Anso a7e856f447 feat: enforce singleton local node per instance (#1567) ...

Only one local node is allowed. Creating a second local returns 409,
and the last local node cannot be deleted or converted to a remote type.
Existing duplicate local nodes from older versions are preserved and can
be cleaned up individually. Zero-local recovery auto-assigns the default
flag. Frontend delete surfaces and the Add Node form respect the new
invariant.

Enforced in DatabaseService (addNode/updateNode/deleteNode guards) and
routes (error translations). Legacy test fixtures use raw SQL helpers.

2026-07-05 05:30:56 -04:00

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