MongoDB appName & MySQL program_name

[rkistner]

This includes an identifying name in database connections, which helps to distinguish database connections made by powersync from other sources.

• MongoDB source database (direct connection and change stream): 'powersync' as appName.
• MongoDB storage database: 'powersync-storage' as appName.
• MySQL direct connection: 'powersync' as program_name.
• MySQL replication connection: Not supported by Zongji yet.
• Postgres connections (all): 'PowerSync' (already present before this PR)

For MongoDB, this is present in db.currentOp(), as well as in logs:

// currentOp:
       client: '127.0.0.1:40558',
      appName: 'powersync',
      clientMetadata: {
        application: { name: 'powersync' },
        driver: { name: 'nodejs', version: '6.14.2' },
        platform: 'Node.js v22.14.0, LE',
        os: {
          name: 'linux',
          architecture: 'x64',
          version: '6.15.0-061500-generic',
          type: 'Linux'
        }
      }

// logs:
{"application":{"name":"powersync"},"driver":{"name":"nodejs","version":"6.14.2"}, ...

In MySQL, this can be accessed via select * from performance_schema.session_connect_attrs;:

+----------------+-----------------+--------------+------------------+
| PROCESSLIST_ID | ATTR_NAME       | ATTR_VALUE   | ORDINAL_POSITION |
|             18 | _client_name    | Node-MySQL-2 |                0 |
|             18 | _client_version | 3.11.3       |                1 |
|             18 | program_name    | powersync    |                2 |
+----------------+-----------------+--------------+------------------+

In Postgres, use select usename, client_addr, application_name, backend_type from pg_stat_activity;:

| usename  | client_addr                          | application_name              | backend_type   |
| -------- | ------------------------------------ | ----------------------------- | -------------- |
| postgres | 54.195.180.72                        | PowerSync                     | walsender      |

[changeset-bot]

🦋 Changeset detected

Latest commit: 09f60c8

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

This PR includes changesets to release 12 packages

Name	Type
@powersync/service-module-mongodb-storage	Patch
@powersync/service-module-mongodb	Patch
@powersync/service-module-mysql	Patch
@powersync/lib-service-mongodb	Patch
@powersync/service-core	Patch
@powersync/service-image	Patch
@powersync/service-schema	Patch
@powersync/service-module-postgres	Patch
@powersync/service-core-tests	Patch
@powersync/service-module-core	Patch
@powersync/service-module-postgres-storage	Patch
test-client	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[stevensJourney]

LGTM