Delete row sig_4e904b257c33 from signals

id sig_4e904b257c33
event_id evt_b428f22a6b29
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_20a35e9f7 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:54b ...
throttle_s 0
created_at 2026-04-21T13:49:56.265209+00:00
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