Delete row sig_64adb14171a7 from signals

id sig_64adb14171a7
event_id evt_1fa4f6b4656d
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_c36f5bba8 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:498 ...
throttle_s 0
created_at 2026-04-08T10:33:26.208520+00:00
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