DiagramControllerIT.postDiagram_dataAppearsAfterFlush now verifies via
GET /api/v1/environments/{env}/apps/{app}/routes/{route}/diagram instead
of a PG SELECT against the ClickHouse route_diagrams table.
DiagramRenderControllerIT seeds both a diagram and an execution on the
same route, then reads the stamped diagramContentHash off the execution-
detail REST response to drive the flat /api/v1/diagrams/{hash}/render
tests. The env-scoped endpoint only serves JSON, so SVG tests still hit
the content-hash endpoint — but the hash comes from REST now, not SQL.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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