fix: remote actor display names in thought cards — use last URL segment as username, resolve display_name after intern

crates/adapters/postgres/src/activitypub.rs

@@ -154,13 +154,18 @@ impl ActivityPubRepository for PgActivityPubRepository {
             return Ok(id);
         }
         let new_id = uuid::Uuid::new_v4();
-        let raw = actor_ap_url
-            .path()
-            .trim_start_matches('/')
-            .replace('/', "_");
-        // username column is VARCHAR(32); truncate long paths (e.g. UUID-based actor URLs)
-        let handle = if raw.len() <= 32 {
-            raw
+        // Use the last path segment as username (e.g. /users/alice → "alice").
+        // Falls back to a random short id for long segments (e.g. UUID-based actor URLs).
+        // username column is VARCHAR(32).
+        let last_seg = actor_ap_url
+            .path_segments()
+            .and_then(|mut s| s.next_back())
+            .unwrap_or("")
+            .to_string();
+        let handle = if last_seg.is_empty() {
+            format!("remote_{}", &new_id.to_string()[..13])
+        } else if last_seg.len() <= 32 {
+            last_seg
         } else {
             format!("remote_{}", &new_id.to_string()[..13])
         };
@@ -185,6 +190,25 @@ impl ActivityPubRepository for PgActivityPubRepository {
             })
     }
 
+    async fn update_remote_actor_display(
+        &self,
+        user_id: &UserId,
+        display_name: Option<&str>,
+        avatar_url: Option<&str>,
+    ) -> Result<(), DomainError> {
+        sqlx::query(
+            "UPDATE users SET display_name=$1, avatar_url=$2, updated_at=NOW()
+             WHERE id=$3 AND local=false",
+        )
+        .bind(display_name)
+        .bind(avatar_url)
+        .bind(user_id.as_uuid())
+        .execute(&self.pool)
+        .await
+        .map_err(|e| DomainError::Internal(e.to_string()))
+        .map(|_| ())
+    }
+
     async fn accept_note(
         &self,
         ap_id: &Url,