Delete row sig_647c49cdf812 from signals

id sig_647c49cdf812
event_id evt_73dc537a04a1
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-09T19:34:12.194291+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:c6f641dffff8777 ...
throttle_s 0
created_at 2026-04-09T19:34:12.194291+00:00
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