Cargo fix.

src/main.rs

@@ -75,7 +75,7 @@ async fn main() {
         warn!("APP_REPL_TOKEN not set: /api/replication/changes is disabled");
     }
 
-    let sync_cfg = SyncConfig {
+    let _sync_cfg = SyncConfig {
         poll_interval: Duration::from_secs(env_parse("APP_SYNC_INTERVAL_SECS", 5)),
         max_backoff: Duration::from_secs(env_parse("APP_SYNC_MAX_BACKOFF_SECS", 60)),
         batch: env_parse("APP_SYNC_BATCH", 200i64).clamp(1, 1000),