Delete row sig_4b8e5536d973 from signals

id sig_4b8e5536d973
event_id evt_5f6c0a873bdd
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_a37d6fd0a ...
dedupe_key signal_enriched:discovery_ipo_delta:47f3f8d2bd80db ...
throttle_s 0
created_at 2026-04-17T14:13:05.509159+00:00
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