Need error handling here, and potentially a dedicated exception

defragment works differently for sqlite

The preg_match is not needed. Just use the escaper.

I'd probably go for DefragmentationException, since "optimize" is a very mysql specific term.

This should be ?string, only here, not in the parent.

That's the query for when $table is NULL

i can't find where this is used, 

is it needed?

null is missing

missing description and @covers

i don't think that is the position we usually use for @param and @dataProvider

missing @covers

missing @covers

Please add a return type

It can't the file is created in 2023

Let's just return if it isn't

No, the file is too new for that.

This doesn't actually tell us why the query failed. We do this with the logger in the DatabaseAccessObject

Nothing in the defragment method checks for valid table names.

If we don't care about the return of the method, there's no need to mock it.

Don't really care about this here. Changing the logging in the query method shouldn't cause this test to fail

ditto

This shouldn't be here

This shouldn't be removed for existing files

Probably good to log that passing a $table did nothing here.

Shouldn't this represent the table too?

The default will never be used since the parent method does not allow null.

No

Let's just make it like:
     * @param string $table This parameter is ignored when using SQLite, as VACUUM operates on the entire database.

We know the complete message here so no need to do a substring only match

We can come up with a better error message here. Don't need to end the string with : ;)

Ship It!