Delete row sig_a6a5e4f3d17a from signals

id sig_a6a5e4f3d17a
event_id evt_3780aa9d352b
watcher_id NULL
signal_type discovery_sector_rotation_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_889b07a48 ...
dedupe_key signal_enriched:discovery_sector_rotation_delta:55 ...
throttle_s 0
created_at 2026-04-09T22:59:43.472613+00:00
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