Delete row sig_77f5a0e2e506 from signals

id sig_77f5a0e2e506
event_id evt_789a7e08787d
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_e4558da4a ...
dedupe_key signal_enriched:news_delta:8db0f5162fac6bf9
throttle_s 0
created_at 2026-04-19T12:39:39.690345+00:00
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