TIME_RULE_VALUE is an 18 digit numerical field used to hold a variable or fixed amount for a [time rule|TIME RULES].
The context in which this column is used may change depending on the [time rule type|TIME_RULE_TYPE].  For example, for the time rule [Daily Top Up|TR_DAILY_TOP_UP], the column name for Value changes to Max Top Up Hrs since it holds the number of hours to top up to. The time rule, [OT Consecutive|TR_OT_CONSECUTIVE], uses the Value to hold the number of consecutive days worked.