Delete row sig_fbbbcf61753e from signals

id sig_fbbbcf61753e
event_id evt_bea79f6df4b0
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_c6be239c0 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:d69 ...
throttle_s 0
created_at 2026-04-13T10:26:04.867531+00:00
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