Added comments on connection functions.

Author: mesherrera

model/mongoose-connect.js

@@ -1,6 +1,7 @@
 const mongoose = require('mongoose');
 const { services } = require('../user/settings.json');
 
+// Mongoose connection wrapped in function that takes the index of the selected database as the parameter. This index is used to target the correct database for querying.
 const connectMongoose = (i) => {
   const URI = services[i][2];
   return mongoose.connect(URI, { useNewUrlParser: true, useUnifiedTopology: true }, (err) => {

model/sql-connect.js

@@ -1,6 +1,7 @@
 const { Pool } = require('pg');
 const { services } = require('../user/settings.json');
 
+// SQL connection wrapped in function that takes the index of the selected database as the parameter. This index is used to target the correct database for querying.
 const connectSQL = (i) => {
   const URI = services[i][2];
   return new Pool({