Delete row sig_a75d0b6b7d7e from signals

id sig_a75d0b6b7d7e
event_id evt_f9fa6d5d39ba
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_78835fe8a ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:92e ...
throttle_s 0
created_at 2026-04-22T14:13:37.135360+00:00
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