Delete row sig_b340e94b2a78 from signals

id sig_b340e94b2a78
event_id evt_1d89a5e91d49
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_2658acabe ...
dedupe_key signal_enriched:discovery_ipo_delta:0f88487e0837b3 ...
throttle_s 0
created_at 2026-04-08T06:31:07.641041+00:00
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