Delete row sig_42b9cd885b2c from signals

id sig_42b9cd885b2c
event_id evt_f6f76b2f2376
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_d4bd5ee03 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:d1c ...
throttle_s 0
created_at 2026-04-12T07:43:09.975231+00:00
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