schema migration and account fixes

very close to rolling this out! just need to address some security concerns first

model/invite.go

@@ -0,0 +1,10 @@
+package model
+
+import "time"
+
+type Invite struct {
+    Code        string      `db:"code"`
+    CreatedByID string      `db:"created_by"`
+    CreatedAt   time.Time   `db:"created_at"`
+    ExpiresAt   time.Time   `db:"expires_at"`
+}