Delete row sig_c5787b08b257 from signals

id sig_c5787b08b257
event_id evt_b67ef7bc28f8
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_032d7a6ea ...
dedupe_key signal_enriched:news_delta:0ff2c961915b32e6
throttle_s 0
created_at 2026-04-17T09:00:15.489524+00:00
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