improved ledger account discovery

api/fx/storage/mongo/store/quotes.go

@@ -32,6 +32,17 @@ func NewQuotes(logger mlogger.Logger, db *mongo.Database, txFactory transaction.
 			},
 			Unique: true,
 		},
+		{
+			Keys: []ri.Key{
+				{Field: "meta.organizationRef", Sort: ri.Asc},
+				{Field: "meta.idempotencyKey", Sort: ri.Asc},
+			},
+			Unique: true,
+			Name:   "quotes_meta_org_idempotency_key",
+			PartialFilter: repository.Query().
+				Comparison(repository.Field("meta.idempotencyKey"), builder.Ne, "").
+				Comparison(repository.Field("meta.organizationRef"), builder.Exists, true),
+		},
 		{
 			Keys: []ri.Key{
 				{Field: "status", Sort: ri.Asc},