Delete row sig_6f1056e05db1 from signals

id sig_6f1056e05db1
event_id evt_bdd3acbfbbff
watcher_id NULL
signal_type discovery_new_listings_snapshot
value {"as_of":"2026-04-16T15:51:11.058405+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_new_listings_snapshot:2b8e2a8a2859ce1b
throttle_s 0
created_at 2026-04-16T15:51:11.058405+00:00
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