Delete row sig_aec94156e985 from signals

id sig_aec94156e985
event_id evt_f888a66e3353
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_ae1cf6b0c ...
dedupe_key signal_enriched:discovery_ipo_delta:60d90c2f52af90 ...
throttle_s 0
created_at 2026-04-09T16:35:58.987693+00:00
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