feat: transaction query pagination

src/model/req.rs

@@ -2,8 +2,14 @@ use std::fmt;
 use std::str::FromStr;
 use serde::{de, Deserialize, Deserializer};
 
+pub const QUERY_ORDER_INCREASE:i32 = 0;
+pub const QUERY_ORDER_INVERT:i32 = 1;
+
+pub const MAX_QUERY_LIMIT:i32 =1000;
+
+
 #[derive(Debug, Deserialize)]
-pub struct Params {
+pub struct GetAmountParams {
     #[serde(default, deserialize_with="empty_string_as_none")]
     pub transaction_id: Option<i64>,
 }
@@ -21,3 +27,9 @@ where
         Some(s) => FromStr::from_str(s).map_err(de::Error::custom).map(Some),
     }
 }
+
+#[derive(Deserialize)]
+pub struct GetTransactionsQueryParams {
+    pub start: Option<i64>,
+    pub limit: Option<i32>,
+}