Added macro for handling both transaction and pooled connection

apps/api/src/helpers/database.rs

@@ -0,0 +1,13 @@
+#[macro_export]
+macro_rules! with_conn {
+    // Usage: with_conn!(connection, tx_option, ident, |conn|-> { ... })
+    ($conn:expr, $tx:expr, $ident:ident, $body:block) => {{
+        if let Some(t) = $tx {
+            let $ident = t;
+            $body
+        } else {
+            let $ident = $conn;
+            $body
+        }
+    }};
+}