paymentsdb: implement FetchInFlightPayments for sql backend

sqldb/sqlc/querier.go

@@ -38,8 +38,9 @@ type Querier interface {
 	FailPayment(ctx context.Context, arg FailPaymentParams) (sql.Result, error)
 	FetchAMPSubInvoiceHTLCs(ctx context.Context, arg FetchAMPSubInvoiceHTLCsParams) ([]FetchAMPSubInvoiceHTLCsRow, error)
 	FetchAMPSubInvoices(ctx context.Context, arg FetchAMPSubInvoicesParams) ([]AmpSubInvoice, error)
-	// Fetch all inflight attempts across all payments
-	FetchAllInflightAttempts(ctx context.Context) ([]PaymentHtlcAttempt, error)
+	// Fetch all inflight attempts with their payment data using pagination.
+	// Returns attempt data joined with payment and intent data to avoid separate queries.
+	FetchAllInflightAttempts(ctx context.Context, arg FetchAllInflightAttemptsParams) ([]PaymentHtlcAttempt, error)
 	FetchHopLevelCustomRecords(ctx context.Context, hopIds []int64) ([]PaymentHopCustomRecord, error)
 	FetchHopsForAttempts(ctx context.Context, htlcAttemptIndices []int64) ([]FetchHopsForAttemptsRow, error)
 	// Batch query to fetch only HTLC resolution status for multiple payments.
@@ -49,6 +50,9 @@ type Querier interface {
 	FetchHtlcAttemptsForPayments(ctx context.Context, paymentIds []int64) ([]FetchHtlcAttemptsForPaymentsRow, error)
 	FetchPayment(ctx context.Context, paymentIdentifier []byte) (FetchPaymentRow, error)
 	FetchPaymentLevelFirstHopCustomRecords(ctx context.Context, paymentIds []int64) ([]PaymentFirstHopCustomRecord, error)
+	// Batch fetch payment and intent data for a set of payment IDs.
+	// Used to avoid fetching redundant payment data when processing multiple
+	// attempts for the same payment.
 	FetchPaymentsByIDs(ctx context.Context, paymentIds []int64) ([]FetchPaymentsByIDsRow, error)
 	// FetchPendingInvoices returns all invoices in a pending state (open or
 	// accepted). The invoices_state_idx index on the state column makes this a