The pre-template world used find_library_files(post_id) — a
filesystem walk matching files whose stem equals str(post_id) — for
"is this post saved?" checks across the bookmark dot indicator,
browse dot indicator, Unsave menu visibility, etc. With templated
filenames (e.g. 12345_hatsune_miku.jpg) the stem no longer equals
the post id and the dots silently stop lighting up.
Two new helpers, both indexed:
- is_post_in_library(post_id) -> bool single check, SELECT 1
- get_saved_post_ids() -> set[int] batch fetch for grid scans
Both go through library_meta which is keyed by post_id, so they're
format-agnostic — they don't care whether the on-disk filename is
12345.jpg, mon3tr_(arknights).jpg, or anything else, as long as the
save flow wrote a meta row. Every save site does this since the
unified save_post_file refactor landed.
pax
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