Delete row sig_3cb174850bd5 from signals

id sig_3cb174850bd5
event_id evt_fa01c3f73997
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_919f52d60 ...
dedupe_key signal_enriched:market_headline_delta:73869d0d61b9 ...
throttle_s 0
created_at 2026-04-19T09:39:50.601688+00:00
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