Delete row sig_2283d557e9be from signals

id sig_2283d557e9be
event_id evt_775b66b5e48c
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_e4315406a ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:149 ...
throttle_s 0
created_at 2026-04-22T14:13:37.135360+00:00
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