Delete row sig_f2b5ad381b61 from signals

id sig_f2b5ad381b61
event_id evt_ed7fbeafc8c6
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-11T23:37:47.298953+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:4989d61d7bf2352 ...
throttle_s 0
created_at 2026-04-11T23:37:47.298953+00:00
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