Delete row sig_554c27405a90 from signals

id sig_554c27405a90
event_id evt_9f133baa6cc4
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_0ba5d1630 ...
dedupe_key signal_enriched:discovery_ipo_delta:4e146d99280554 ...
throttle_s 0
created_at 2026-04-22T08:07:13.237740+00:00
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