Delete row sig_8f47f0c184e7 from signals

id sig_8f47f0c184e7
event_id evt_697c42d25525
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T03:06:50.598612+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:b18b66b40c83b3b2
throttle_s 0
created_at 2026-04-09T03:06:50.598612+00:00
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