Delete row sig_446ab5640d68 from signals

id sig_446ab5640d68
event_id evt_53f26c24fbc7
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_13da35f48 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:9c1 ...
throttle_s 0
created_at 2026-04-14T21:50:00.113245+00:00
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