Delete row sig_5d97b1ba19d5 from signals

id sig_5d97b1ba19d5
event_id evt_255c88ef3fd8
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-07T17:22:31.646713+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:336c70c9680a6e4 ...
throttle_s 0
created_at 2026-04-07T17:22:31.646713+00:00
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