Delete row sig_fb226e0f2476 from signals

id sig_fb226e0f2476
event_id evt_26bfebd6ffff
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_85592ba22 ...
dedupe_key signal_enriched:news_delta:15175bdd78c28172
throttle_s 0
created_at 2026-04-18T15:11:39.818056+00:00
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