RelBench v1 databases

The original RelBench v1 relational databases, each in its own subdirectory in the self-describing manifest layout (plain parquet + manifest.yaml):

<dataset>/
  manifest.yaml                 # tables, primary keys, foreign-key graph, val/test timestamps
  schema.svg                    # ER diagram
  db/*.parquet                  # relational tables (plain parquet)
  tasks/<task>/manifest.yaml    # task spec (+ duckdb SQL for `forecast` tasks)
  tasks/<task>/{train,val,test}.parquet

Load with relbench.load_dataset("relbench/v1/<dataset>") / relbench.load_task("relbench/v1/<dataset>", "<task>"), or read any subdir's parquet directly with pandas/duckdb.