| { |
| "schema_version": "1.0.0", |
| "format": "newline-delimited JSON compressed with GZIP", |
| "timestamp_contract": { |
| "timestamp_monotonic_ns": "Primary ordering clock from Android sensor hardware or elapsedRealtimeNanos", |
| "timestamp_epoch_ms": "Wall clock for cross-device alignment; clock changes must be considered" |
| }, |
| "fields": { |
| "sequence": "int64, repository order", |
| "source_sequence": "int64, service acquisition order; -1 for UI annotations", |
| "record_type": "sensor | location | battery | annotation_auto | annotation_manual", |
| "timestamp_epoch_ms": "int64 milliseconds since Unix epoch", |
| "timestamp_monotonic_ns": "int64 nanoseconds since boot", |
| "sensor": "stable sensor key", |
| "accuracy": "Android sensor accuracy or estimated location accuracy", |
| "unit": "unit contract for values", |
| "values": "array<number|null>; source sensor values retain Float32 precision, location retains Float64", |
| "known_activity": "protocol label supplied by contributor", |
| "auto_motion": "coarse automatic estimate, not ground truth", |
| "phase": "baseline | pre_failure | failure | recovery", |
| "event_type": "nullable event label", |
| "confidence": "nullable heuristic confidence 0..1", |
| "details": "nullable explanation" |
| }, |
| "integrity": { |
| "blocks.jsonl": "SHA-256 chain over canonical JSONL bytes in blocks", |
| "integrity.json": "SHA-256 and byte size for every exported artifact" |
| } |
| } |
