ConvertSqlTimeColumnToEpochMs converts column named time to unix timestamp in milliseconds to make native datetime types and epoch dates work in annotation and table queries.

ConvertSqlValueColumnToFloat converts timeseries value column to float.

EpochPrecisionToMs converts epoch precision to millisecond, if needed.

SqlEngine is a wrapper class around xorm for relational database data sources.

SqlMacroEngine interpolates macros into sql.