Delete row sig_8404ba86f27d from signals

id sig_8404ba86f27d
event_id evt_6928c6165e51
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_cf9744032 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:0b0 ...
throttle_s 0
created_at 2026-04-09T01:43:26.310695+00:00
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