feat(discussions): questions on published studysets, answered by learners
A learner asks about a published studyset, a topic in it, or one card, note or step of a release, and others answer, as on Stack Exchange (ADR 0013): questions and answers in the app's editor without images, sounds or videos, comments of up to 600 characters under the question and each answer. There are no votes: the asker accepts an answer, which comes first, then the oldest; the author's posts are marked. The instance reads from git's file list which topics a question's target sits in, so a topic lists what is asked within it and below it. Posts live in two server-only tables, written through endpoints, so the synced tables stay as they are and v0.17.0 keeps syncing. Everyone signed in reads; writing needs an identity and a public profile; the studyset's author hides posts and blocks people with feedback's blocks; a withdrawn studyset takes no new questions; anyone writes at most 30 posts an hour. A post with others' replies under it is emptied when deleted, else deleted; deletePerson deletes what a person wrote the same way, and a published studyset's deletion takes its discussions with it. The migration adds Serverpod's gen_random_uuid_v7(), discussion_post and discussion_seen with their indexes and cascading foreign keys, and changes nothing else. In the app, discussions open from a copy's studyset or topic menu, a studied card's "Ask about this", Explore's summary and the Publish sheet; the Profile tab's inbox lists those the person follows, and its count includes what is new in them. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
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