Delete row sig_88f920696126 from signals

id sig_88f920696126
event_id evt_a9f92371a308
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_dbea1120c ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:376 ...
throttle_s 0
created_at 2026-04-08T11:34:02.408899+00:00
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