Delete row sig_1941c09fa7bd from signals

id sig_1941c09fa7bd
event_id evt_08d3853ba280
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-12T13:46:53.258055+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:540e5aa0ac008f6 ...
throttle_s 0
created_at 2026-04-12T13:46:53.258055+00:00
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