COPY classes FROM './classes.parquet' (FORMAT 'parquet', COMPRESSION 'zstd');
COPY classes_legacy FROM './classes_legacy.parquet' (FORMAT 'parquet', COMPRESSION 'zstd');
COPY courses FROM './courses.parquet' (FORMAT 'parquet', COMPRESSION 'zstd');
COPY courses_legacy FROM './courses_legacy.parquet' (FORMAT 'parquet', COMPRESSION 'zstd');