Summary

TableMutationEngine INSERT lists every grid column. GENERATED ALWAYS AS IDENTITY and generated columns reject the statement. Empty integer cells become '', not DEFAULT / omitted.

Scope

• Skip columns that are GENERATED ALWAYS / identity always (needs schema flags beyond column_default).
• Empty / NULL-sentinel cells: omit the column or emit DEFAULT when the column has a default / serial.
• Tests: GENERATED ALWAYS AS IDENTITY insert of a new row without sending id.

Out of scope

• MySQL AUTO_INCREMENT (same engine — OK to fix together if flags exist).