Function config_dir_store_key 

pub fn config_dir_store_key(config_dir: &Path) -> String

Stable hex key for a config dir’s durable store, independent of the Rust release.

config_dir_hash hashes through DefaultHasher, whose algorithm std does not promise across releases; a nightly bump would silently open a new empty store and orphan every cron and subscription. The durable store therefore keys on a SHA-256 of the canonicalised path. The lock keeps config_dir_hash on purpose: a changed digest there would let a new binary miss a running old process’s lock.