Delete row sig_dad88d277ab7 from signals

id sig_dad88d277ab7
event_id evt_48c2730521d0
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-21T09:16:05.409147+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:952bb08692c02e66
throttle_s 0
created_at 2026-04-21T09:16:05.409147+00:00
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