Delete row sig_1b2c90f7c0a8 from signals

id sig_1b2c90f7c0a8
event_id evt_230d14fe81d7
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_1cd0d7cee ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:131 ...
throttle_s 0
created_at 2026-04-16T13:18:26.594311+00:00
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