Delete row sig_7c4d6e5bb47b from signals

id sig_7c4d6e5bb47b
event_id evt_3f560bd8b307
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-13T06:40:09.393908+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:ac25809f9adeba71
throttle_s 0
created_at 2026-04-13T06:40:09.393908+00:00
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