Struct InstanceMetadata 

pub struct InstanceMetadata {
    pub device_key: PrivateKey,
    pub users_db: ID,
    pub databases_db: ID,
    pub sync_db: Option<ID>,
}

Persistent metadata for an Eidetica instance.

This struct consolidates all instance-level state that needs to persist across restarts:

• The device signing key (cryptographic identity)
• System database root IDs
• Optional sync database root ID

The presence of InstanceMetadata in a backend indicates an initialized instance. A backend without metadata is treated as uninitialized and may trigger instance creation.

Fields

device_key: PrivateKey

Device signing key - the instance’s cryptographic identity.

This key is generated once during instance creation and persists for the lifetime of the instance. It is used to sign system database entries and for sync identity.

users_db: ID

Root ID of the _users system database.

This database tracks user accounts and their associated data.

databases_db: ID

Root ID of the _databases system database.

This database tracks metadata about all databases in the instance.

sync_db: Option<ID>

Root ID of the _sync database (None until enable_sync() is called).

This database stores all sync-related state.

Trait Implementations

impl Clone for InstanceMetadata

fn clone(&self) -> InstanceMetadata

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for InstanceMetadata

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for InstanceMetadata

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for InstanceMetadata

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.