Delete row sig_f93c1804c04d from signals

id sig_f93c1804c04d
event_id evt_bd145a7a89ce
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_e9d01cf42 ...
dedupe_key signal_enriched:news_delta:454dd5692a940509
throttle_s 0
created_at 2026-04-18T12:03:56.334824+00:00
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