Deleting a panel node left its agent_nodes rows and probe.db rows
behind, so deleted nodes kept showing as ghosts and their probe
latency stayed attributed to leftover rows (TYYUN case). Delete now
removes agent rows bound by agent_nodes.node_id inside the existing
panel transaction, then drops each agent's probe rows (meta, traffic,
both history tiers, ping records and ping assignments) and the
public-page snapshot. Agents link by node_id, probe rows by agent row
id: matching probe rows on the node id would strike another node's
data (Oracle-JP: node 33, agent row 20).
Muse
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