add timestamp to exchange rate and remove methods

Author: nicoburniske

api/src/api/fx.rs

@@ -6,23 +6,8 @@ pub struct ExchangeRate {
     pub currency_code: String,
     #[n(1)]
     pub rate: f32,
-}
-
-impl ExchangeRate {
-    pub fn new(currency_code: &str, rate: f32) -> Self {
-        Self {
-            currency_code: currency_code.to_string(),
-            rate,
-        }
-    }
-
-    pub fn currency_code(&self) -> &str {
-        &self.currency_code
-    }
-
-    pub fn rate(&self) -> f32 {
-        self.rate
-    }
+    #[n(2)]
+    pub timestamp: u64,
 }
 
 #[quantum_link]

api/src/api/quantum_link.rs

@@ -439,7 +439,11 @@ fn test_replay_check() {
     let envoy = QuantumLinkIdentity::generate();
     let passport = QuantumLinkIdentity::generate();
 
-    let fx_rate = ExchangeRate::new("USD", 0.85);
+    let fx_rate = ExchangeRate {
+        currency_code: "USD",
+        rate: 0.85,
+        timestamp: 0,
+    };
     let message = EnvoyMessage {
         message: QuantumLinkMessage::ExchangeRate(fx_rate),
         timestamp: 123456,