Delete row sig_4f965b8e5aa1 from signals

id sig_4f965b8e5aa1
event_id evt_d01328e94ff0
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-12T08:43:49.623249+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:47d1f011ffa7045 ...
throttle_s 0
created_at 2026-04-12T08:43:49.623249+00:00
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