Delete row sig_1fa6e5808aab from signals

id sig_1fa6e5808aab
event_id evt_dfa4958d106e
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T07:40:04.253066+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:2324e208eb52821d
throttle_s 0
created_at 2026-04-20T07:40:04.253066+00:00
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