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-`Redshift()` connections now adhere to almost all of the DBI specification when connecting to a Redshift cluster. BLOBs are not supported on Redshift, and there are limitations with enumerating temporary and persistent tables (#215, #326).
-`dbBegin()`, `dbCommit()` and `dbRollback()` gain `name` argument to support savepoints. An unnamed transaction must be started beforehand (#13).
-`dbWriteTable()` uses a transaction (#307).
-`dbSendQuery()` gains `immediate` argument. Multiple queries (separated by semicolons) can be passed in this mode, query parameters are not supported (#272).
-`dbConnect(check_interrupts = TRUE)` now aborts a running query faster and more reliably when the user signals an interrupt, e.g. by pressing Ctrl+C (#336).
-`dbAppendTable()` gains `copy` argument. If set to `TRUE`, data is imported via `COPY name FROM STDIN` (#241, @hugheylab).
- Postgres `NOTICE` messages are now forwarded as proper R messages and can be captured and suppressed (#208).
