[Squeaks72]

Summary

• A series is scanned from its files, so it carries only what its main source gave when they were written. A series whose main source never described it, or whose follower source has a description, genres, author or cover the main one lacks, kept the gap for good. bff/src/lib/metaFill.ts (fillMissingMeta) now fills it from the sources the series is attached to: its own source first, then its followers in the order they were added, skipping switched-off or failing sources, until nothing is missing.
• Only empty fields are filled; nothing a scan, a source or a person set is replaced. Text (description, genres, author) goes to series_overrides, the one place a scan does not overwrite, and only where the field is still empty at write time. A cover goes to series_art.cover (the automatic cover, below any cover a person chose) and only for a series with no chapters yet, since otherwise the series already has its first page.
• Two callers: the nightly library repair (a new stepMeta after the reading-directions step: 15 series a night, picked by seriesMissingMeta, stopping between series for a Cancel or a shutdown), and the manual follow route (POST /api/admin/series/:id/sources), which fires it in the background after the follow is stored. It never throws and never delays the answer.
• No new route or setting, so no openapi change.

Type

• Feature

Testing

bff and web typecheck clean; web npm test passes in full. New bff/test/metaFill.int.test.ts against a throwaway Postgres: a series missing everything is filled from its follower (trimmed, main source asked first), a second call asks nothing, a complete series gets no override row, a partly filled one gets only its empty fields (a person's genres and a scanned description are left alone), a failing source is skipped for the next, an unknown series is a no-op, seriesMissingMeta picks only series that still lack something, plus source checks that the repair step and the follow route call it. repair.int (53) and seriesSources.int (16) pass unchanged. Nothing was exercised against a real source or in a browser.

Checklist

• Focused scope (one topic)
• Matches the existing TypeScript style
• Docs updated if user-facing (docs/USAGE.md)
• No new default sources hardcoded to specific sites

🤖 Generated with Claude Code

[AngeloSha]

Thank you, this is a good idea, and it's in v0.73.0 as
Admin → Settings → Library housekeeping → Fill in missing details. I rebuilt it on the same pattern as the
chapter-name borrowing (#85), so a few things work differently from your version:

• It has a layer of its own. Your version wrote into series_overrides, which is the admin's edit layer. A
  filled-in description there hid any better one a later scan brought. It also refilled genres someone had cleared
  on purpose ({} means "cleared", NULL means "inherit"), and it could change what the 18+ switch hides. The filled-in
  values now sit below the scan: a series shows them only where its own value and any edit are both empty, a scan
  that brings real data wins straight away, and the 18+ filter judges the genres a series actually shows.
• It's off by default, like names. It asks only series that are kept updated, and only sources that aren't
  switched off, failing or cooling down (blockedNow). Each lookup gets the source's own time budget.
• It's a proper repair step (details), with counters, a Tasks line and an REPAIR_DETAILS_MAX knob (15 by
  default, your number). A series nobody can describe is asked again after a month, not every night.
• Text goes through cleanDescription and cleanGenres, as an add does. Followers in another language aren't
  asked, so a Spanish follower can't describe an English series in Spanish.
• The manual follow still asks at once, past the monthly wait.
• Switching it off takes back everything it filled in, covers included.

The tests are behaviour tests now: the series route, the 18+ filter, the cooldown and language rules, and the follow
route driven over HTTP.