Delete row sig_e4b20a4feb56 from signals

id sig_e4b20a4feb56
event_id evt_fb2fe3f4a95f
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_90e58c242 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:c0c ...
throttle_s 0
created_at 2026-04-17T11:14:13.026874+00:00
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