Delete row sig_5255fc550e1b from signals

id sig_5255fc550e1b
event_id evt_692a476d07de
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T12:46:57.182142+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:867d52a2f46c8e52
throttle_s 0
created_at 2026-04-07T12:46:57.182142+00:00
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