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A free open-source database server which endeavours to conform to the SQL standard and which is extensible with server-side functions and provides high performance, particularly to write-heavy applications.

PostgreSQL is:

  • highly conformant to the SQL specification
  • supports transactions wrapping database changes (CREATE TABLE, etc)
  • has a very full-featured set of types and functions related for time and date handling
  • allows in-database function extensions in a variety of languages

DAViCal has implicit dependencies on some of these features.