music_library/backlog/completed/ml-2 - Verify-or-drop-multipart-hex-dependency.md

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

id	title	status	assignee	created_date	labels	dependencies	references	priority
ML-2	Verify or drop multipart hex dependency	Done		2026-04-20 08:44			https://github.com/cloud8421/music_library/issues/182	low

Description

GitHub: created 2026-04-16 · updated 2026-04-16 · closed 2026-04-16

Summary

mix.exs lists {:multipart, "~> 0.6.0"} but there are zero direct Multipart.* references in lib/. It is likely needed transitively for Swoosh Mailgun attachments, but worth confirming.

Evidence

• mix.exs — {:multipart, "~> 0.6.0"} declared as a direct dep
• Grep for Multipart. in lib/ returns no matches
• Endpoint's parsers: [:multipart] is the Plug.Parsers atom, not this hex package

Fix (decision tree)

1. Remove the dep from mix.exs
2. Run mix deps.get + mix compile
3. Run mix test and specifically the Mailer-sending paths (RecordsOnThisDayEmail, ErrorTracker.ErrorNotifier.Email)
4. If something fails, restore the dep and add a comment in mix.exs noting what relies on it
5. If everything passes, keep it removed

Acceptance Criteria

• #1 Decision recorded: either dep removed, or dep retained with comment explaining transitive need