How to clear or move files residing on path :/var/lib/pgsql96/data/base/ on Matillion EC2 instance for Snowflake. ? We can see files are created since last 3 years and consuming 90 of the space of mount point, Please suggest

Matillion ETL
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How to clear or move files residing on path :/var/lib/pgsql96/data/base/ on Matillion EC2 instance for Snowflake. ? We can see files are created since last 3 years and consuming 90 of the space of mount point, Please suggest.