Delete row sig_aa928fc54333 from signals

id sig_aa928fc54333
event_id evt_8c970031d777
watcher_id NULL
signal_type discovery_unusual_volume_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_64f935846 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:1c6 ...
throttle_s 0
created_at 2026-04-16T18:53:43.260650+00:00
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