Database
[{"_id":ObjectId("616acc597ebda90ca6ffee21"),"username":"test@test.com","displayName":"Test","devices":[{"serial":"865674036421275","data":[{"timestamp":"2021-10-16T12:36:35.799Z"},{"timestamp":"2021-10-16T12:41:33.633Z"},{"timestamp":"2021-10-16T12:52:03.055Z"}]},],"hashedPassword":"R5vt3vY7vEvTHvhC7YGNOWuIjBUQGLqsd92QGE06tjU=","salt":"6RS0OVIFboCkIEPHdZmTcQ==","dateCreated":"2021-10-16T12:58:00.294Z"}]
Query
db.collection.update({"_id":ObjectId("616acc597ebda90ca6ffee21"),"devices.serial":{"$ne":"000"}},{"$push":{"devices":{"serial":"000","data":[]}}})