Delete row sig_78e273504f71 from signals

id sig_78e273504f71
event_id evt_f176a60f1710
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-19T18:44:42.561432+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:c05944c912032f6 ...
throttle_s 0
created_at 2026-04-19T18:44:42.561432+00:00
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