Delete row sig_27b8190af06a from signals

id sig_27b8190af06a
event_id evt_f2cdbec2a742
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_3bbb4a054 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:3e2 ...
throttle_s 0
created_at 2026-04-20T10:08:18.324557+00:00
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