Delete row sig_72c6405b5888 from signals

id sig_72c6405b5888
event_id evt_8d590e5f3a81
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_52831b98c ...
dedupe_key signal_enriched:discovery_ipo_delta:730197e6fcf727 ...
throttle_s 0
created_at 2026-04-07T23:23:54.391414+00:00
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