fix deprecated macro sql_function

src/models.rs

@@ -16,9 +16,12 @@ use rocket::serde::{Deserialize, Serialize};
 use sha2::{Digest, Sha256};
 use std::collections::HashMap;
 
-sql_function!(fn random());
-sql_function!(fn floor(x: Float) -> Int4);
-sql_function!(fn float4(x: Int4) -> Float);
+#[declare_sql_function]
+extern "SQL" {
+    fn random() -> Text;
+    fn floor(x: Float) -> Int4;
+    fn float4(x: Int4) -> Float;
+}
 
 macro_rules! _get {
     ($table:ident) => {