Delete row sig_c16bbf31e908 from signals

id sig_c16bbf31e908
event_id evt_8acd9e7fdd9e
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_9b30727ec ...
dedupe_key signal_enriched:news_delta:ce8ff18ac08974ea
throttle_s 0
created_at 2026-04-20T12:01:18.737786+00:00
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