enum class time_frequency : unsigned char {
annual = 1,
monthly = 2,
weekly = 3,
daily = 4,
hourly = 5,
minutely = 6,
secondly = 7,
millisecondly = 8,
// microsecondly = 9,
// nanosecondly = 10
};
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This enum specifies time frequency for index generation and otherwise. The names are self-explanatory.
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