Delete row sig_b5ddb02d6a47 from signals

id sig_b5ddb02d6a47
event_id evt_bb40c1a68607
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_45b5dade1 ...
dedupe_key signal_enriched:discovery_ipo_delta:d2f188aa5a5a7f ...
throttle_s 0
created_at 2026-04-08T08:32:19.428540+00:00
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