Delete row sig_f1973ec52375 from signals

id sig_f1973ec52375
event_id evt_5e063663bcbf
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_da90e7958 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:f24 ...
throttle_s 0
created_at 2026-04-19T17:15:33.112665+00:00
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