Delete row sig_ab23cf9c48cc from signals

id sig_ab23cf9c48cc
event_id evt_e7f58a3fcbf2
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_026d0d4a7 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:6f9 ...
throttle_s 0
created_at 2026-04-06T21:04:57.701497+00:00
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