Module persist 

Common persistence helpers: atomic JSON file writes with tmp + rename. Sensitive files can opt-in to 0600 permissions on Unix.

Functions

atomic_write_json

Atomically write a serializable value to path using tmp + rename. Creates parent directories if needed.

atomic_write_json_with_perms

Atomically write a serializable value to path using tmp + rename. If restrict_perms is true, sets file permissions to 0o600 on Unix.

read_json

Read and deserialize JSON from path. Returns Ok(None) if the file does not exist.

remove_file_if_exists

Remove a file if it exists. No error if not found.

tmp_path_for

Helper: build a tmp path for a given file path.