Delete row sig_d6437db183f4 from signals

id sig_d6437db183f4
event_id evt_f8a5a7fb4532
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T10:10:47.500777+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:4c8109562cb71045
throttle_s 0
created_at 2026-04-20T10:10:47.500777+00:00
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