Delete row sig_1da5ab78a2a9 from signals

id sig_1da5ab78a2a9
event_id evt_0b262480f86d
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_f8669e827 ...
dedupe_key signal_enriched:discovery_ipo_delta:de54c459cbd11f ...
throttle_s 0
created_at 2026-04-20T10:08:18.324557+00:00
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