Delete row sig_d498c686f328 from signals

id sig_d498c686f328
event_id evt_c7734d38d0df
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_4fab14364 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:cd0 ...
throttle_s 0
created_at 2026-04-07T00:26:16.032466+00:00
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