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.nolint: gocyclo.

MetaKeyExecutedQueryString is the key where the executed query should get stored.

global macros/substitutions for all sql datasources.

nolint:gocritic NewXormEngine is an xorm.Engine factory, that can be stubbed by tests.

SqlMacroEngine interpolates macros into sql.

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