Delete row sig_2c998c5be414 from signals

id sig_2c998c5be414
event_id evt_cf637f90488c
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-19T22:59:40.646664+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:6231e36b614889e ...
throttle_s 0
created_at 2026-04-19T22:59:40.646664+00:00
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