Delete row sig_b8fd5ee7fbbc from signals

id sig_b8fd5ee7fbbc
event_id evt_c1e24f70878b
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_e6726eda7 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:44f ...
throttle_s 0
created_at 2026-04-11T15:08:00.060011+00:00
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