This module provides the local Room database persistence layer for the application.
## Key Components
-**`MeshtasticDatabase`**: The main Room database class.
-**DAOs (Data Access Objects)**:
-`NodeInfoDao`: Manages storage and retrieval of node information (`NodeEntity`). Contains critical logic for handling Public Key Conflict (PKC) resolution and preventing identity wiping attacks.
-`PacketDao`: Handles storage of mesh packets.
-`ChatMessageDao`: Manages chat message history.
-**Entities**:
-`NodeEntity`: Represents a node on the mesh.
-`PacketEntity`: Represents a stored packet.
## Security Considerations
### Public Key Conflict (PKC) Handling
The `NodeInfoDao` implements specific logic to protect against impersonation and "wipe" attacks:
-**Wipe Protection**: Receiving an `is_licensed=true` packet (which normally clears the public key for compliance) will **not** clear an existing valid public key if one is already known. This prevents attackers from sending fake licensed packets to wipe keys from the DB.
-**Conflict Detection**: If a new key arrives for an existing node ID that conflicts with a known valid key, the key is set to `ERROR_BYTE_STRING` to flag the potential impersonation.
