🗃 Remove visible when acking jobs

This is a non-breaking change that forms part of the migration path to
improving our performance in #15

When acking a job, we now unset the `visible` property, which makes
`visible` and `deleted` mutually exclusive properties, so that the
presence of one implies the absence of the other.

We can do this, because the only time we query on `visible` is when we
*also* query for `deleted: {$exists: false}`. Similarly, the only times
we query for `deleted: {$exists: true}` are times when we don't query
`visible`.

Author: alecgibson

mongodb-queue.ts

@@ -208,6 +208,9 @@ export class MongoDBQueue<T = any> {
       $set: {
         deleted: now(),
       },
+      $unset: {
+        visible: 1,
+      },
     };
     const options = {
       returnDocument: 'after',

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@reedsy/mongodb-queue",
-  "version": "7.1.0",
+  "version": "7.1.1",
   "description": "Message queues which uses MongoDB.",
   "main": "mongodb-queue.js",
   "scripts": {