Use goose for migrations

postgres/ulid.go

@@ -0,0 +1,27 @@
+package postgres
+
+import (
+	"math/rand"
+	"time"
+
+	"github.com/oklog/ulid"
+)
+
+type UlidGenerator struct {
+	time    time.Time
+	entropy *rand.Rand
+}
+
+func NewGenerator() (*UlidGenerator, error) {
+	t := time.Time{}
+	ug := &UlidGenerator{
+		time:    t,
+		entropy: rand.New(rand.NewSource(t.UnixNano())),
+	}
+	return ug, nil
+}
+
+func (ug *UlidGenerator) New() string {
+	id := ulid.MustNew(ulid.Timestamp(time.Now()), ug.entropy)
+	return id.String()
+}