schema/session_schema.md

Session metadata schema

Per-clip metadata/*.json includes a session object. One session per delivered clip.

Fields

Field	Type	Description
session_id	string	e.g. GGN_20260618_S01 (date + clip rank)
capture_date	string	ISO date YYYY-MM-DD
timezone	string	IANA tz, e.g. Asia/Kolkata
collector_id	string	Anonymous worker ID, e.g. WRK_846159
clips_in_session	int	1 for current sample pack
indoor_outdoor	string	indoor or outdoor
lighting	string	tubelight_cfl, mixed, or natural
mount_type	string	head_mounted_via_headband_egocentric
task_id	string	Dominant task from action_segments.jsonl
time_reference	string	clip_start — timestamps relative to deliverable MP4
utc_available	bool	false unless wall-clock from source file is added

Related files

Path	Purpose
sessions/{session_id}.json	Session record + link to clip and timestamps CSV
sessions/session_index.json	Index of all sessions
annotations/timestamps/{clip}_timestamps.csv	frame_idx, timestamp_sec (clip-relative)

Aligning annotations

• action_segments.jsonl start_sec / end_sec — same clip-relative clock as timestamps.csv
• Keypoints / object boxes timestamp_sec — same clock