Delete row sig_b1c62f3b8ddb from signals

id sig_b1c62f3b8ddb
event_id evt_4fed67395d84
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_7eca175cd ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:0ce ...
throttle_s 0
created_at 2026-04-15T20:32:53.088373+00:00
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