Delete row sig_b431a8d64195 from signals

id sig_b431a8d64195
event_id evt_be2959e4a3a8
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T23:36:07.258279+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:ae90e243418087bd
throttle_s 0
created_at 2026-04-19T23:36:07.258279+00:00
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