private void putRecordKeyOffset(int index, int offset) {
		buffer.putInt(HEADER_SIZE + (index * ENTRY_SIZE), offset);
	}
Store the record key offset within the buffer for the specified key index.
The record data immediately follows the stored key for the record.
@param index key index
@param offset key offset
Ghidra/Framework/DB/src/main/java/db/VarKeyRecordNode.java