periodic checkpoint: Don't checkpoint at startup

Currently there's no way to disable checkpoint but one can
emulate it by enabling periodic checkpoint with really long
interval between checkpoints.

Unfortunately, current implementation runs checkpoint first
before waiting for the interval to pass.

This change makes the periodic checkpoint to first wait
and only after that checkpoint.

Signed-off-by: Piotr Jastrzebski <piotr@chiselstrike.com>

Author: haaawk

libsql-server/src/lib.rs

@@ -368,6 +368,8 @@ where
     tracing::info!("setting checkpoint interval to {:?}", period);
     let mut interval = interval(period);
     interval.set_missed_tick_behavior(MissedTickBehavior::Delay);
+    // Make sure that we don't checkpoint immediately after startup
+    interval.tick().await;
     let mut retry: Option<Duration> = None;
     loop {
         if let Some(retry) = retry.take() {