Delete row sig_d6f5e8ad7c81 from signals

id sig_d6f5e8ad7c81
event_id evt_ca8dbf54c4f3
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-09T22:33:31.157445+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:1773a22cdbe80619
throttle_s 0
created_at 2026-04-09T22:33:31.157445+00:00
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