Delete row sig_775d25b6365c from signals

id sig_775d25b6365c
event_id evt_c5e909589095
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_f31b01c06 ...
dedupe_key signal_enriched:news_delta:dfa6257a3c1103c6
throttle_s 0
created_at 2026-04-21T19:56:17.256249+00:00
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