Time-bucketed series of one metric for an exchange/symbol pair, gated by the key plan (venues, granularity, history, columns, rows). ROW QUALITY: every element of points carries two extra integers beside ts and value — quality, the row-quality bitmask ORed across the native 5-minute windows in that bucket (dirty if ANY window was), and qualityAll, the same bitmask ANDed (set only where EVERY window was). They are per point, not a parallel array. Decode them with the bits table on the qualityFlags entry of GET /v1/catalog. Nothing is ever hidden, filtered or nulled on account of quality: values are exactly as measured and these two integers tell you which to trust. A column a row never measured is null: a row rebuilt from the venue trade archive (TRADES_BACKFILLED) serves its book, enrichment and context columns as null, and coarser buckets average only the rows that measured them.