Delete row sig_4ccec4d457cc from signals

id sig_4ccec4d457cc
event_id evt_a2f540e85a02
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_3ecf4eb74 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:6c9 ...
throttle_s 0
created_at 2026-04-14T13:14:01.410660+00:00
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