fn init(
env: soroban_sdk::Env,
fxdao_vault_contract: soroban_sdk::Address,
aquarius_contract: soroban_sdk::Address,
blend_pool_contract: soroban_sdk::Address,
)fn get_positions(
env: soroban_sdk::Env,
user: soroban_sdk::Address,
) -> soroban_sdk::Vec<(u32, i128)>