```json { "table_name": "neal_readings", "table_type_tags": [ {"tag": "dimension", "confidence": 0.75}, {"tag": "misc", "confidence": 0.25} ], "primary_type": "dimension", "insufficient_evidence": false, "entity": { "columns": ["id"], "unique_per_row": true }, "time_axis": { "columns": ["observed_at"], "kind": "event_time" }, "reasoning": "The entity id is unique per row (Uniqueness 1.000, RPUV 1.00). Each row is a distinct statistical reading about a source table's column grouping — the composite (source_table, group_axes, measure, reading_kind) defines what the reading IS, and observed_at is an attribute timestamp marking when the statistic was computed, not an axis ordering actions or changes of the reading itself. The rows are catalog entries of computed metrics, not events or state transitions: dimension. The synthetic grain (group_axes + measure + reading_kind combinations) and lack of a natural entity beyond the artificial id weakens confidence slightly." } ```