Delete row sig_9c4f6e6121d3 from signals

id sig_9c4f6e6121d3
event_id evt_a2c4dac530d0
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_bd2747805 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:253 ...
throttle_s 0
created_at 2026-04-11T13:38:22.073620+00:00
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