writePuts

Batch put: writes every row in rel, content from doc.

• The relation MUST contain either an _iid or an _id column.

• Per-row valid times come from the rel's _valid_from / _valid_to columns when present and non-null; otherwise the defaultValidFromMicros / defaultValidToMicros defaults apply.

Zero-width or inverted ranges will be rejected.

• The relation MUST contain a doc column - a struct vector containing the documents.