Delete row sig_a767bad124de from signals

id sig_a767bad124de
event_id evt_3e892494249b
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_20dfc5209 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:8c9 ...
throttle_s 0
created_at 2026-04-12T11:45:34.865983+00:00
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