Delete row sig_a53a8c5156ae from signals

id sig_a53a8c5156ae
event_id evt_b7e71d23d1a6
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_f38061c29 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:794 ...
throttle_s 0
created_at 2026-04-14T09:10:46.756430+00:00
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