Delete row sig_d794c74d9541 from signals

id sig_d794c74d9541
event_id evt_d9fe48081efd
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_90eea315d ...
dedupe_key signal_enriched:discovery_ipo_delta:ab68dac760e41d ...
throttle_s 0
created_at 2026-04-08T19:57:42.365437+00:00
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