Delete row sig_56955e33c848 from signals

id sig_56955e33c848
event_id evt_0a8685c8618b
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_4f2a7814f ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:9e4 ...
throttle_s 0
created_at 2026-04-14T20:20:10.540405+00:00
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