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.

global macros/substitutions for all sql datasources.

SqlMacroEngine interpolates macros into sql.

SqlTableRowTransformer transforms a query result row to RowValues with proper types.