Add db/errors.go, move error definitions to it

pkg/db/connect.go

@@ -22,10 +22,6 @@ var (
 	version_number uint
 )
 
-var (
-	ErrTargetExists = errors.New("target already exists")
-)
-
 // Colors for terminal output
 const (
 	ColorReset  = "\033[0m"
@@ -51,7 +47,7 @@ func Create(path string) (*sqlx.DB, error) {
 	// First check if the path already exists
 	_, err := os.Stat(path)
 	if err == nil {
-		return nil, ErrTargetExists
+		return nil, ErrDatabaseAlreadyExists
 	} else if !errors.Is(err, os.ErrNotExist) {
 		return nil, fmt.Errorf("path error: %w", err)
 	}