Delete row sig_9caa72da470d from signals

id sig_9caa72da470d
event_id evt_ea8ba12bd245
watcher_id NULL
signal_type discovery_ipo_snapshot
value {"as_of":"2026-04-13T10:26:04.866132+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_ipo_snapshot:b711efb0f44b67ae
throttle_s 0
created_at 2026-04-13T10:26:04.866132+00:00
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