Delete row sig_9b4054393ed3 from signals

id sig_9b4054393ed3
event_id evt_d55adb7e90df
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_9bf99344b ...
dedupe_key signal_enriched:discovery_ipo_delta:1a4a31c61b6c71 ...
throttle_s 0
created_at 2026-04-10T22:42:10.560858+00:00
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