core/mvcc: Make Clippy happy

core/mvcc/database/mod.rs

@@ -630,7 +630,7 @@ impl<Clock: LogicalClock, T: Sync + Send + Clone + Debug + 'static> Database<Clo
             }
         }
 
-        let tx = tx_unlocked.value().write().unwrap();
+        let tx = tx_unlocked.value().read().unwrap();
         tx.state.store(TransactionState::Terminated);
         tracing::trace!("TERMINATE {tx}");
         // FIXME: verify that we can already remove the transaction here!

core/mvcc/mod.rs

@@ -47,8 +47,6 @@ mod tests {
 
     static IDS: AtomicU64 = AtomicU64::new(1);
 
-    static START: Once = Once::new();
-
     #[test]
     fn test_non_overlapping_concurrent_inserts() {
         // Two threads insert to the database concurrently using non-overlapping