The "in the past" problem can be solved in a number of ways (misc locking patterns). Have played with a number of such schemes in mssql-changefeed (see sibling

The "in the past" problem can be solved in a number of ways (misc locking patterns). Have played with a number of such schemes in mssql-changefeed (see sibling post). CDC has 20-40 second delay for mssql which makes it unusable for many purposes.