Delete row sig_49456188f69d from signals

id sig_49456188f69d
event_id evt_10ddd5a9352e
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-09T07:40:05.414752+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:b24e5588671ac5e3
throttle_s 0
created_at 2026-04-09T07:40:05.414752+00:00
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