Delete row sig_988911855641 from signals

id sig_988911855641
event_id evt_869c3abc168a
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-19T17:15:33.112237+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:fe7a8e790488b7ff
throttle_s 0
created_at 2026-04-19T17:15:33.112237+00:00
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