Delete row sig_ef27418b845f from signals

id sig_ef27418b845f
event_id evt_49d15696246c
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_a46e4c113 ...
dedupe_key signal_enriched:discovery_ipo_delta:09cff911cb54a5 ...
throttle_s 0
created_at 2026-04-18T21:48:05.088544+00:00
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