Delete row sig_31676e790ede from signals

id sig_31676e790ede
event_id evt_5acb87069b40
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-20T18:44:57.232675+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:c3ac9dc0355de75b
throttle_s 0
created_at 2026-04-20T18:44:57.232675+00:00
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