Delete row sig_84744370a4c2 from signals

id sig_84744370a4c2
event_id evt_1f0ea907f13b
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-19T08:08:51.176661+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:41f8eae067fc86d2
throttle_s 0
created_at 2026-04-19T08:08:51.176661+00:00
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