Delete row sig_abc95733f76d from signals

id sig_abc95733f76d
event_id evt_3084433e3ce1
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_80747e771 ...
dedupe_key signal_enriched:discovery_ipo_delta:5b30619bbaf165 ...
throttle_s 0
created_at 2026-04-09T01:43:26.310695+00:00
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