Delete row sig_ad777bef96df from signals

id sig_ad777bef96df
event_id evt_2e03b775baf0
watcher_id NULL
signal_type market_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {"_evidence_event_ids":["evt_522f30be6 ...
dedupe_key signal_enriched:market_headline_delta:408f759ce115 ...
throttle_s 0
created_at 2026-04-19T01:31:57.493858+00:00
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