Delete row sig_1d7a87807605 from signals

id sig_1d7a87807605
event_id evt_28eafaa9301b
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_c5a6d1590 ...
dedupe_key signal_enriched:news_delta:2aaaf13fd7d65951
throttle_s 0
created_at 2026-04-08T09:38:01.125988+00:00
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