Delete row sig_a21f19d21a77 from signals

id sig_a21f19d21a77
event_id evt_d8ab206ce1b3
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_a2eb7be4c ...
dedupe_key signal_enriched:discovery_sector_rotation_delta:15 ...
throttle_s 0
created_at 2026-04-10T15:51:15.884890+00:00
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