Delete row sig_a9896bd1a927 from signals

id sig_a9896bd1a927
event_id evt_d4e7972ecf23
watcher_id NULL
signal_type discovery_unusual_volume_delta
value {"aggregator_url":"https://www.nasdaq. ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_16b9db84f ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:d3c ...
throttle_s 0
created_at 2026-04-09T06:10:57.996436+00:00
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