Delete row sig_1357f6b34ead from signals

id sig_1357f6b34ead
event_id evt_53a7be417aed
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_ad1a92b07 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:29d ...
throttle_s 0
created_at 2026-04-12T13:46:53.258496+00:00
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