It is surprised to come across several systems/services that happen to built on top of postgreSQL. Here is a quick summary of these.
|AWS Redshift||data warehousing|
|TimeScale||time series database|
AWS Redshift: Redshift is a data warehousing service offered by AWS. It is built on postgreSQL, with a new columnar storage engine. The use of columnar storage is expected to provide better query performance and better compression.
TimeScale: TimeScale DB is a new time series database. It basically is a cluster of postgreSQL databases. Data is partitioned based on data source and time intervals to facilitate faster query processing, with each query accessing local data as much as possible.