Delete row sig_efffc26f7462 from signals

id sig_efffc26f7462
event_id evt_fa46ce8c5d02
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-08T05:30:32.351815+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:1a096f7dd9000c6 ...
throttle_s 0
created_at 2026-04-08T05:30:32.351815+00:00
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