Delete row sig_1d8fa9962266 from signals

id sig_1d8fa9962266
event_id evt_90eb120c0efa
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_0b6d64e67 ...
dedupe_key signal_enriched:discovery_ipo_delta:c60ed5838cb4e7 ...
throttle_s 0
created_at 2026-04-09T09:09:23.106819+00:00
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