Read-only view of a customer's reward program: the funded pool balance (read
from the DB-indexed solana_account_transaction, never a live RPC) and the
leverage of owed rewards against it. Resolves the pool ledger_account via
the reward_program.ledger_account_id FK.
Funded balance + leverage for a customer's reward program.
Returns null when the customer has no reward program, or the program's
ledger_account_id hasn't been linked yet (pre-backfill — treated as "not
fully provisioned", same as "no program").
Read-only view of a customer's reward program: the funded pool balance (read from the DB-indexed
solana_account_transaction, never a live RPC) and the leverage of owed rewards against it. Resolves the poolledger_accountvia thereward_program.ledger_account_idFK.