Delete row sig_a1bb403f099e from signals

id sig_a1bb403f099e
event_id evt_7a4847673d91
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-21T10:45:03.230503+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:e98700cdab2b29e ...
throttle_s 0
created_at 2026-04-21T10:45:03.230503+00:00
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