Create energy actor

central_backend/src/constants.rs

@@ -0,0 +1,7 @@
+use std::time::Duration;
+
+/// Energy refresh operations interval
+pub const ENERGY_REFRESH_INTERVAL: Duration = Duration::from_secs(30);
+
+/// Fallback value to use if production cannot be fetched
+pub const FALLBACK_PRODUCTION_VALUE: i32 = 5000;