Add a unique constraint for the given table.
@param table must be primary table or secondary table name added a priori to this receiver.
@param unique the unique constraint. null means no-op.
@deprecated
Adds a pair, ensuring no duplicate key xor value already exists in the current search target column.
@param key the key
@param value the value
@return true or false depending on success
Adds a pair, ensuring no duplicate key xor value already exists in the current search target column.
@param key the key
@param value the value
@return true or false depending on success
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