Delete row sig_147c0ead0edd from signals

id sig_147c0ead0edd
event_id evt_22fb164ae6d0
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_4df344a45 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:122 ...
throttle_s 0
created_at 2026-04-18T14:14:09.415921+00:00
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