Delete row sig_4ffb6b4b8fc4 from signals

id sig_4ffb6b4b8fc4
event_id evt_6f4ae444dccc
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_b8f4dd2c0 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:67c ...
throttle_s 0
created_at 2026-04-22T02:02:59.137029+00:00
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