Delete row sig_87bc282360f3 from signals

id sig_87bc282360f3
event_id evt_cc51d50ad841
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_ab2cb83b8 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:05f ...
throttle_s 0
created_at 2026-04-09T00:13:45.001978+00:00
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