ALTERTABLE`poll`ADDCOLUMN`explanation`varchar(255)DEFAULTNULLCOMMENT'Text that is shown when a user chooses an incorrect answer or taps on the lamp icon in a quiz-style poll, 0-200 characters'AFTER`correct_option_id`;
ALTERTABLE`poll`ADDCOLUMN`explanation_entities`textDEFAULTNULLCOMMENT'Special entities like usernames, URLs, bot commands, etc. that appear in the explanation'AFTER`explanation`;
ALTERTABLE`poll`ADDCOLUMN`open_period`intUNSIGNEDDEFAULTNULLCOMMENT'Amount of time in seconds the poll will be active after creation'AFTER`explanation_entities`;
ALTERTABLE`poll`ADDCOLUMN`close_date`timestampNULLDEFAULTNULLCOMMENT'Point in time (Unix timestamp) when the poll will be automatically closed'AFTER`open_period`;