private void insertEntry(int index, long key, int bufferId) {

		int start = BASE + (index * ENTRY_SIZE);
		int end = BASE + (keyCount * ENTRY_SIZE);
		buffer.move(start, start + ENTRY_SIZE, end - start);
		buffer.putLong(start, key);
		buffer.putInt(start + KEY_SIZE, bufferId);

		setKeyCount(keyCount + 1);
	}
Insert the child node entry (key and buffer ID) associated with the specified key index.
All entries at and after index are shifted right to make space for new entry.
The node key count is adjusted to reflect the addition of a child.
@param index child key index
@param key child node key
@param bufferId child node buffer ID
Ghidra/Framework/DB/src/main/java/db/LongKeyInteriorNode.java