Delete row sig_107999f63bf0 from signals

id sig_107999f63bf0
event_id evt_12eb10e98633
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T18:07:20.874307+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:933fa1278df1b291
throttle_s 0
created_at 2026-04-07T18:07:20.874307+00:00
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