Delete row sig_a009a273549d from signals

id sig_a009a273549d
event_id evt_e8e402b1fb7b
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_c6a84f8fb ...
dedupe_key signal_enriched:discovery_ipo_delta:6c90f1dc47a4e6 ...
throttle_s 0
created_at 2026-04-17T00:43:39.064220+00:00
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