Delete row sig_c2f9e5b168d9 from signals

id sig_c2f9e5b168d9
event_id evt_a971fda91575
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-20T22:38:30.833857+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:881c8a08544f900f
throttle_s 0
created_at 2026-04-20T22:38:30.833857+00:00
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