Delete row sig_ca9de7dc1b8a from signals

id sig_ca9de7dc1b8a
event_id evt_d89bd9964f39
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_988f93106 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:a5f ...
throttle_s 0
created_at 2026-04-20T10:08:18.324557+00:00
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