Delete row sig_ff5d1b080ff1 from signals

id sig_ff5d1b080ff1
event_id evt_4d33d39a99f1
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_61e764507 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:b39 ...
throttle_s 0
created_at 2026-04-09T01:43:26.310695+00:00
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