sqldb+invoices: add migration to fix incorrectly stored invoice expiries

Previously, when using the native schema, invoice expiries were incorrectly
stored as 64-bit values (expiry in nanoseconds instead of seconds), causing
overflow issues. Since we cannot determine the original values, we will set
the expiries for existing invoices to 1 hour with this migration.

invoices/invoices_test.go

@@ -69,7 +69,7 @@ func randInvoice(value lnwire.MilliSatoshi) (*invpkg.Invoice, error) {
 	i := &invpkg.Invoice{
 		CreationDate: testNow,
 		Terms: invpkg.ContractTerm{
-			Expiry:          4000,
+			Expiry:          time.Duration(4000) * time.Second,
 			PaymentPreimage: &pre,
 			PaymentAddr:     payAddr,
 			Value:           value,

invoices/sql_store.go

@@ -233,7 +233,7 @@ func (i *SQLStore) AddInvoice(ctx context.Context,
 			CltvDelta: sqldb.SQLInt32(
 				newInvoice.Terms.FinalCltvDelta,
 			),
-			Expiry: int32(newInvoice.Terms.Expiry),
+			Expiry: int32(newInvoice.Terms.Expiry.Seconds()),
 			// Note: keysend invoices don't have a payment request.
 			PaymentRequest: sqldb.SQLStr(string(
 				newInvoice.PaymentRequest),
@@ -1598,6 +1598,8 @@ func unmarshalInvoice(row sqlc.Invoice) (*lntypes.Hash, *Invoice,
 		cltvDelta = row.CltvDelta.Int32
 	}
 
+	expiry := time.Duration(row.Expiry) * time.Second
+
 	invoice := &Invoice{
 		SettleIndex:    uint64(settleIndex),
 		SettleDate:     settledAt,
@@ -1606,7 +1608,7 @@ func unmarshalInvoice(row sqlc.Invoice) (*lntypes.Hash, *Invoice,
 		CreationDate:   row.CreatedAt.Local(),
 		Terms: ContractTerm{
 			FinalCltvDelta:  cltvDelta,
-			Expiry:          time.Duration(row.Expiry),
+			Expiry:          expiry,
 			PaymentPreimage: preimage,
 			Value:           lnwire.MilliSatoshi(row.AmountMsat),
 			PaymentAddr:     paymentAddr,

sqldb/sqlc/migrations/000004_invoice_expiry_fix.down.sql

@@ -0,0 +1,2 @@
+-- Given that all expiries are changed in this migration we won't be able to
+-- roll back to the previous values.

sqldb/sqlc/migrations/000004_invoice_expiry_fix.up.sql

@@ -0,0 +1,5 @@
+-- Update the expiry to 86400 seconds (24 hours) for all records in the
+-- invoices table. This is needed as previously we stored raw time.Duration
+-- values which are 64 bit integers and are used to express duration in
+-- nanoseconds however the intent is to store invoice expiry in seconds.
+UPDATE invoices SET expiry = 86400;