Switch connections-list database to using TupleBox

  * Use the internal database type, same as for the world state
  * Should be / could be a bit faster, but is also more consistent.
  * In the process found a bug in the tuple store with secondary indices

crates/daemon/src/connections.rs

@@ -1,8 +1,10 @@
+use std::time::{Duration, SystemTime};
+
+use uuid::Uuid;
+
 use moor_kernel::tasks::sessions::SessionError;
 use moor_values::var::objid::Objid;
 use rpc_common::RpcRequestError;
-use std::time::{Duration, Instant, SystemTime};
-use uuid::Uuid;
 
 pub const CONNECTION_TIMEOUT_DURATION: Duration = Duration::from_secs(30);