Delete row sig_953e75ffdad6 from signals

id sig_953e75ffdad6
event_id evt_ee77f20afd79
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_3dd5ddc93 ...
dedupe_key signal_enriched:news_delta:93aa8f660f01823c
throttle_s 0
created_at 2026-04-17T02:05:53.524734+00:00
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