Delete row sig_16abbdd9dd88 from signals

id sig_16abbdd9dd88
event_id evt_eebade2417b3
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-19T20:14:07.003000+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:f615da196643766e
throttle_s 0
created_at 2026-04-19T20:14:07.003000+00:00
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