Kostas,
you have id defined as INTEGER PRIMARY KEY so id becomes the rowid and
thus the index leaf nodes are the table rows themselves. So I/O-wise
there should not be much of a difference in your case.
But I already noticed in the past that the query planner puts a heavy
weight on INTEGER PRIMARY KEY indexes so it always picks those if they
are involved in the WHERE-clause, no matter if other indexes would suit
better. Running ANALYZE doesn't help since it does not create
statistical data for the implicit PRIMARY KEY index.
regards
Gerd
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