Delete row sig_28ea22460d2b from signals

id sig_28ea22460d2b
event_id evt_5602a76fc343
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_1eaa53c7e ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:daf ...
throttle_s 0
created_at 2026-04-07T00:26:16.032466+00:00
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