Delete row sig_0330b70d16f2 from signals

id sig_0330b70d16f2
event_id evt_e04ecbc864b7
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_258698209 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:1f1 ...
throttle_s 0
created_at 2026-04-06T12:11:16.372821+00:00
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