v3.0.0

What's Changed

Postgres implementation

To deliver a more performant and transactional experience, the LDES Server moves from its trusted mongodb database
to a PostgreSQL database.
This however is only the first step in a peformance focus and more updates on the database structure might come.

For more info on how to upgrade, check out the configuration guide.

Change notes

• feat: add eventSource to admin api by @pj-cegeka in #1281
• feat: postgres implementation by @Yalz in #1289
• Fix: eventsource delete view postgres by @pj-cegeka in #1290
• chore: finalise 3.0.0 by @Yalz in #1292

Full Changelog: v2.15.0-alpha...v3.0.0-alpha