[#1][WIFI-15157][OpenLAN CGW] Resolved shard ownership of infra on device connection

[nitin-ra]

Root cause:

• Each shard caches only its own details.
• When an AP (gateway) connects to a non-owner shard, that shard cannot determine whether the device is truly unassigned or owned by another shard.

Solution:

• On local cache miss, query Redis/DB for existing infra group.
• Resolve ownership: emit Kafka event (foreign/unassigned).
• Purge the device from all shard Redis caches to prevent stale entries.

Test:

• Build passes OK!.
• Verified no regression.

[jaspreetsachdev]

@i-chvets @acapparelli please take the PR and check.

[jaspreetsachdev]

@phwhite Is this PR within the design of this component?

[Cahb]

Hi @nitin-ra
The conceptual changes seem OK, apart from the

Purge the device from all shard Redis caches to prevent stale entries
As each CGW should maintain only local cache, it's part of the design core;

But i think here it's fine;

Apart from that, while CGW can function without the proxy application, i'd recommend investing some time into the proxy app that comes with this repo; The proxy is responsible as well for coordinating which or devices should connect where;

As for this PR in particular, i think we have to agree what to do next: Paul proposed to conduct a meeting (see Slack message);