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rcourtman
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A tenant monitor's loop only sees its cancelled context after startMockMetricsSampler returns, and seeding the 50-node demo estate took 4-11s on CI runners (about 2.7s on an M-series Mac). Organization deletion cancels the loop and waits for it, so in mock mode every deletion of a just-used organization was held for the whole seed, and under the 2s budget #2518 introduced it was refused with tenant_shutdown_incomplete (Core E2E 13-api-token-scope since 15:03 UTC on 2026-10-05). Seeding now checks the context before each resource and returns ctx.Err() once cancelled, so the loop exits within a millisecond of the cancel. Series already sampled are recorded whole. A cancelled seed is never stored as the shared template other tenants reuse, and a monitor cancelled while it waited on the template lock returns without seeding. startMockMetricsSampler then skips the chart-cache warm-up and the sampler goroutine. #2529 separately gives deletion a longer bounded wait for any slow loop; this removes the mock-mode cause of the wait. Contract-Neutral: Mock-mode seeding stops early on monitor cancellation; no route, field, schema, persistence format or provider behaviour changes.