Delete row sig_5a28f669221e from signals

id sig_5a28f669221e
event_id evt_0d895cd6afad
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_091b10959 ...
dedupe_key signal_enriched:news_delta:1178ab00f2496788
throttle_s 0
created_at 2026-04-13T11:10:14.165917+00:00
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