Delete row sig_1c7f10fce30b from signals

id sig_1c7f10fce30b
event_id evt_fba34a2e1307
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_22b986cb3 ...
dedupe_key signal_enriched:news_delta:4c2df4f70165a02c
throttle_s 0
created_at 2026-04-09T22:47:29.344861+00:00
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