Delete row sig_dd67a9d4e6a3 from signals

id sig_dd67a9d4e6a3
event_id evt_72e6cc63b636
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_577b361ae ...
dedupe_key signal_enriched:discovery_ipo_delta:cdd3d105d44903 ...
throttle_s 0
created_at 2026-04-09T18:05:02.959642+00:00
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