Delete row sig_2fc42b5b2a5f from signals

id sig_2fc42b5b2a5f
event_id evt_53c1c6aa4f70
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_df1b01026 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:1a0 ...
throttle_s 0
created_at 2026-04-06T18:42:37.816572+00:00
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