Delete row sig_2fe4787f0430 from signals

id sig_2fe4787f0430
event_id evt_a3fa6d8eb9b5
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_036c33ba1 ...
dedupe_key signal_enriched:discovery_ipo_delta:8acd7e50cf2798 ...
throttle_s 0
created_at 2026-04-10T17:21:18.772571+00:00
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