Delete row sig_900e4c559754 from signals

id sig_900e4c559754
event_id evt_7caad8437092
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_c151c9145 ...
dedupe_key signal_enriched:news_delta:4f97bd7f1e54ffbf
throttle_s 0
created_at 2026-04-19T17:09:55.311231+00:00
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