Delete row sig_bcd86587f8f8 from signals

id sig_bcd86587f8f8
event_id evt_edb94a15de9a
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_563d536c3 ...
dedupe_key signal_enriched:discovery_ipo_delta:1c18b3fd730714 ...
throttle_s 0
created_at 2026-04-14T13:14:01.410660+00:00
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