Method AddError

pkg/session/store.go:1220–1235

AddError appends a recorded error item to a session at the next position. The error payload is stored as JSON in the message_json column, reusing the existing schema (item_type discriminates the row).

(ctx context.Context, sessionID string, e *Error)

// The error payload is stored as JSON in the message_json column, reusing the
// existing schema (item_type discriminates the row).
func (s *SQLiteSessionStore) AddError(ctx context.Context, sessionID string, e *Error) error {
	if sessionID == "" {
		return ErrEmptyID
	}

	errJSON, err := json.Marshal(e)
	if err != nil {
		return fmt.Errorf("marshaling error: %w", err)
	}

	_, err = s.db.ExecContext(ctx,
		`INSERT INTO session_items (session_id, position, item_type, message_json)
		 VALUES (?, (SELECT COALESCE(MAX(position), -1) + 1 FROM session_items WHERE session_id = ?), 'error', ?)`,
		sessionID, sessionID, string(errJSON))
	return err
}

// UpdateSessionTokens updates only token/cost fields.
func (s *SQLiteSessionStore) UpdateSessionTokens(ctx context.Context, sessionID string, inputTokens, outputTokens int64, cost float64) error {