Depot management

The nodes of an Eon Mode database fetch data from communal storage as needed to process queries, and cache that data locally on disk. The cached data of all nodes within a subcluster comprise that cluster's depot. The database uses depots to facilitate query execution: when processing a query, the database first checks the current depot for the required data. If the data is unavailable, the database fetches it from communal storage and saves a copy in the depot to expedite future queries. The database also uses the depot for load operations, caching newly-loaded data in the depot before uploading it to communal storage.