Delete row sig_49823feeafba from signals

id sig_49823feeafba
event_id evt_6056d0efbad5
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-21T18:18:22.267366+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:296a7bfe4359ce41
throttle_s 0
created_at 2026-04-21T18:18:22.267366+00:00
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