Delete row sig_ba139c01cca8 from signals

id sig_ba139c01cca8
event_id evt_ff78d14f42b9
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_e4ac38cae ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:f58 ...
throttle_s 0
created_at 2026-04-14T10:11:17.846354+00:00
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