createQuietHoursRule method
Adds a rule of userId from a QuietHoursRuleInput body and appends the complete
list in quiet_hours.updated (createQuietHoursRule, 13 3.4). Throws 400 validation_failed for weekdays outside 1 to 127 or a time that is not HH:MM.
Implementation
JsonMap createQuietHoursRule(String userId, JsonMap body) =>
_createRule(userId, body);