Delete row sig_1558c2b899ad from signals

id sig_1558c2b899ad
event_id evt_a05d66adbaf6
watcher_id NULL
signal_type discovery_unusual_volume_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_7e0c2fe0c ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:661 ...
throttle_s 0
created_at 2026-04-15T17:34:08.882390+00:00
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