The DFG has adopted flexible extension options for the various funding programmes. Constantly updated information can be found on the DFG website. In particular, fixed-term employment contracts of doctoral candidates in DFG Research Training Groups can be extended to up to 48 months. It should be possible to apply for additional funding due to the pandemic at the end of the project. Corona-Updates on the website of the DFG.
Additional financial support for DFG-funded research during the corona pandemic (Information in German).