app: person enrichment use case + staleness checks

crates/application/src/person/get.rs

@@ -1,11 +1,33 @@
 use crate::context::AppContext;
+use chrono::Utc;
 use domain::{
     errors::DomainError,
+    events::DomainEvent,
     models::{Person, PersonId},
 };
 
+const ENRICHMENT_TTL_DAYS: i64 = 90;
+
 pub async fn execute(ctx: &AppContext, id: PersonId) -> Result<Option<Person>, DomainError> {
-    ctx.repos.person_query.get_by_id(&id).await
+    let person = ctx.repos.person_query.get_by_id(&id).await?;
+    if let Some(ref p) = person {
+        if should_enrich(p) {
+            let _ = ctx.services.event_publisher.publish(
+                &DomainEvent::PersonEnrichmentRequested {
+                    person_id: id,
+                    external_person_id: p.external_id().value().to_string(),
+                },
+            ).await;
+        }
+    }
+    Ok(person)
+}
+
+fn should_enrich(p: &Person) -> bool {
+    match p.enriched_at() {
+        None => true,
+        Some(at) => (Utc::now() - at).num_days() >= ENRICHMENT_TTL_DAYS,
+    }
 }
 
 #[cfg(test)]