https://fedidb.com/ dansup fedi-db. I haven't used it much. no idea about backend/api.

nah talking about lemmy search specifically. probably missing some configs. https://mastodon.social/@dansup has some indexing going on somewhere. prolific dev. i've been using https://fediverse.observer/ occasionally. good to know about search, thanks.

shove a link in a menu somewhere. lemmy cross-post search could benefit from a good index. it only seems to know about a few instances.