Retrieve SPDD reference data from Haskell node for epochs 507, 508, 509

[shd]

Needed for Conway era testing

[lowhung]

Thank you @shd!

[whankinsiv]

Hi @shd I've got PR #510 up which adds spdd csv's for epochs 507-515 by pulling the data from db sync 😄.

[shd]

@whankinsiv Thank you, that's really cool -- Haskell node is quite slow with late epochs.