sqldb: ensure schema definitions are fully SQLite compatible

Previously, we applied replacements to our schema definitions
to make them compatible with both SQLite and Postgres backends,
as the files were not fully compatible with either.

With this change, the only replacement required for SQLite has
been moved to the generator script. This adjustment ensures
compatibility by enabling auto-incrementing primary keys that
are treated as 64-bit integers by sqlc.

sqldb/sqlc/invoices.sql.go

@@ -591,7 +591,7 @@ INSERT INTO invoice_payment_hashes (
 `
 
 type InsertKVInvoiceKeyAndAddIndexParams struct {
-	ID       int32
+	ID       int64
 	AddIndex int64
 }
 
@@ -675,7 +675,7 @@ WHERE id = $1
 `
 
 type SetKVInvoicePaymentHashParams struct {
-	ID   int32
+	ID   int64
 	Hash []byte
 }