fix: revert grace period, increase poll interval to 500ms to prevent doubles without adding jitter

apps/api/src/routes/internal.ts

@@ -48,7 +48,7 @@ export const internal = new Elysia({ prefix: "/internal", detail: { hide: true }
       ) last ON true
       WHERE m.enabled = true
         AND (last.checked_at IS NULL
-          OR last.checked_at < now() - (m.interval_s || ' seconds')::interval - interval '200ms')
+          OR last.checked_at < now() - (m.interval_s || ' seconds')::interval)
     `;
     return monitors;
   })

apps/monitor/src/main.rs

@@ -41,6 +41,6 @@ async fn main() -> Result<()> {
             Ok(n) => { if n > 0 { info!("Spawned {n} checks"); } },
             Err(e) => error!("Check cycle failed: {e}"),
         }
-        sleep(Duration::from_millis(50)).await;
+        sleep(Duration::from_millis(500)).await;
     }
 }