Delete row sig_b67226f44efc from signals

id sig_b67226f44efc
event_id evt_bd59d6bd8d69
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_865e8be21 ...
dedupe_key signal_enriched:discovery_ipo_delta:30b696e7250f93 ...
throttle_s 0
created_at 2026-04-11T00:11:50.548611+00:00
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