> ## Documentation Index
> Fetch the complete documentation index at: https://docs.telescope.training/llms.txt
> Use this file to discover all available pages before exploring further.

# Database

All training data synced from W\&B is stored in a local DuckDB database at `~/.telescope/`. You can change this location with the `TELESCOPE_DATA_DIR` environment variable.

## Compression

Over time the database can grow large. The **Database** option in the sidebar menu shows the current database size and lets you compress it. Compression can reduce size by 20–30% depending on the data, by re-exporting and re-importing the database with optimized storage.

During compression, syncs are paused automatically and resume when it finishes.