Delete row sig_b99ec7a2810e from signals

id sig_b99ec7a2810e
event_id evt_ff72be4cd73b
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_2c767f706 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:185 ...
throttle_s 0
created_at 2026-04-20T01:00:47.909969+00:00
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