Delete row sig_19f55c547263 from signals

id sig_19f55c547263
event_id evt_3b49629c324a
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-15T11:17:39.657452+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:4d3dc41e85f96125
throttle_s 0
created_at 2026-04-15T11:17:39.657452+00:00
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