fix: truncate remote actor username to VARCHAR(32); fix outbox URL by following 'first' link

crates/adapters/postgres/src/activitypub.rs

@@ -154,10 +154,16 @@ impl ActivityPubRepository for PgActivityPubRepository {
             return Ok(id);
         }
         let new_id = uuid::Uuid::new_v4();
-        let handle = actor_ap_url
+        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
+        } else {
+            format!("remote_{}", &new_id.to_string()[..13])
+        };
         sqlx::query(
             "INSERT INTO users(id,username,email,password_hash,local,ap_id,created_at,updated_at)
              VALUES($1,$2,$3,'',false,$4,NOW(),NOW()) ON CONFLICT(ap_id) DO NOTHING",