fix: track last_event per relay on the dashboard

relay_url was being destructured as .. and thrown away, so
update_relay_last_event was called with an empty string and
matched no rows. Capture relay_url from the notification and
pass it through so each relay row gets its last_event updated.

src/nostr/reader.rs

@@ -101,9 +101,9 @@ async fn run_reader(cfg: Arc<Config>, pool: SqlitePool, connected: Arc<AtomicI32
             let blossom = blossom.clone();
             async move {
                 match notification {
-                    RelayPoolNotification::Event { event, .. } => {
+                    RelayPoolNotification::Event { relay_url, event, .. } => {
                         match event.kind.as_u16() {
-                            2003 => handle_torrent(&pool, &cfg, &enricher, blossom.as_deref(), &event).await,
+                            2003 => handle_torrent(&pool, &cfg, &enricher, blossom.as_deref(), relay_url.as_str(), &event).await,
                             30004 => handle_curation_set(&pool, &event).await,
                             1984 => handle_report(&pool, &cfg, &event).await,
                             _ => {}
@@ -128,7 +128,7 @@ async fn run_reader(cfg: Arc<Config>, pool: SqlitePool, connected: Arc<AtomicI32
     connected.store(0, Ordering::Relaxed);
 }
 
-async fn handle_torrent(pool: &SqlitePool, cfg: &Config, enricher: &Enricher, blossom: Option<&BlossomClient>, event: &nostr_sdk::Event) {
+async fn handle_torrent(pool: &SqlitePool, cfg: &Config, enricher: &Enricher, blossom: Option<&BlossomClient>, relay_url: &str, event: &nostr_sdk::Event) {
     match super::parser::parse(event) {
         Ok(rec) => {
             // WoT / block / mute check
@@ -166,7 +166,7 @@ async fn handle_torrent(pool: &SqlitePool, cfg: &Config, enricher: &Enricher, bl
                 Err(e) => error!(event_id = %event.id, "db insert failed: {e}"),
                 Ok(()) => {
                     debug!(event_id = %event.id, title = %rec.title, "indexed torrent");
-                    let _ = db::update_relay_last_event(pool, "", event.created_at.as_secs() as i64).await;
+                    let _ = db::update_relay_last_event(pool, relay_url, event.created_at.as_secs() as i64).await;
 
                     if enricher.enabled() && rec.tmdb_id.is_empty() {
                         let enricher = enricher.clone();