Delete row sig_b8ce10597c99 from signals

id sig_b8ce10597c99
event_id evt_e2d12334516f
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-19T02:17:29.219563+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:dc4e4fb6595ae74 ...
throttle_s 0
created_at 2026-04-19T02:17:29.219563+00:00
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