FLASH is DESY's (and the world's first) free-electron laser user facilily. Within the FLASH2020+ project, the multi-beamline FEL facility FLASH has upgraded its primary arm, FLASH1, to accommodate the first externally seeded beamline, with 1 MHz repetition rate in burst mode. We also adapt the diagnostics on both the photon and electron beam sides to match this goal. Stability is a key factor. A stable seeded source opens the door to many new experiments. Through the ErUM-Data and LEAPS-funded proposals, we develop resource-efficient and reliable Al and machine learning methods to advance ML for photon science applications while keeping large-scale research more sustainable. We are looking for a motivated postdoc to join the team and take an essential role in advancing the capabilities of FLASH with a focus on the externally seeded FLASH1 FEL branch.