Delete row sig_774949ffc97f from signals

id sig_774949ffc97f
event_id evt_376b14b00d73
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_2bae63df8 ...
dedupe_key signal_enriched:market_headline_delta:33b0ad7b5ac5 ...
throttle_s 0
created_at 2026-04-19T09:01:04.878984+00:00
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