Delete row sig_15269984d42e from signals

id sig_15269984d42e
event_id evt_22337796029f
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-19T03:47:18.530626+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:733d385ea264c6b9
throttle_s 0
created_at 2026-04-19T03:47:18.530626+00:00
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