Delete row sig_e66ca603476d from signals

id sig_e66ca603476d
event_id evt_77e5aeabed02
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-17T09:44:53.485729+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:444f1320dc87223a
throttle_s 0
created_at 2026-04-17T09:44:53.485729+00:00
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