fix: make it possible to refer multiple people

classic copy/paste schema error.

updating D1 columns is apparently very hard, so I'm taking advantage of not having launched one more time...

migrations/0001_create_referrals_db.sql

@@ -10,7 +10,7 @@ CREATE TABLE IF NOT EXISTS users (
 -- "reward" tracks whether the referee has paid long enough for the referrer to be rewarded
 CREATE TABLE IF NOT EXISTS referrals (
   email TEXT PRIMARY KEY, 
-  refcode TEXT UNIQUE,
+  refcode TEXT,
   referred_at DATETIME DEFAULT CURRENT_TIMESTAMP,
   selected_plan TEXT,
   rewarded BOOLEAN DEFAULT false,

test/index.spec.ts

@@ -69,7 +69,30 @@ describe('the referral service', () => {
     const referredByResponseJson = await referredByResponse.json() as any
     expect(referredByResponseJson).toHaveProperty('refcode')
 
+    // create a second referral
+    const secondNewUserEmail = 'secondnewuser@example.com'
+    await SELF.fetch('http://example.com/referrals/create',
+      {
+        method: 'POST',
+        body: (() => {
+          const form = new FormData()
+          form.append('refcode', refcode)
+          form.append('email', secondNewUserEmail)
+          return form
+        })()
+      }
+    );
+
+    // now there should be two referrals
+    referralsResponse = await SELF.fetch(`http://example.com/referrals/${encodeURIComponent(refcode)}`);
+    referralsResponseJson = await referralsResponse.json() as any
+    expect(referralsResponseJson).toHaveProperty('referrals');
+    expect(referralsResponseJson.referrals).toBeInstanceOf(Array);
+    expect(referralsResponseJson.referrals).toHaveLength(2)
 
+    const secondReferredByResponse = await SELF.fetch(`http://example.com/referredby/${encodeURIComponent(secondNewUserEmail)}`);
+    const secondReferredByResponseJson = await secondReferredByResponse.json() as any
+    expect(secondReferredByResponseJson).toHaveProperty('refcode')
   });
 
   it('will not create a referral for the user who created the refcode', async () => {