Delete row sig_f979d182380d from signals

id sig_f979d182380d
event_id evt_41ec80753d72
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_08987dd02 ...
dedupe_key signal_enriched:market_headline_delta:3c0d8d2c2aeb ...
throttle_s 0
created_at 2026-04-20T02:28:45.004834+00:00
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