prf::config::IConfigBackend class
#include <config/backend.hpp>

Abstract storage backend used by ConfigStore.

The backend owns persistence details, while ConfigStore owns schema validation, defaults, and dirty-state logic.

Derived classes

class PicoLittleFsConfigBackend final: PicoSDK flash backend that stores config section files in LittleFS.
class UnixFileConfigBackend final

auto read_file(std::string_view relative_path, std::vector<uint8_t>* out_bytes) -> ConfigReadStatus pure virtual: Reads raw section payload bytes.
auto remove_file(std::string_view relative_path) -> bool pure virtual: Removes one persisted file.
auto write_file_atomic(std::string_view relative_path, const std::vector<uint8_t>& bytes) -> bool pure virtual: Writes bytes using backend-specific atomic replacement.

Reads raw section payload bytes.

Parameters
relative_path	Backend-relative file path, for example `npr1.cbor`.
out_bytes	Output byte buffer that receives file contents.
Returns	`Ok` when file was read, `NotFound` when file does not exist, or `Error` on storage failure.

Removes one persisted file.

Missing files should be treated as success by concrete backends.

Writes bytes using backend-specific atomic replacement.

The old content must remain intact when this method fails.