Delete row sig_9977ba74fe7a from signals

id sig_9977ba74fe7a
event_id evt_861123a5923e
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_068c6c98d ...
dedupe_key signal_enriched:news_delta:f6be9d834dcedbcc
throttle_s 0
created_at 2026-04-09T16:31:19.793710+00:00
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