Delete row sig_90ca31739c19 from signals

id sig_90ca31739c19
event_id evt_b9316bf0303f
watcher_id NULL
signal_type discovery_sector_rotation_snapshot
value {"as_of":"2026-04-07T08:23:37.870744+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_sector_rotation_snapshot:c075dbf9353a4c5 ...
throttle_s 0
created_at 2026-04-07T08:23:37.870744+00:00
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