feat: implement account service and db

db/auth.go

@@ -5,18 +5,12 @@ import (
 	"spend-sparrow/types"
 
 	"database/sql"
-	"errors"
 	"strings"
 	"time"
 
 	"github.com/google/uuid"
 )
 
-var (
-	ErrNotFound      = errors.New("value not found")
-	ErrAlreadyExists = errors.New("row already exists")
-)
-
 type Auth interface {
 	InsertUser(user *types.User) error
 	UpdateUser(user *types.User) error