Delete row sig_a1c2e93bee43 from signals

id sig_a1c2e93bee43
event_id evt_487d6691597a
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_6cba56edf ...
dedupe_key signal_enriched:discovery_ipo_delta:01d100b4bf4441 ...
throttle_s 0
created_at 2026-04-09T09:09:23.106819+00:00
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