Delete row sig_9fe4d415f98e from signals

id sig_9fe4d415f98e
event_id evt_71c203378c28
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-12T14:47:21.648486+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:ad34e0f802b4bc6 ...
throttle_s 0
created_at 2026-04-12T14:47:21.648486+00:00
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