MongoDB Alpha Support

[rkistner]

Alpha MongoDB replication module. Loosely based on the Postgres module.

Replication is performed using MongoDB change streams, rather than the low-level oplog API, to make sure we get proper documents out instead of the low-level operations. The clusterTime (oplog timestamp) is used in place of postgres LSN.

Replication currently uses the fullDocument: 'updateLookup' option, which means that operations could replicate out of order. This will be fixed in a future release.

Sample config:

# powersync.yaml
replication:
  connections:
    - type: mongodb
      uri: mongodb://127.0.0.1:27017/powersync_demodb

# sync-rules.yaml
bucket_definitions:
  global:
    data:
      - select _id as id, * from lists
      - select _id as id, * from todos

Demo backend: https://github.com/powersync-ja/powersync-nodejs-backend-todolist-demo
Demo app: https://github.com/powersync-ja/self-host-demo/tree/main/demos/nodejs/demo-app (no changes from the Postgres version)

[changeset-bot]

🦋 Changeset detected

Latest commit: 5050204

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@powersync/service-module-mongodb	Minor
@powersync/service-image	Minor

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