fixup! For performance, switch to a row count estimate for users and devices

Author: reivilibre

crates/syn2mas/src/migration.rs

@@ -161,9 +161,7 @@ pub async fn migrate(
     // `(MAS user_id, device_id)` mapped to `compat_session` ULID
     let mut devices_to_compat_sessions: HashMap<(Uuid, CompactString), Uuid> =
         HashMap::with_capacity(
-            counts
-                .devices
-                .try_into()
+            usize::try_from(counts.devices)
                 .expect("More than usize::MAX devices — unable to handle this many!")
             // Oversize the capacity, because the count is only an estimate and
             // we would like to avoid a reallocation