rough ds for biometric data

finger: [{
    features: {
        minutiae: [{x, y,type,angle,quality}],
        matchingTree: [{x, y,}], // prolly requires more fields
        delta: [{x, y, angle}],
        core: [{x, y, angle}],
    },
    hand: 'left' | 'right',
    // other finger related data,
}, ...],
iris: [
    features: {
        crypts: [{x, y, quality}],
        wolffin_nodules: [{x, y, quality}],
        eyeColor: ['color',],
        featureX: [{x, y, quality}],
    },
    eye: 'left' | 'right',
]