Update structure to domain driven architecture.

db/models.go

@@ -0,0 +1,24 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+
+package db
+
+import (
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+type RefreshToken struct {
+	ID        int64              `json:"id"`
+	UserID    int64              `json:"user_id"`
+	TokenHash string             `json:"token_hash"`
+	CreatedAt pgtype.Timestamptz `json:"created_at"`
+	ExpiresAt pgtype.Timestamptz `json:"expires_at"`
+}
+
+type User struct {
+	ID        int64              `json:"id"`
+	Email     string             `json:"email"`
+	Password  string             `json:"password"`
+	CreatedAt pgtype.Timestamptz `json:"created_at"`
+}