Delete row sig_0419545eeb0e from signals

id sig_0419545eeb0e
event_id evt_6c04dd3dd41b
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_ec7711772 ...
dedupe_key signal_enriched:discovery_ipo_delta:dbfe764aaae02f ...
throttle_s 0
created_at 2026-04-22T14:13:37.135360+00:00
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