check if instance exists in DB

outcomes_tracker.sql

@@ -1,5 +1,5 @@
 CREATE TABLE instances (
-    id integer,
+    id serial,
     instance_id integer,
     course character varying(64),
     graduation_date character varying(128),

scrape.js

@@ -64,7 +64,7 @@ const scrapeInstance = async (link, page) => {
 	const res = await client.query('SELECT $1::text as message', ['Connected to Postgres'])
 	console.log(res.rows[0].message)
 
-	const browser = await puppeteer.launch();
+	const browser = await puppeteer.launch({headless:'new'});
 	const page = await browser.newPage();
 	await page.goto('https://outcomes.generalassemb.ly/');
 	await page.type('input[type="email"]', 'matt.huntington@generalassemb.ly');
@@ -97,7 +97,14 @@ const scrapeInstance = async (link, page) => {
 	const instanceLinks = await page.$$('tr td:nth-child(2) a');
 
 	for(instance of instanceLinks){
-		await scrapeInstance(instance, page);
+		
+		const linkHTML = await instance.getProperty('href');
+		const href = await linkHTML.jsonValue()
+		const instanceID = href.match(/[0-9]*$/)[0];
+		const res = await client.query(`SELECT * FROM instances WHERE instance_id = ${instanceID}`);
+		if(res.rowCount === 0){
+			await scrapeInstance(instance, page);
+		}
 	}
 
 	console.log('done');