Here are some interesting databases. Other resources will be updated from time to time during the season. Please do not hesitate to contact for more information.
Retired Horses 2017 (free)
Retired horses 2018 (free)
Horses Fleet 2019 (free)
Notes : Breeding (here the Sire) is a good indicator on ability of horses over a range of distance but it is not always the case. It depends also how they are handled by stable, track work, tactics and homogeneity of form in a race.
Sires normally reveal also the ability to perform relatively well after a long rest (more than 3 months) compared to other horses which need 1 or 2 runs before running into form. Another aspect of breeding is gate speed which eventually dictates decision making on race tactics.