Delete row sig_4b0001857094 from signals

id sig_4b0001857094
event_id evt_025e9c3a8dee
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_99ba53db5 ...
dedupe_key signal_enriched:discovery_ipo_delta:40a56976c3a9cd ...
throttle_s 0
created_at 2026-04-20T12:09:20.977224+00:00
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