Delete row sig_14480192556d from signals

id sig_14480192556d
event_id evt_722ffbee4591
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_3acd5ef27 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:a6b ...
throttle_s 0
created_at 2026-04-20T17:15:12.787981+00:00
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