Database

Persistence and data storage.

SharedPreferences

User settings are stored via shared_preferences. All keys are centralized in PrefKeys (core/constants/app_constants.dart).

Session Storage

Sessions are serialized to JSON files in the app's documents directory:

<documents>/sessions/<session-id>.json

The SessionRepository handles saving, loading, listing, and deleting sessions.

Recording Storage

Audio recordings are stored as WAV or FLAC files:

<documents>/recordings/<session-id>/full.wav
<documents>/recordings/<session-id>/<clip-name>.wav

Model Cache

The ONNX model is extracted from Flutter assets to the documents directory on first launch:

<documents>/BirdNET+_V3.0-preview3_Global_5K-pruned_FP16.onnx

Subsequent launches load directly from disk.