Delete row sig_0d7080758f79 from signals

id sig_0d7080758f79
event_id evt_8f67e6dd64c1
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_5a12a81db ...
dedupe_key signal_enriched:discovery_ipo_delta:19d86910fe780b ...
throttle_s 0
created_at 2026-04-18T15:49:14.474663+00:00
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