, shell from Elixir)
• Feed chunks to OpenAI Responses API with JSON schema for structured output
• One Oban worker per issue, one API call per chunk
• Cost estimate: ~$0.01–0.10 per issue with gpt-4o-mini

Pipeline Overview

1. Upload PDF → store as Asset
2. Enqueue IngestIssue worker (new magazines queue, concurrency 1)
3. Extract text locally (pdftotext)
4. Split by section boundaries (page breaks, headings)
5. Per-chunk LLM call requesting structured payload:
   • mentions: [{type: "artist"|"album"|"track", name, artist_name?, release_date?, context_snippet}]
   • topic: "review"|"news"|"upcoming"|"feature"
6. Persist to new Magazines context (Issue, Mention schemas)
7. Resolve each mention against existing records/artists by name (MusicBrainz lookup fallback for unknowns)

Personalization Layer

• Load collection's artist MBIDs once per issue
• Match mentions by name → MBID (exact match, then fuzzy / MusicBrainz search)
• For matched artists/albums: create Note linked via musicbrainz_id with article snippet
• For unmatched artists in recommendation contexts: queue as wishlist candidates
• Upcoming releases: new schema or flag on notes with reminder job

Integration Points

• New context: MusicLibrary.Magazines with Issue and Mention schemas
• New Oban queue: magazines (concurrency 1)
• Workers: IngestIssue, ExtractArticle, ResolveMentions
• LiveView: MagazineLive.Index/Show under main authenticated live_session
• Surface mentions on CollectionLive.Show, ArtistLive.Show ("mentioned in Prog #166, Dec 2025")

Acceptance Criteria

• #1 Pipeline can ingest a magazine PDF and extract text without OCR
• #2 Structured extraction (artist/album mentions, topics) is persisted to database
• #3 Mentions are resolved against existing collection with MusicBrainz fallback lookup
• #4 Notes are created for matched artists/albums with article context
• #5 Magazine mentions surface on record/artist detail pages
• #6 Cost per issue documented and under budget estimate