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A fast tier absent here has no fresher pin than the snapshot for this cell."},"stores":{"in_cube":true,"standalone_pin":{"tiers_present":["tier_era5_v1","tier_hrsl_v1","tier_ookla_v1","tier_q_v1","tier_u_v1","tier_v_v1","tier_w_v1"],"tiers_absent":[],"note":"trajectory/standalone witnesses are pinned (sha-verified) and by design NOT joined into the snapshot cube (§3); each carries its own source_window_end_utc (valid-time end)."},"grid_signal":{"tiers_present":["pois_grid_v1","roads_grid_v1","transit_grid_v1"],"tiers_absent":[],"note":"POI / transit / road grid-signal rollups are pinned (sha-verified), cell-keyed, and by design NOT joined into the snapshot cube (§3)."},"cell_imagery":{"tier":"cell_imagery_index_v1","mgrs_tile":"43QGB","present":true,"note":"monthly clearest cloud-free S2 selection for the cell's MGRS tile; a sha-pinned representation witness (tile-level selection), the cell crop is derived."}}},"error":null}}