Delete row sig_215df0e90d3d from signals

id sig_215df0e90d3d
event_id evt_6cac129c52ef
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_173081dad ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:a3f ...
throttle_s 0
created_at 2026-04-19T11:16:24.661615+00:00
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