This function validates the structure of a spreadsheet file by checking its sheets, primary keys (PKs), and foreign keys (FKs). If a template file is provided, it also checks the column definitions.
check_tab(file_path, template_path = NULL)
Logical. Returns "TRUE" but warns of possible errors.
Character. Path to the spreadsheet file to be validated.
Character (optional). Path to the template file for validation. If `NULL`, only the sheet structure is checked.