app/core/config.py:28:    ENCRYPTION_KEY: str = ""  # Fernet key; auto-generated & persisted if empty
app/core/config.py:81:    @field_validator("ENCRYPTION_KEY", mode="after")
app/core/encryption.py:3:A single Fernet key (from settings.ENCRYPTION_KEY or a persisted generated key)
app/core/encryption.py:12:_KEY_FILE = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))), ".encryption_key")
app/core/encryption.py:16:    env_key = settings.ENCRYPTION_KEY