Can share survey results with a secret shared key

db.go

@@ -255,6 +255,17 @@ CREATE TABLE IF NOT EXISTS categories(
   promo MEDIUMINT NOT NULL,
   expand BOOLEAN NOT NULL DEFAULT FALSE
 ) DEFAULT CHARACTER SET = utf8 COLLATE = utf8_bin;
+`); err != nil {
+		return err
+	}
+	if _, err := db.Exec(`
+CREATE TABLE IF NOT EXISTS survey_shared(
+  id_share INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
+  id_survey INTEGER NOT NULL,
+  secret BLOB NOT NULL,
+  count MEDIUMINT UNSIGNED NOT NULL DEFAULT 0,
+  FOREIGN KEY(id_survey) REFERENCES surveys(id_survey)
+) DEFAULT CHARACTER SET = utf8 COLLATE = utf8_bin;
 `); err != nil {
 		return err
 	}