The default database location is ~/.dstask/, but can be configured by the
environment variable DSTASK_GIT_REPO.
The format on disk stores the tasks in a directory according to the task status, with each task stored under a yaml file with a UUID4 as the filename. UUIDs are used to avoid conflicts when synchronising. The yaml schema is defined by this Go struct: https://github.com/naggie/dstask/blob/c00bc97c3f0132f1d291fdbe33dfb06e02ca6ef6/task.go#L18
This way only non-resolved tasks are actually loaded for most commands, so performance is stable even with a large task history.
The ID presented to the user is simply a sequential ID. IDs are re-used when tasks are resolved; tasks store their preferred ID for consistency across different systems.
TODO elaborate with examples.