{
  "schema_name": "row_index_parquet",
  "schema_version": 1,
  "artifact": "row_index.parquet",
  "format": "parquet",
  "row_grain": "one row per sample_key per resolution",
  "description": "Sample-level physical lookup table for WebDataset tar shards. Each row carries all five member byte ranges for one sample and resolution. Use sample_index.parquet when member-level rows are more convenient.",
  "primary_key": [
    "sample_key",
    "resolution"
  ],
  "columns": [
    {"name": "sample_key", "arrow_type": "string", "nullable": false},
    {"name": "match_id", "arrow_type": "string", "nullable": false},
    {"name": "round_id", "arrow_type": "string", "nullable": false},
    {"name": "round_idx", "arrow_type": "int32", "nullable": false},
    {"name": "pov_idx", "arrow_type": "int32", "nullable": false},
    {"name": "resolution", "arrow_type": "string", "nullable": false, "valid_values": ["720p", "360p"]},
    {"name": "video_width", "arrow_type": "int32", "nullable": false},
    {"name": "video_height", "arrow_type": "int32", "nullable": false},
    {"name": "shard_path", "arrow_type": "string", "nullable": false},
    {"name": "shard_id", "arrow_type": "int32", "nullable": false},
    {"name": "shard_size_bytes", "arrow_type": "int64", "nullable": false},
    {"name": "shard_sha256", "arrow_type": "string", "nullable": false},
    {"name": "tar_format", "arrow_type": "string", "nullable": false, "valid_values": ["ustar"]},
    {"name": "compression", "arrow_type": "string", "nullable": false, "valid_values": ["none"]},
    {"name": "json_member_name", "arrow_type": "string", "nullable": false},
    {"name": "json_offset", "arrow_type": "int64", "nullable": false},
    {"name": "json_length", "arrow_type": "int64", "nullable": false},
    {"name": "json_sha256", "arrow_type": "string", "nullable": false},
    {"name": "actions_member_name", "arrow_type": "string", "nullable": false},
    {"name": "actions_offset", "arrow_type": "int64", "nullable": false},
    {"name": "actions_length", "arrow_type": "int64", "nullable": false},
    {"name": "actions_sha256", "arrow_type": "string", "nullable": false},
    {"name": "state_member_name", "arrow_type": "string", "nullable": false},
    {"name": "state_offset", "arrow_type": "int64", "nullable": false},
    {"name": "state_length", "arrow_type": "int64", "nullable": false},
    {"name": "state_sha256", "arrow_type": "string", "nullable": false},
    {"name": "events_member_name", "arrow_type": "string", "nullable": false},
    {"name": "events_offset", "arrow_type": "int64", "nullable": false},
    {"name": "events_length", "arrow_type": "int64", "nullable": false},
    {"name": "events_sha256", "arrow_type": "string", "nullable": false},
    {"name": "mp4_member_name", "arrow_type": "string", "nullable": false},
    {"name": "mp4_offset", "arrow_type": "int64", "nullable": false},
    {"name": "mp4_length", "arrow_type": "int64", "nullable": false},
    {"name": "mp4_sha256", "arrow_type": "string", "nullable": false}
  ],
  "validation": [
    "primary key is unique",
    "all offsets are >= 0",
    "all lengths are > 0",
    "all SHA-256 fields are 64-character lowercase hex strings",
    "each member byte range resolves inside shard_path",
    "no column contains private player identifiers"
  ]
}