Delete row sig_f2d8ead7af1d from signals

id sig_f2d8ead7af1d
event_id evt_9d29a38f5267
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_62c18101c ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:955 ...
throttle_s 0
created_at 2026-04-19T12:46:14.065812+00:00
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