CREATE TABLE cards (
	id		TEXT PRIMARY KEY,	-- card ID, e.g "PT-1"
	from_user	TEXT,			-- sending user, e.g. "paulo"
	from_country	TEXT,			-- sender's country, e.g. "Portugal"
	to_user		TEXT,			-- receiving user, e.g. "meiadeleite"
	to_country	TEXT,			-- receiver's country, e.g. "Portugal"
	send_date	TEXT,			-- sent date, e.g. "2005-07-04"
	receive_date	TEXT,			-- received date, e.g. "2005-07-06"
	distance_km	INTEGER,		-- distance in km, e.g. "1"
	distance_miles	INTEGER,		-- distance in miles, e.g. "1"
	time		INTEGER,		-- card's travel time in days, e.g. "2"
	comments	INTEGER,		-- number of comments, e.g. "57"
	faves		INTEGER,		-- number of favorites, e.g. "567"
	faved_by	TEXT,			-- comma-separated list of users who favorited the card
	image_url	TEXT,			-- card image URL, e.g. "https://s3.amazonaws.com/static2.postcrossing.com/postcard/medium/484f7f6d1af1a700c504e4465f4cd8c3.jpg"
	description	TEXT			-- card description
);
