Delete row sig_829457ef3537 from signals

id sig_829457ef3537
event_id evt_ebf3a900c172
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-12T12:08:55.467701+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:1835a4ff611f2168
throttle_s 0
created_at 2026-04-12T12:08:55.467701+00:00
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