Goal: generate a few millions addresses and remember or store the private keys of each of them in an easy manner.
Using the most straighforward approach, that is, storing all of the addresses as "address / private key", alhtough will work, won't be optimal for me.
Q: Will a seed, or mnemonic, phrase help with this?
Namely, if I lose some of the private keys, will I be able to deduce them from a seed phrase? And how, in terms of code?