Delete row sig_c970649e953d from signals

id sig_c970649e953d
event_id evt_f9b85d5d3bad
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_03d63065b ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:fb4 ...
throttle_s 0
created_at 2026-04-12T00:38:28.481951+00:00
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