Delete row sig_e567a9751e74 from signals

id sig_e567a9751e74
event_id evt_bdef06d2de28
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_77086ba78 ...
dedupe_key signal_enriched:discovery_ipo_delta:4c108fd19b9660 ...
throttle_s 0
created_at 2026-04-08T21:48:34.772061+00:00
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