Delete row sig_899ccc4a83a9 from signals

id sig_899ccc4a83a9
event_id evt_748fbff513f8
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-03T18:42:30.758500+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:e68a47c81ef3d93 ...
throttle_s 0
created_at 2026-04-03T18:42:30.758500+00:00
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