Delete row sig_3775299998ba from signals

id sig_3775299998ba
event_id evt_b9df929e508f
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_f5f442f2f ...
dedupe_key signal_enriched:market_headline_delta:e6204be8314b ...
throttle_s 0
created_at 2026-04-20T07:08:48.174109+00:00
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