Delete row sig_0c8b7363beca from signals

id sig_0c8b7363beca
event_id evt_4f6088a8b4bc
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-20T10:32:38.353760+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:413858e85a8c04e7
throttle_s 0
created_at 2026-04-20T10:32:38.353760+00:00
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