Deleting from capitalized time-series doesn't work

Steps to reproduce:

1. Insert a data point into a time-series named `Test` (note the capital letter)
2. Execute `SELECT * FROM Test` to confirm the data point got written
3. Execute `DELETE FROM Test`
3. Execute `SELECT * FROM Test` again. Notice that the point is still there.

At the same time `DROP SERIES Test` **does** work.