Delete row sig_48f4b5e4171a from signals

id sig_48f4b5e4171a
event_id evt_0dd6e9736de9
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_77cd358da ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:57e ...
throttle_s 0
created_at 2026-04-18T21:48:05.088544+00:00
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