Delete row sig_97c1992020ad from signals

id sig_97c1992020ad
event_id evt_36b553b29d3b
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-11T15:08:00.056576+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:42f8c3c79566593f
throttle_s 0
created_at 2026-04-11T15:08:00.056576+00:00
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