Delete row sig_e670fe82e962 from signals

id sig_e670fe82e962
event_id evt_1636568e93cc
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-18T10:36:09.616948+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:b17d9bf78e297b9a
throttle_s 0
created_at 2026-04-18T10:36:09.616948+00:00
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