Delete row sig_7fa577c1c2c5 from signals

id sig_7fa577c1c2c5
event_id evt_8aa71bff3fa3
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_27f457cee ...
dedupe_key signal_enriched:news_delta:7d1dec2675afc049
throttle_s 0
created_at 2026-04-07T23:23:39.231593+00:00
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