Delete row sig_981923977d05 from signals

id sig_981923977d05
event_id evt_ab8a2ac84bc4
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-16T06:00:15.882281+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:09429212c88f891b
throttle_s 0
created_at 2026-04-16T06:00:15.882281+00:00
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