Delete row sig_a609991d2e37 from signals

id sig_a609991d2e37
event_id evt_f17e21d234ff
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-19T11:16:24.658368+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:b455f9b3c4e55d0 ...
throttle_s 0
created_at 2026-04-19T11:16:24.658368+00:00
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