Delete row sig_9a28dfbad7d3 from signals

id sig_9a28dfbad7d3
event_id evt_0b164f09b096
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-20T13:10:00.943306+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:740a7ee1e35f6cb ...
throttle_s 0
created_at 2026-04-20T13:10:00.943306+00:00
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