Delete row sig_63094ea3ddda from signals

id sig_63094ea3ddda
event_id evt_078f420bf274
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_e5a543a3f ...
dedupe_key signal_enriched:news_delta:d0c2a1f3961a0385
throttle_s 0
created_at 2026-04-13T10:19:17.374512+00:00
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