advancements in tests and storing messages

back/db/utils/addressQueries.js

@@ -0,0 +1,20 @@
+const queryAddress = (type) => `
+    LEFT JOIN (
+        SELECT address_field.address_id, address_field.message_id
+        FROM address_field 
+        INNER JOIN field_name 
+        WHERE 
+            field_name.field_id = address_field.field_id AND
+            field_name.field_name = '${type}'
+    )
+`;
+
+const queryFromId = queryAddress("from");
+const queryToId = queryAddress("to");
+const queryCcId = queryAddress("cc");
+
+module.exports = {
+    queryFromId,
+    queryToId,
+    queryCcId
+}