Delete row sig_ddf31ac89e21 from signals

id sig_ddf31ac89e21
event_id evt_df011384b4e4
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_52604665d ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:606 ...
throttle_s 0
created_at 2026-04-22T04:05:03.223061+00:00
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