Delete row sig_6498a914eec2 from signals

id sig_6498a914eec2
event_id evt_bedf2e12935d
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_7698f6f1b ...
dedupe_key signal_enriched:discovery_ipo_delta:77cb5a7c2b6860 ...
throttle_s 0
created_at 2026-04-20T11:08:48.396890+00:00
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