Limitations of Zend_Db_Table::save on missing primary key
Goal Determine how Zend Framework 2’s Zend_Db_Table::save reacts when a caller supplies a primary‑key value that does not match any existing row, and whether retrying the same operation can create duplicate records. Constraints & Uncertainty Framework 2 documentation specifies that save performs an INSERT if the primary‑key is null or not found, otherwis
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