req.Params.RelType is *[]string; passing the nil pointer straight
through as a pgx query arg (both in the blast_radius() call and in
ListGraphEdges) panics because pgx can't infer the array element type
from a nil *[]string, only from a concrete (possibly nil) []string.
Dereference once up front instead. Also affected the sqlc-based
ListGraphEdges path added by the R3 refactor, which had the same bug.
Add a regression test for GET /api/v1/graph?root=X&depth=N with no
rel_type.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
dtoro
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