sample db things and updated invites table structure to allow for greater entropy pools

server/.env

@@ -0,0 +1 @@
+DATABASE_URL=mysql://freechat_dev:password@localhost:3306/freechat_sample_db

server/migrations/2020-02-04-083657_invites/down.sql

@@ -0,0 +1 @@
+-- This file should undo anything in `up.sql`

server/migrations/2020-02-04-083657_invites/up.sql

@@ -0,0 +1,7 @@
+-- Your SQL goes here
+CREATE TABLE IF NOT EXISTS `invites` (
+	`id` bigint NOT NULL,
+	`expires` datetime,
+	`uses` numeric(9,2),
+	PRIMARY KEY( `id` )
+);