The following Bachelor/Master thesis topics are currently available:

Specialized Datalog CompilationBachelor
Performance Profiling Datalog Engines, Datasets, and QueriesBachelor/MasterPaper
How Relevant is the Type of Index Structure in a Modern Database System Really?Bachelor/Master
Iterative Construction of RTIndeXMaster
Paper
Interval Indexing using RTIndeXMaster
Paper

Note that some of the linked paper might only be accessible from within the University network (or via VPN).