A card of one's own: one_per_person, prefilled, replaced on send; no double sends; refusals are shown

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

src/content/mod.rs

@@ -343,6 +343,14 @@ pub struct Alternative {
     /// works (lysbue had the same flag).
     #[serde(default)]
     pub disabled: bool,
+    /// Each signed-in person keeps one record here: their own, which
+    /// sending again replaces. The form opens with what their record
+    /// says, a file left empty keeps the one already there, and the
+    /// older record leaves the list. For what a person says about
+    /// themselves - a card on the front page, a profile. Needs
+    /// `record_as`, and someone signed in.
+    #[serde(default)]
+    pub one_per_person: bool,
     #[serde(default)]
     pub consequence: Vec<String>,
     #[serde(default)]

src/content/validate.rs

@@ -512,6 +512,13 @@ pub fn validate_questions(
     }
     for question in questions.values() {
         for alternative in &question.alternatives {
+            if alternative.one_per_person && alternative.record_as.is_none() {
+                anyhow::bail!(
+                    "question {:?} alternative {:?}: one_per_person keeps each person's own record, and there is no record_as to keep it in",
+                    question.id,
+                    alternative.name
+                );
+            }
             if let Some(bucket) = &alternative.record_as {
                 let attended = read_buckets.contains(bucket)
                     || aggregates